Journal of Astronomy and Space Sciences最新文献_第2页

Polar Mesospheric Summer Echo Characteristics in Magnetic Local Time and Height Profiles 磁地方时和高度剖面的极地中间层夏季回波特征

Journal of Astronomy and Space Sciences Pub Date : 2023-09-01 DOI: 10.5140/jass.2023.40.3.101

Young-Sook Lee, Ram Singh, Geonhwa Jee, Young-Sil Kwak, Yong Ha Kim

{"title":"Polar Mesospheric Summer Echo Characteristics in Magnetic Local Time and Height Profiles","authors":"Young-Sook Lee, Ram Singh, Geonhwa Jee, Young-Sil Kwak, Yong Ha Kim","doi":"10.5140/jass.2023.40.3.101","DOIUrl":"https://doi.org/10.5140/jass.2023.40.3.101","url":null,"abstract":"We conducted a statistical study of polar mesospheric summer echoes (PMSEs) in relation to magnetic local time (MLT), considering the geomagnetic conditions using the K-index (or K). Additionally, we performed a case study to examine the velocity profile, specifically for high velocities (≥ ~100 m/s) varying with high temporal resolution at high K-index values. This study utilized the PMSE data obtained from the mesosphere–stratosphere–troposphere radar located in Esrange, Sweden (63.7°N, 21°E). The change in K-index in terms of MLT was high (K ≥ 4) from 23 to 04 MLT, estimated for the time PMSE was present. During the near-midnight period (0–4 MLT), both PMSE occurrence and signal-to-noise ratio (SNR) displayed an asymmetric structure with upper curves for K ≥ 3 and lower curves for K < 3. Furthermore, the occurrence of high velocities peaked at 3–4 MLT for K ≥ 3. From case studies focusing on the 0–3 MLT period, we observed persistent eastward-biased high velocities (≥ 200 m/s) prevailing for ~18 min. These high velocities were accompanied with the systematic motion of profiles at 85–88 km, including large shear formation. Importantly, the rapid variations observed in velocity could not be attributed to neutral wind effects. The present findings suggest a strong substorm influence on PMSE, especially in the midnight and early dawn sectors. The large zonal drift observed in PMSE were potentially energized by local electromagnetic fields or the global convection field induced by the electron precipitation during substorms.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135349564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Post Trajectory Insertion Performance Analysis of Korea Pathfinder Lunar Orbiter Using SpaceX Falcon 9 使用SpaceX猎鹰9号的韩国探路者月球轨道器后轨道插入性能分析

Journal of Astronomy and Space Sciences Pub Date : 2023-09-01 DOI: 10.5140/jass.2023.40.3.123

Young-Joo Song, Jonghee Bae, SeungBum Hong, Jun Bang, Donghun Lee

{"title":"Post Trajectory Insertion Performance Analysis of Korea Pathfinder Lunar Orbiter Using SpaceX Falcon 9","authors":"Young-Joo Song, Jonghee Bae, SeungBum Hong, Jun Bang, Donghun Lee","doi":"10.5140/jass.2023.40.3.123","DOIUrl":"https://doi.org/10.5140/jass.2023.40.3.123","url":null,"abstract":"This paper presents an analysis of the trans-lunar trajectory insertion performance of the Korea Pathfinder Lunar Orbiter (KPLO), the first lunar exploration spacecraft of the Republic of Korea. The successful launch conducted on August 4, 2022 (UTC), utilized the SpaceX Falcon 9 rocket from Cape Canaveral Space Force Station. The trans-lunar trajectory insertion performance plays a crucial role in ensuring the overall mission success by directly influencing the spacecraft’s onboard fuel consumption. Following separation from the launch vehicle (LV), a comprehensive analysis of the trajectory insertion performance was performed by the KPLO flight dynamics (FD) team. Both orbit parameter message (OPM) and orbit determination (OD) solutions were employed using deep space network (DSN) tracking measurements. As a result, the KPLO was accurately inserted into the ballistic lunar transfer (BLT) trajectory, satisfying all separation requirements at the target interface point (TIP), including launch injection energy per unit mass (C3), right ascension of the injection orbit apoapsis vector (RAV), and declination of the injection orbit apoapsis vector (DAV). The precise BLT trajectory insertion facilitated the smoother operation of the KPLO’s remainder mission phase and enabled the utilization of reserved fuel, consequently significantly enhancing the possibilities of an extended mission.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135349563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Uncertainty Quantification of Thermophysical Property Measurement in Space and on Earth: A Study of Liquid Platinum Using Electrostatic Levitation 空间和地球热物性测量的不确定度量化:利用静电悬浮对液态铂的研究

Journal of Astronomy and Space Sciences Pub Date : 2023-09-01 DOI: 10.5140/jass.2023.40.3.93

Jannatun Nawer, Takehiko Ishikawa, Hirohisa Oda, Chihiro Koyama, Douglas M. Matson

引用次数: 0

Response to the Comment by Chandra S on “Interaction of Ion Cyclotron Electromagnetic Wave with Energetic Particles in the Existence of Alternating Electric (AC) Field Using Ring Distribution” 对Chandra S关于“在交变电场存在下离子回旋加速器电磁波与高能粒子相互作用的环形分布”评论的回应

IF 0.5

Journal of Astronomy and Space Sciences Pub Date : 2023-06-01 DOI: 10.5140/jass.2023.40.2.91

K. N. Shukla, J. Kumari, R. S. Pandey

引用次数: 0

Titius-Bode’s Relation in Exoplanetary Systems 系外行星系统中的提丢斯-波德关系

IF 0.5

Journal of Astronomy and Space Sciences Pub Date : 2023-06-01 DOI: 10.5140/jass.2023.40.2.67

Heon-Young Chang

{"title":"Titius-Bode’s Relation in Exoplanetary Systems","authors":"Heon-Young Chang","doi":"10.5140/jass.2023.40.2.67","DOIUrl":"https://doi.org/10.5140/jass.2023.40.2.67","url":null,"abstract":"\u0000 The Titius-Bode’s relation has been historically successful in predicting\u0000 the location of Ceres in the solar system, while its physical basis remains\u0000 hidden. In this study, we attempt to answer the question of whether the\u0000 Titius-Bode’s relation is universally valid for exoplanetary systems with\u0000 plural exoplanets. For this purpose, we statistically study the distribution of\u0000 the ratio of the orbiting periods of two planets in 32 exoplanetary systems\u0000 hosted by a single star. We only consider the period ratios derived from\u0000 exoplanets orbiting a single star since celestial objects under investigation\u0000 are kept as simple as possible and free from uncertainties such as the mass of\u0000 the host star. We find that the distribution of period ratios of two exoplanets\u0000 appears inconsistent with that derived from the Titius-Bode’s relation\u0000 using the χ2 test. We also found that the\u0000 distance distribution in exoplanetary systems unlikely follows the uniform\u0000 distribution or the Poisson’s distribution. It is noted, however, that\u0000 more rigorous statistical tests should be carried out to reach a more certain\u0000 conclusion.\u0000","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74158938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Solar Flux Effects on the Variations of Equatorial Electrojet (EEJ) and Counter-Electrojet (CEJ) Current across the Different Longitudinal Sectors during Low and High Solar Activity 太阳通量对低、高太阳活动期间赤道电喷流(EEJ)和反电喷流(CEJ)在不同纵向扇区上变化的影响

IF 0.5

Journal of Astronomy and Space Sciences Pub Date : 2023-06-01 DOI: 10.5140/jass.2023.40.2.45

A. Cherkos

{"title":"Solar Flux Effects on the Variations of Equatorial Electrojet (EEJ)\u0000 and Counter-Electrojet (CEJ) Current across the Different Longitudinal Sectors\u0000 during Low and High Solar Activity","authors":"A. Cherkos","doi":"10.5140/jass.2023.40.2.45","DOIUrl":"https://doi.org/10.5140/jass.2023.40.2.45","url":null,"abstract":"\u0000 \u0000 This study examined the effect of solar flux (F10.7) and sunspots number (R) on\u0000 the daily variation of equatorial electrojet (EEJ) and morning/afternoon counter\u0000 electrojet (MCEJ/ACEJ) in the ionospheric E region across the eight longitudinal\u0000 sectors during quiet days from January 2008 to December 2013. In particular, we\u0000 focus on both minimum and maximum solar cycle of 24. For this purpose, we have\u0000 collected a 6-year ground-based magnetic data from multiple stations to\u0000 investigate EEJ/CEJ climatology in the Peruvian, Brazilian, West & East\u0000 African, Indian, Southeast Asian, Philippine, and Pacific sectors with the\u0000 corresponding F10.7 and R data from satellites simultaneously. Our results\u0000 reveal that the variations of monthly mean EEJ intensities were consistent with\u0000 the variations of solar flux and sunspot number patterns of a cycle, further\u0000 indicating that there is a significant seasonal and longitudinal dependence.\u0000 During the high solar cycle period, F10.7 and R have shown a strong peak around\u0000 equinoctial months, consequently, the strong daytime EEJs occurred in the\u0000 Peruvian and Southeast Asian sectors followed by the Philippine regions\u0000 throughout the years investigated. In those sectors, the correlation between the\u0000 day Maxima EEJ and F10.7 strengths have a positive value during periods of high\u0000 solar activity, and they have relatively higher values than the other sectors. A\u0000 predominance of MCEJ occurrences is observed in the Brazilian (TTB), East\u0000 African (AAE), and Peruvian (HUA) sectors. We have also observed the CEJ\u0000 dependence on solar flux with an anti-correlation between ACEJ events and F10.7\u0000 are observed especially during a high solar cycle period.\u0000","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74606598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comment on “Interaction of Ion Cyclotron Electromagnetic Wave with Energetic Particles in the Existence of Alternating Electric Field Using Ring Distribution” by Shukla KN, Kumari J, Pandey RS Shukla KN, Kumari J, Pandey RS对“交变电场存在下离子回旋电磁波与高能粒子的环形相互作用”的评论

IF 0.5

Journal of Astronomy and Space Sciences Pub Date : 2023-06-01 DOI: 10.5140/jass.2023.40.2.89

S. Chandra

{"title":"Comment on “Interaction of Ion Cyclotron Electromagnetic Wave\u0000 with Energetic Particles in the Existence of Alternating Electric Field Using\u0000 Ring Distribution” by Shukla KN, Kumari J, Pandey RS","authors":"S. Chandra","doi":"10.5140/jass.2023.40.2.89","DOIUrl":"https://doi.org/10.5140/jass.2023.40.2.89","url":null,"abstract":"It is already discussed categorically and in detail that for the alternating current (AC) electric field parallel to the magnetic field, the dispersion relation is too complicated and cannot be expressed through a simple expression. As they claim to use a simple relation, which cannot be applicable, the results of Shukla et al. (2022) are not reliable. Propagation of waves through a magnetized plasma having AC electric field has been discussed in detail in literature. For propagation of waves in plasma, the dielectric tensor is expressed by Summers et al. (1994), where εij are (nine) elements of dielectric tensor ε, and the wavevector is k = k⊥i ^ + kǁ k ^ , where i ^ and k ^ are, respectively, unit vector along the x-axis and z-axis of Cartesian coordinate system. Let us review our earlier work in brief. We have investigated two cases: (i) the magnetic field is perpendicular to the AC electric field (Chandra & Sharma 2020a), and (ii) the magnetic field is parallel to the AC electric field (Chandra & Sharma 2020b). Chandra & Sharma (2020a) considered the case of AC electric field E0 = E0 sin νt i ^ , and ambient magnetic field B = B0k ^ , i.e., the direction of the electric field is perpendicular to the direction of the magnetic field. For the propagation of wave parallel to the magnetic filed (i.e., along the z-axis), we have k⊥ = 0, kǁ = k, N⊥ = 0 and Nǁ = N. Therefore, ε13 = ε31 = ε23 = ε32 = 0, so that, we have","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84202265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Lessons Learned from Korea Pathfinder Lunar Orbiter Flight Dynamics Operations: NASA Deep Space Network Interfaces and Support Levels 从韩国探路者月球轨道飞行器飞行动力学操作中吸取的教训:NASA深空网络接口和支持水平

IF 0.5

Journal of Astronomy and Space Sciences Pub Date : 2023-06-01 DOI: 10.5140/jass.2023.40.2.79

Young-Joo Song, Seung-Su Hong, Dong-Gyu Kim, Jun Bang, Jonghee Bae

{"title":"Lessons Learned from Korea Pathfinder Lunar Orbiter Flight Dynamics\u0000 Operations: NASA Deep Space Network Interfaces and Support\u0000 Levels","authors":"Young-Joo Song, Seung-Su Hong, Dong-Gyu Kim, Jun Bang, Jonghee Bae","doi":"10.5140/jass.2023.40.2.79","DOIUrl":"https://doi.org/10.5140/jass.2023.40.2.79","url":null,"abstract":"\u0000 On Aug. 4, 2022, at 23:08:48 (UTC), the Korea Pathfinder Lunar Orbiter (KPLO),\u0000 also known as Danuri, was launched using a SpaceX Falcon 9 launch vehicle.\u0000 Currently, KPLO is successfully conducting its science mission around the Moon.\u0000 The National Aeronautics and Space Administration (NASA)’s Deep Space\u0000 Network (DSN) was utilized for the successful flight operation of KPLO. A great\u0000 deal of joint effort was made between the Korea Aerospace Research Institute\u0000 (KARI) and NASA DSN team since the beginning of KPLO ground system design for\u0000 the success of the mission. The efficient utilization and management of NASA DSN\u0000 in deep space exploration are critical not only for the spacecraft’s\u0000 telemetry and command but also for tracking the flight dynamics (FD) operation.\u0000 In this work, the top-level DSN interface architecture, detailed workflows, DSN\u0000 support levels, and practical lessons learned from the joint team’s\u0000 efforts are presented for KPLO’s successful FD operation. Due to the\u0000 significant joint team’s efforts, KPLO is currently performing its\u0000 mission smoothly in the lunar mission orbit. Through KPLO cooperative operation\u0000 experience with DSN, a more reliable and efficient partnership is expected not\u0000 only for Korea’s own deep space exploration mission but also for the\u0000 KARI-NASA DSN joint support on other deep space missions in the future.\u0000","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82505361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Comparative Analysis of Cosmic Radiation Exposure Dose Due to the Russian Detour Route 俄罗斯绕行路线的宇宙辐射照射剂量比较分析

IF 0.5

Journal of Astronomy and Space Sciences Pub Date : 2023-06-01 DOI: 10.5140/jass.2023.40.2.59

Hee-Bok Ahn, Jaeyoung Kwak, Jung-Lae Hwang

引用次数: 0

Observations for the Ionosphere Using European Incoherent Scatter (EISCAT) in the Dayside Polar Cap/Cusp and Auroral Region 利用欧洲非相干散射(EISCAT)在日侧极帽/尖和极光区观测电离层

IF 0.5

Journal of Astronomy and Space Sciences Pub Date : 2023-03-01 DOI: 10.5140/jass.2023.40.1.1

G. Jee, E. Ji, Eunsol Kim, Y. Kwak, Changsup Lee, H. Kwon, Ji-Eun Kim, Young-bae Ham, Ji-Hee Lee, Jeong‐Han Kim, Tae-Yong Yang, H. Kam

{"title":"Observations for the Ionosphere Using European Incoherent Scatter (EISCAT) in the\u0000 Dayside Polar Cap/Cusp and Auroral Region","authors":"G. Jee, E. Ji, Eunsol Kim, Y. Kwak, Changsup Lee, H. Kwon, Ji-Eun Kim, Young-bae Ham, Ji-Hee Lee, Jeong‐Han Kim, Tae-Yong Yang, H. Kam","doi":"10.5140/jass.2023.40.1.1","DOIUrl":"https://doi.org/10.5140/jass.2023.40.1.1","url":null,"abstract":"Korea Polar Research Institute (KOPRI) and Korea Astronomy and Space Institute\u0000 (KASI) have been participating in the European Incoherent Scatter (EISCAT) Scientific\u0000 Association as an affiliate institution in order to observe the polar ionosphere since\u0000 2015. During the period of December 16–21, 2016 and January 3–9, 2018, the observations\u0000 for the polar ionospheric parameters such as the electron density profiles, ion drift,\u0000 and electron/ion temperature are carried out in the polar cap/cusp region by the EISCAT\u0000 Svalbard radar (ESR). The purpose of the observations is to investigate the\u0000 characteristic of the winter ionosphere in the dayside polar cap/cusp region. In this\u0000 paper, we briefly report the results of the ESR observations for winter daytime\u0000 ionosphere and also the simultaneous observations for the ionosphere-thermosphere system\u0000 together with the balloon-borne instrument High-Altitude Interferometer WIND Experiment\u0000 (HIWIND) performed by the High Altitude Observatory (HAO), National Center for\u0000 Atmospheric Research (NCAR). We further introduce our research activities using\u0000 long-term EISCAT observations for the occurrence of ion upflow and the climatology of\u0000 the polar ionospheric density profiles in comparison with the mid-latitude ionosphere.\u0000 Finally, our future research plans will briefly be introduced.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85276540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0