Advances in Space Research最新文献

{"title":"Investigating the effects of different data classification methods on landslide susceptibility mapping","authors":"Halil Akinci,&nbsp;Ayse Yavuz Ozalp","doi":"10.1016/j.asr.2024.12.020","DOIUrl":"10.1016/j.asr.2024.12.020","url":null,"abstract":"<div><div>In this study, landslide susceptibility maps (LSMs) were produced for three regions where landslides are common in the Eastern Black Sea Region of Türkiye. The regions studied include the districts of Trabzon, Rize and Artvin. The eXtreme Gradient Boosting (XGBoost) machine learning algorithm was used to generate the LSMs. Ten different factors that can affect landslides including lithology, land cover, topographic wetness index (TWI), plan and profile curvature, slope, elevation, aspect, distance to roads and drainages were used for the research. The study tested various spatial data classification methods for these factors. Specifically, the data was categorized using five distinct classification methods: “geometric interval,” “equal interval,” “manual interval,” “natural breaks,” and “quantile.” The main objective of the study was to see how these classification methods affect the accuracy of LSMs. For this purpose, six different models using the XGBoost algorithm were created. In the first model, continuous data was used for most of the factors, while some factors (aspect, land cover and lithology) were used as discrete data. The other five models categorized the data using the different classification methods mentioned above. The receiver operating characteristic (ROC) curve and area under the curve (AUC) approach were used to measure how well each model performed. The results showed that the Model_1 using mostly continuous data performed the best among all three study areas with the highest AUC value. The model with the lowest AUC value was the model using the equal interval classification method (Model_3). The most important finding gained from this study was that when producing LSMs, it is preferable to maintain continuous data as is rather than reclassifying it, as this improves the accuracy of the susceptibility model.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 4","pages":"Pages 3427-3450"},"PeriodicalIF":2.8,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Feasibility of orbital capture of near-earth asteroids based on the planar-circular restricted three-body problem","authors":"Yamaguchi Kohei ,&nbsp;Gu Xinbo ,&nbsp;Inamori Takaya ,&nbsp;Park Ji-Hyun ,&nbsp;Taguchi Masaya","doi":"10.1016/j.asr.2024.11.030","DOIUrl":"10.1016/j.asr.2024.11.030","url":null,"abstract":"<div><div>With the goal of efficiently extracting samples or even materials from the surface of an asteroid, this study proposed and investigated a method to change the velocity vector of a near-Earth asteroid and place it into an orbit where it is captured by the Earth’s gravitational field. The change in the orbit of an asteroid is not directly discussed in relation to the change in the velocity vector but is indirectly considered by the change in the Jacobi integral, which is the first integral of the circular-planar restricted three-body problem. In addition, the distribution of the smaller alignment index (SALI) is investigated to find a capture point where the asteroid is not put into a chaotic orbit. The proposed method is numerically demonstrated for fictional asteroid capture missions. The results show that several asteroids can be put into stable captured orbits. Additionally, we propose a method to optimize the value of the Jacobi integral, aiming to stabilize periodic captured orbits. Numerical integration confirms that when the Jacobi integral is optimized, the orbital lifetime of the captured orbit exceeds 500 years.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 4","pages":"Pages 3806-3819"},"PeriodicalIF":2.8,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Finite-horizon approximate optimal attitude control based on adaptive dynamic programming for ultra-low-orbit satellite","authors":"Jiahong Ma,&nbsp;Baolin Wu,&nbsp;Yunhai Geng,&nbsp;Menglei Wang","doi":"10.1016/j.asr.2024.11.073","DOIUrl":"10.1016/j.asr.2024.11.073","url":null,"abstract":"<div><div>This study investigates the finite-horizon approximate optimal attitude control problem for ultra-low-orbit satellites, addressing the complexities introduced by substantial disturbance, actuator faults, actuator saturation, and time constraint. Initially, a fixed-time concurrent learning fault and disturbance estimation approach is proposed that relieves persistent excitation constraints and isolates different influences individually. Subsequently, the cost function is designed with actuator fault estimation, ensuring that the control strategy consistently adheres to actuator saturation constraints and can compensate for current faults. Furthermore, based on the adaptive dynamic programming, an approximate optimal attitude control approach is proposed, which employs time-varying activation functions to approximate the optimal cost function. A fixed-time neural network weight adaptation strategy is designed to ensure the precision and reliability of the approximation. Finally, the numerical simulation confirms the validity and practical applicability of the proposed approach in satellite attitude control systems.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 4","pages":"Pages 3856-3869"},"PeriodicalIF":2.8,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An empirical model of the thermospheric winds based on ICON/MIGHTI observations","authors":"Rongjin Du ,&nbsp;Ruilong Zhang ,&nbsp;Libo Liu ,&nbsp;Wendong Liu ,&nbsp;Wenbo Li ,&nbsp;Yuyan Yang ,&nbsp;Han Ma ,&nbsp;Huijun Le ,&nbsp;Yiding Chen","doi":"10.1016/j.asr.2024.12.018","DOIUrl":"10.1016/j.asr.2024.12.018","url":null,"abstract":"<div><div>It is crucial to accurately reproduce the climatological features of the thermospheric neutral winds. We used the 2020–2022 data of the Michelson Interferometer for Global High-Resolution Thermospheric Imaging (MIGHTI) on the Ionospheric Connection Explorer (ICON) to develop an empirical model of thermospheric winds with the methods of the Non-Uniform Rational B-Spline and harmonic fittings (NURBS-Harmonic model). The NURBS-Harmonic model exhibits good adaptability for winds in every season with longitude, latitude, local time, and altitude. Over 70 % of the NURBS-Harmonic data are present with errors within 15 m/s, showing a better performance than the Horizontal Wind Model (HWM14). The percentage of HMW14 data errors within 15 m/s is about 40 %. The NURBS-Harmonic effectively captures the spatial structure of the wind fields and exhibits seasonal variations well. At 250 km, zonal winds in the low and middle latitudes at 12 LT exhibit a wavenumber-3 (WN3) structure in all the seasons, while they display a slight wavenumber-4 (WN4) longitude structure trend during June Solstice and September Equinox. Meridional winds at the same altitude show a distinct WN4 structure in every season. Different from the HWM14, which only includes migrating tides, the NURBS-Harmonic model also considers non-migrating tidal components. To validate the significance of non-migrating tides, we conducted a wave analysis on meridional winds at 250 km in September Equinox near the equator where non-migrating tides are relatively important. The analysis indicates that the amplitudes of the predominant non-migrating tidal components (SE2, DW2, and D0) are nearly equal and about 40 % of the dominant migrating tidal component DW1. This suggests that the non-migrating tidal components can contribute significantly to the overall wind field variability and should not be overlooked. In addition, the extensive height coverage from 91 km to 300 km of the MIGHTI data enables the model to provide precise altitude information. The zonal WN4 structure of zonal winds is most prominent in the altitude ranges of 100–250 km at low latitudes in the Northern Hemisphere during June Solstice and September Equinox. The model accurately reflects the phases variations of the winds at various altitudes. The phases of WN3 and WN4 at 110 km are opposite to those at 150 km, existing in all seasons. This may partially explain previous reports that the topside ionosphere equatorial vertical plasma drift is positively correlated with the zonal winds at 110 km and inversely correlated with those at 150 km.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 4","pages":"Pages 3730-3742"},"PeriodicalIF":2.8,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of equatorial plasma bubble irregularities under quiet and disturbed geomagnetic conditions over the East African longitudinal sector in 2015","authors":"Zerihun Alemu ,&nbsp;Tsegaye Kassa","doi":"10.1016/j.asr.2024.12.012","DOIUrl":"10.1016/j.asr.2024.12.012","url":null,"abstract":"<div><div>In this paper, we investigated the behavior of equatorial plasma bubble irregularities under quiet and disturbed geomagnetic conditions in the year 2015. Total Electron Content (TEC) data was obtained from four Global Navigation Satellite System (GNSS) receivers situated at Addis Ababa (ADIS), Bahir Dar (BDMT), ASAB (ASAB), and Debark (DEBK). We used Rate of TEC change index (ROTI) to describe ionospheric irregularities associated with plasma bubbles. The monthly occurrence rates (MOR) is obtained to be higher in equinoctial and lower in solstitial months at all stations. Moreover, the seasonal occurrence rates of plasma bubbles (SOR) show equinoctial and solstitial asymmetries. The seasonal occurrence rate in March equinox is higher than that of the September equinox during both quiet and disturbed geomagnetic conditions. Similarly, higher occurrence rate is observed in June than December solstice in quiet geomagnetic conditions. We have also investigated that the occurrence rate of plasma bubble is higher in geomagnetic quiet conditions than disturbed conditions at all stations. Moreover, there is also excellent correlation with high degree of significance between the monthly occurrence rates of plasma bubbles and the monthly mean F10.7 index and sunspot number at all stations. The occurrence times of plasma bubbles are almost similar in the four stations and most of the irregularities (around 95 <span><math><mrow><mo>%</mo></mrow></math></span>of the total irregularities) are observed in times between postsunset and midnight hours. The daily, monthly, and seasonal variations of ROTI also demonstrate similarity with the variation of the occurrence rates of plasma bubbles.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 4","pages":"Pages 3671-3691"},"PeriodicalIF":2.8,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The path-tracing simulation of light-field camera system: SurfCam/GrainCams for lunar surface exploration","authors":"Minbae Kim ,&nbsp;Minsup Jeong ,&nbsp;Mingyeong Lee ,&nbsp;Jihun Kim ,&nbsp;Young-Jun Choi ,&nbsp;Sungsoo S. Kim ,&nbsp;Hae-Gon Jeon ,&nbsp;Jisu Shin","doi":"10.1016/j.asr.2024.12.029","DOIUrl":"10.1016/j.asr.2024.12.029","url":null,"abstract":"<div><div>The SurfCam is being developed to understand the microscopic lunar surface structures known as the fairy castle structure, composed of grains with an average size of a few tens of microns. It is designed as a microscopic light-field camera (LFC) and is one of the camera instrument packages in GrainCams, a candidate payload for NASA’s Commercial Lunar Payload Services (NASA/CLPS). The light-field camera system allows for obtaining depth maps and 3D images of lunar surface structures on a scale of tens of microns by capturing a 4D light field. This camera system can be achieved by adding a microlens array (MLA) between the main optics and the sensor in a typical camera system. The Cycles render engine, a physically-based path-tracing (one of the ray-tracing types) renderer of Blender 3D software, helps to simulate realistic light-field images. We performed path-tracing simulations by configuring SurfCam’s optics and creating test objects to confirm depth estimation results in Blender 3D. In this study, we present the results of simulated images and analyze them based on the current design of the SurfCam.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 4","pages":"Pages 4050-4060"},"PeriodicalIF":2.8,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modified Alfvén waves of multi-ion species in the upper ionosphere of Mars","authors":"A.A. Bakr ,&nbsp;W.M. Moslem ,&nbsp;M. El-Metwally ,&nbsp;I.S. Elkamash","doi":"10.1016/j.asr.2024.12.015","DOIUrl":"10.1016/j.asr.2024.12.015","url":null,"abstract":"<div><div>Cold-modified Alfvén waves of multi-ion species propagating perpendicular to an ambient magnetic field have been investigated. We derive the linear dispersion relation for any number of species. In addition to the conduction current density, we consider the displacement current density. The derived dispersion relation suggests a magnetized plasma mode to propagate at the long-wavelength for every ion species. At the short-wavelength, the propagating mode for every ion species saturates at a resonance frequency equal to the cyclotron frequency of that ion. The Alfvén wave mode is shown to be the long-wavelength mode for the heaviest ion species, while the Whistler wave mode corresponds to the less massive ion species. It is found that the displacement current density excites another mode to exist in the electron fluid, which is known as the magnetized plasma analog of Langmuir mode. The consequences of varying the magnetic field, and the total plasma density and the mixing ratios of the ion species on the resonance, the cutoff frequencies, and the propagating modes are inspected. Investigation of this model on the observed linear ULF waves on the upper ionosphere of Mars is introduced.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 4","pages":"Pages 4099-4125"},"PeriodicalIF":2.8,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization of low-earth orbit density model based on support vector regression","authors":"Yao Wu,&nbsp;Junyu Chen,&nbsp;Chusen Lin,&nbsp;Zijie Li","doi":"10.1016/j.asr.2024.11.062","DOIUrl":"10.1016/j.asr.2024.11.062","url":null,"abstract":"<div><div>With the increasing number of satellites being launched and the accumulation of space debris, the atmospheric density in low Earth orbit is becoming increasingly important for precise orbit determination. This study aims to optimize the accuracy of atmospheric density prediction in low Earth orbit using support vector regression (SVR). The SVR-based model uses high-resolution geomagnetic data and CHAMP satellite observation data to optimize the density of JB2008. Tests were conducted under various solar activity conditions and different periods. The results show that SVR improves the RMSE of the original model, the improvement rate of RMSE is between 10 % and 40 % and directly reduce MAPE to 2 %∼25 %.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 4","pages":"Pages 3601-3613"},"PeriodicalIF":2.8,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Neural network model for predicting the horizontal component of Earth’s magnetic field (H) over Indian equatorial region during quiet and disturbed periods","authors":"S. Sajith Babu ,&nbsp;K. Unnikrishnan ,&nbsp;Sreekumar Haridas","doi":"10.1016/j.asr.2024.12.014","DOIUrl":"10.1016/j.asr.2024.12.014","url":null,"abstract":"<div><div>Artificial Neural Networks (ANNs) have proven successful in forecasting various magnetospheric and ionospheric parameters. The design of an artificial neural network (ANN) for predicting the horizontal component of Earth’s magnetic field (H) and range in H (ΔH), over Indian equatorial region, for both quiet and disturbed conditions of 23^rd solar cycle (August 1996 to December 2007) is discussed in this work. Ground magnetometer data from the stations Tirunelveli [TIR], Pondicherry [PND], Alibag [ABG], and Ujjain [UJJ] are used for training the network. Datasets from the stations Trivandrum [TRD] and Nagpur [NGP] are used for the testing procedure. The data used in this work covers the 23^rd solar cycle and it include low, moderate and high solar activity levels of both the ascending and descending phases of the solar cycle. Two sets of input parameters are used as inputs to the ANN. The first set, namely the geophysical parameters, are temporally or spatially related to the training stations. These consists of Latitude, Longitude, day of the year (DOY), local time (LT) magnetic dip angle (Inclination, I) and angle of declination (magnetic declination, D). The second set of inputs, that are driven by solar activity and affect the different stations uniformly, are Solar Flux (F10.7), Ap Index, IMF Bz, and Ion Number Density. Using these input parameters a neural network model (CCNRM) with 10 hidden neurons and 600 iterations is developed. It is found that the prediction accuracy of the model is better while training with original time series rather than the detrended time series. Here we present the prediction of H and ΔH during the quiet, disturbed geomagnetic conditions (minor storms (Dst minimum ≤ −50 nT), major storms (Dst minimum ≤ −100 nT)) along with its seasonal variation. Different datasets of the 23^rd solar cycle including low, moderate and high solar activity levels from both the ascending and descending phases of the solar cycle are faithfully reproduced by the model. The model successfully predicted the diurnal variation, seasonal variation, minor storms and major storms within the average error limits of 11 nT, 7 nT, 27 nT and 36 nT respectively during the testing process.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 4","pages":"Pages 3705-3729"},"PeriodicalIF":2.8,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Real-time critical safety curve and predictive control based trajectory planning for complex shaped rotating spacecraft proximity","authors":"Jingxian Wang,&nbsp;Zhijun Chen,&nbsp;Rong Chen,&nbsp;Yong Zhao,&nbsp;Yuzhu Bai","doi":"10.1016/j.asr.2024.12.025","DOIUrl":"10.1016/j.asr.2024.12.025","url":null,"abstract":"<div><div>This paper presents a real-time trajectory planning and tracking control framework for a complex-shaped chaser to approach a rotating target with complex shapes. The framework is divided into two layers: trajectory planning and tracking control. Firstly, considering the complex shapes and relative attitude constraints of the target and chaser, a real-time critical safety curve (RT-CSC) is proposed as a collision avoidance constraint combined with the rotational motion of the target. Secondly, the multi-constraint improved disturbed fluid method (MCIDFM) is proposed. The flow field velocity is designed by considering proximity time optimization under boundary and chaser thruster performance constraints. Trajectory planning is achieved by making the flow field bypass the non-convex keep-out zone formed by the RT-CSC. Then, the tracking control is implemented using a model predictive control method and the closed-loop asymptotic stability is demonstrated. Simulation results demonstrate the proposed methods’ smoothness, safety, and strong approach capabilities. Rapidity and robustness are also reflected in simulation analysis.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 4","pages":"Pages 3891-3913"},"PeriodicalIF":2.8,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}