Frontiers in Astronomy and Space Sciences最新文献_第10页

Corrigendum: Co-adaptation of Streptococcus mutans to simulated microgravity and silver nitrate 勘误:变形链球菌对模拟微重力和硝酸银的共同适应

3区物理与天体物理

Frontiers in Astronomy and Space Sciences Pub Date : 2023-08-15 DOI: 10.3389/fspas.2023.1274148

Mizpha C. Fernander, Kelyah Spurgeon, Jada Graves, Wynter Guess, Jordan Miller, Chanell Mangum, Joseph L. Graves, Misty D. Thomas

{"title":"Corrigendum: Co-adaptation of Streptococcus mutans to simulated microgravity and silver nitrate","authors":"Mizpha C. Fernander, Kelyah Spurgeon, Jada Graves, Wynter Guess, Jordan Miller, Chanell Mangum, Joseph L. Graves, Misty D. Thomas","doi":"10.3389/fspas.2023.1274148","DOIUrl":"https://doi.org/10.3389/fspas.2023.1274148","url":null,"abstract":"• please read through all the templates before choosing • pick the most relevant text template(s) from the following page and delete all others.• edit the text as necessary, ensuring that the original incorrect text is included for the record, please see the below. • please do not use any extra formatting when editing the templates, and only modify the red text unless absolutely necessary • submit to Frontiers following the instructions on this page.When the original text contained incorrect information, to preserve the scientific record, please include that text when editing the below templates. For example:There was a mistake in the Funding statement, an incorrect number was used. The correct number is \"2015C03Bd051.\". The publisher apologizes for this mistake.The original version of this article has been updated.In the published article, there was a mistake in the Funding statement. The funding statement for the Key Development Project of the Department of Science and Technology was displayed as \"2015CBd051\". The correct statement is \"Key Development Project of Department of Science and Technology (2015C03Bd051).'' Template continues on the next page ","PeriodicalId":46793,"journal":{"name":"Frontiers in Astronomy and Space Sciences","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135114525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Using machine learning to characterize solar wind driving of convection in the terrestrial magnetotail lobes 利用机器学习表征太阳风对地球磁尾叶对流的驱动

IF 3 3区物理与天体物理

Frontiers in Astronomy and Space Sciences Pub Date : 2023-08-14 DOI: 10.3389/fspas.2023.1180410

Xin Cao, J. Halekas, S. Haaland, S. Ruhunusiri, K. Glassmeier

{"title":"Using machine learning to characterize solar wind driving of convection in the terrestrial magnetotail lobes","authors":"Xin Cao, J. Halekas, S. Haaland, S. Ruhunusiri, K. Glassmeier","doi":"10.3389/fspas.2023.1180410","DOIUrl":"https://doi.org/10.3389/fspas.2023.1180410","url":null,"abstract":"In order to quantitatively investigate the mechanism of how magnetospheric convection is driven in the region of magnetotail lobes on a global scale, we analyzed data from the ARTEMIS spacecraft in the deep tail and data from the Cluster spacecraft in the near and mid-tail regions. Our previous work revealed that, in the lobes near the Moon’s orbit, the convection can be estimated by using ARTEMIS measurements of lunar ions’ velocity. Based on that, in this paper, we applied machine learning models to these measurements to determine which upstream solar wind parameters significantly drive the lobe convection in magnetotail regions, to help us understand the mechanism that controls the dynamics of the tail lobes. The results demonstrate that the correlations between the predicted and measured convection velocities for the machine learning models (>0.75) are superior to those of the multiple linear regression model (∼0.23–0.43) in the testing dataset. The systematic analysis shows that the IMF and magnetospheric activity play an important role in influencing plasma convection in the global magnetotail lobes.","PeriodicalId":46793,"journal":{"name":"Frontiers in Astronomy and Space Sciences","volume":" ","pages":""},"PeriodicalIF":3.0,"publicationDate":"2023-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47286469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Radio emissions of auroral origin observable at ground level: outstanding problems 在地面观测到的极光源射电辐射:突出问题

IF 3 3区物理与天体物理

Frontiers in Astronomy and Space Sciences Pub Date : 2023-08-11 DOI: 10.3389/fspas.2023.1195654

J. Labelle

引用次数: 0

Efficient galaxy classification through pretraining 通过预训练进行有效的星系分类

IF 3 3区物理与天体物理

Frontiers in Astronomy and Space Sciences Pub Date : 2023-08-10 DOI: 10.3389/fspas.2023.1197358

Jesse Schneider, D. Stenning, L. Elliott

引用次数: 0

Signature of Y-forking in ionogram traces observed at low-mid latitude Indian station, New Delhi, during the earthquake events of 2020: ionosonde observations 2020年地震期间在新德里中低纬度印度站观测到的电离层图轨迹中Y分叉的特征：电离层观测

IF 3 3区物理与天体物理

Frontiers in Astronomy and Space Sciences Pub Date : 2023-08-09 DOI: 10.3389/fspas.2023.1170288

Arti Bhardwaj, Ankit Gupta, Qadeer Ahmed, Anshul Singh, Sumedha Gupta, S. Sarkhel, M. V. Sunil Krishna, D. Pallamraju, T. Pant, A. K. Upadhayaya

{"title":"Signature of Y-forking in ionogram traces observed at low-mid latitude Indian station, New Delhi, during the earthquake events of 2020: ionosonde observations","authors":"Arti Bhardwaj, Ankit Gupta, Qadeer Ahmed, Anshul Singh, Sumedha Gupta, S. Sarkhel, M. V. Sunil Krishna, D. Pallamraju, T. Pant, A. K. Upadhayaya","doi":"10.3389/fspas.2023.1170288","DOIUrl":"https://doi.org/10.3389/fspas.2023.1170288","url":null,"abstract":"We have examined ionospheric response to eleven earthquake events measuring less than four on the Richter scale during the year 2020 that occurred in the vicinity of New Delhi (28.6°N, 77.2°E, 42.4°N dip). We have used ionogram traces, manually scaled critical ionospheric layer parameters using SAO explorer obtained from Digisonde along with the O(1D) airglow observations from a multi-wavelength all-sky airglow imager installed at Hanle, Ladakh, India (32.7°N, 78.9°E, 24.1°N dip). Perceptible ionospheric perturbations 2–9 days prior to these earthquake events resulting in more than 250% variation in electron density are observed. We found distortion of ionogram trace in the form of Y forking majorly at New Delhi on the precursor day and after the earthquake event. Traces of Y forked ionograms were also observed at Ahmedabad (23°N, 72°E, 15°N dip) and Trivandrum (8.5°N, 76.9°E, 0.5°N dip). These Y-forked ionograms are one of the first observations during any earthquake events and are looked at as a signature of Travelling Ionospheric Disturbances (TIDs).","PeriodicalId":46793,"journal":{"name":"Frontiers in Astronomy and Space Sciences","volume":" ","pages":""},"PeriodicalIF":3.0,"publicationDate":"2023-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49451228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Heliospheric 3-D MHD ENLIL simulations of multi-CME and multi-spacecraft events 多CME和多航天器事件的太阳层三维MHD ENLIL模拟

IF 3 3区物理与天体物理

Frontiers in Astronomy and Space Sciences Pub Date : 2023-08-08 DOI: 10.3389/fspas.2023.1226992

D. Odstrcil

{"title":"Heliospheric 3-D MHD ENLIL simulations of multi-CME and multi-spacecraft events","authors":"D. Odstrcil","doi":"10.3389/fspas.2023.1226992","DOIUrl":"https://doi.org/10.3389/fspas.2023.1226992","url":null,"abstract":"Interpreting multi-spacecraft heliospheric observations of the evolving solar wind (SW) streams with propagating and interacting coronal mass ejections (CMEs) is challenging. Numerical simulations can provide global context and suggest what may and may not be observed. The heliospheric three-dimensional (3D) magnetohydrodynamic (MHD) ENLIL model can provide a near-real-time prediction of heliospheric space weather, and it is used at NASA Community Coordinated Modeling Center (CCMC), NOAA Space Weather Prediction Center (SWPC), and UK Meteorological Office (MetOffice). However, this version does not show its full potential, especially in the case of multi-CME events observed by various spacecraft. We describe tools developed to interpret remote observations and in-situ measurements better and apply them to multi-CME events observed by ACE, STEREO-A, Parker Solar Probe (PSP), BepiColombo, and Solar Orbiter. We present some results on 1) global structures of the SW speed and density at the ecliptic, 2) the evolution of SW parameters at the spacecraft, 3) magnetic field connectivity at the spacecraft, 4) automatic detection of shock parameters and alert plots, and 5) synthetic white-light (WL) imaging. This paper is not on model initialization or analyzing specific CME events, but it describes features not used at space weather prediction centers and provided by NASA/CCMC Run-On-Request service. This paper advertises new tools and shows their benefits when applied to selected heliospheric space weather events observed at near-Earth, PSP, Solar Orbiter, and STEREO-A spacecraft.","PeriodicalId":46793,"journal":{"name":"Frontiers in Astronomy and Space Sciences","volume":" ","pages":""},"PeriodicalIF":3.0,"publicationDate":"2023-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41724899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Drift phase resolved diffusive radiation belt model: 2. implementation in a case of random electric potential fluctuations 漂移相分辨扩散辐射带模型：2。电势随机波动情况下的实现

IF 3 3区物理与天体物理

Frontiers in Astronomy and Space Sciences Pub Date : 2023-08-08 DOI: 10.3389/fspas.2023.1232512

S. Lejosne, J. Albert, S. Walton

{"title":"Drift phase resolved diffusive radiation belt model: 2. implementation in a case of random electric potential fluctuations","authors":"S. Lejosne, J. Albert, S. Walton","doi":"10.3389/fspas.2023.1232512","DOIUrl":"https://doi.org/10.3389/fspas.2023.1232512","url":null,"abstract":"In the first part of this work, we highlighted a drift-diffusion equation capable of resolving the magnetic local time dimension when describing the effects of trapped particle transport on radiation belt intensity. Here, we implement these general considerations in a special case. Specifically, we determine the various transport and diffusion coefficients required to solve the drift-diffusion equation for equatorial electrons drifting in a dipole magnetic field in the presence of a specific model of time-varying electric fields. Random electric potential fluctuations, described as white noise, drive fluctuations of trapped particle drift motion. We also run a numerical experiment that consists of tracking trapped particles’ drift motion. We use the results to illustrate the validity of the drift-diffusion equation by showing agreement in the solutions. Our findings depict how a structure initially localized in magnetic local time generates drift-periodic signatures that progressively dampen with time due to the combined effects of radial and azimuthal diffusions. In other words, we model the transition from a drift-dominated regime, to a diffusion-dominated regime. We also demonstrate that the drift-diffusion equation is equivalent to a standard radial diffusion equation once the distribution function is phase-mixed. The drift-diffusion equation will allow for radiation belt modeling with a better spatiotemporal resolution than radial diffusion models once realistic inputs, including localized transport and diffusion coefficients, are determined.","PeriodicalId":46793,"journal":{"name":"Frontiers in Astronomy and Space Sciences","volume":" ","pages":""},"PeriodicalIF":3.0,"publicationDate":"2023-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49552868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

A comparison of FORMOSAT-3/COSMIC radio occultation and ionosonde measurements in sporadic E detection over mid- and low-latitude regions FORMOSAT-3/COSMIC掩星与电离层探空在中低纬度地区散射E探测中的比较

IF 3 3区物理与天体物理

Frontiers in Astronomy and Space Sciences Pub Date : 2023-08-07 DOI: 10.3389/fspas.2023.1198071

S. Sobhkhiz-Miandehi, Y. Yamazaki, C. Arras, D. Themens

{"title":"A comparison of FORMOSAT-3/COSMIC radio occultation and ionosonde measurements in sporadic E detection over mid- and low-latitude regions","authors":"S. Sobhkhiz-Miandehi, Y. Yamazaki, C. Arras, D. Themens","doi":"10.3389/fspas.2023.1198071","DOIUrl":"https://doi.org/10.3389/fspas.2023.1198071","url":null,"abstract":"The investigation of sporadic E or Es layers typically relies on ground-based or satellite data. This study compares the Es layers recorded in ionograms with those detected using GNSS L1 signal-to-noise ratio data from FORMOSAT-3/COSMIC radio occultation at mid and low latitudes. GPS radio occultation measurements of Es layers, during an 11-year time span of 2007–2017, within a 2° latitude × 5° longitude grid around each ionosonde site are compared to the Es recordings of the ionosonde. By comparing multi-year radio occultation data with recordings from six ionosonde stations at mid and low latitudes, it was discovered that at least 20% of the Es layer detection results between each ionosonde and its crossing GPS radio occultation measurements did not agree. The results show that the agreement between the two methods in Es detection is highly dependent on the season and local time. This study suggests that Es layer recordings from ground-based ionosonde observations have the best agreement with the Es layers detected by radio occultation data during daytime and local summers. The difference in the Es detection mechanisms between the two methods can explain the inconsistency between Es events measured by these two methods. The detection of Es layers in ionograms relies on the high plasma concentration in the E region, whereas signal scintillations caused by a large vertical gradient of the plasma density in the E region are considered a sign of Es occurrence in satellite techniques.","PeriodicalId":46793,"journal":{"name":"Frontiers in Astronomy and Space Sciences","volume":" ","pages":""},"PeriodicalIF":3.0,"publicationDate":"2023-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46848565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hard rock dark biosphere and habitability 坚硬的岩石，黑暗的生物圈和宜居性

IF 3 3区物理与天体物理

Frontiers in Astronomy and Space Sciences Pub Date : 2023-08-04 DOI: 10.3389/fspas.2023.1203845

C. Escudero, R. Amils

引用次数: 0

A prominence eruption from the Sun to the Parker Solar Probe with multi-spacecraft observations 从太阳到帕克太阳探测器的一次突出喷发，多航天器观测

IF 3 3区物理与天体物理

Frontiers in Astronomy and Space Sciences Pub Date : 2023-08-03 DOI: 10.3389/fspas.2023.1191294

T. Niembro, D. Seaton, P. Hess, D. Berghmans, V. Andretta, K. Reeves, P. Riley, M. Stevens, F. Landini, C. Sasso, C. Verbeeck, R. Susino, M. Uslenghi

{"title":"A prominence eruption from the Sun to the Parker Solar Probe with multi-spacecraft observations","authors":"T. Niembro, D. Seaton, P. Hess, D. Berghmans, V. Andretta, K. Reeves, P. Riley, M. Stevens, F. Landini, C. Sasso, C. Verbeeck, R. Susino, M. Uslenghi","doi":"10.3389/fspas.2023.1191294","DOIUrl":"https://doi.org/10.3389/fspas.2023.1191294","url":null,"abstract":"In the early hours of 2021 April 25, the Solar Probe Cup on board Parker Solar Probe registered the passage of a solar wind structure characterized by a clear and constant He2+/H+ density ratio above 6% during three hours. The He2+ contribution remained present but fainting and intermittent within a twelve-hour window. Solar Orbiter and Parker Solar Probe were in nearly perfect quadrature, allowing for optimal observing configuration in which the material impacting the Parker Solar Probe was in the Solar Orbiter plane of the sky and visible off the limb. In this work, we report the journey of the helium-enriched plasma structure from the Sun to the Parker Solar Probe by combining multi-spacecraft remote-sensing and in situ measurements. We identify an erupting prominence as the likely source, behind the Sun relative to the Earth, but visible to multiple instruments on both the Solar-Terrestrial Relations Observatory-A and Solar Orbiter. The associated CME was also observed by coronagraphs and heliospheric imagers from both spacecrafts before reaching the Parker Solar Probe at 46 R⊙, 8 h after the spacecraft registered a crossing of the heliospheric current sheet. Except for extraordinary helium enhancement, the CME showed ordinary plasma signatures and a complex magnetic field with an overall strength enhancement. The images from the Wide-field Imager for Solar Probe (WISPR) aboard Parker Solar Probe show a structure entering the field of view a few hours before the in situ crossing, followed by repetitive transient structures that may be the result of flying through the CME body. We believe this to be the first example of a CME being imaged by WISPR directly before and during being detected in situ. This study highlights the potential of combining the Parker Solar Probe in situ measurements in the inner heliosphere with simultaneous remote-sensing observations in (near) quadrature from other spacecrafts.","PeriodicalId":46793,"journal":{"name":"Frontiers in Astronomy and Space Sciences","volume":" ","pages":""},"PeriodicalIF":3.0,"publicationDate":"2023-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41777446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1