Frontiers in Astronomy and Space Sciences最新文献_第8页

The reaction rate of radiative n8Li capture in the range from 0.01 to 10 T9 辐射俘获n8Li的反应速率在0.01～10T9范围内

IF 3 3区物理与天体物理

Frontiers in Astronomy and Space Sciences Pub Date : 2023-09-01 DOI: 10.3389/fspas.2023.1251743

S. Dubovichenko, B. Yeleusheva, N. Burkova, A. Tkachenko

{"title":"The reaction rate of radiative n8Li capture in the range from 0.01 to 10 T9","authors":"S. Dubovichenko, B. Yeleusheva, N. Burkova, A. Tkachenko","doi":"10.3389/fspas.2023.1251743","DOIUrl":"https://doi.org/10.3389/fspas.2023.1251743","url":null,"abstract":"Within the modified potential cluster model (MPCM) with forbidden states, the total cross sections are calculated for capture in the ground and first excited states of the 9Li nucleus in the n8Li channel in the energy range from 10−5 eV to 5 MeV based on Е1 and M1 transitions. The experimentally proved resonance at Ec.m. = 0.232 MeV in the 4P5/2 wave and ab initio-predicted 4P3/2 resonance at 1.32 MeV [Phys. Rev. C 103, 035801 (2021)] are considered. The strong impact of the asymptotic constant and channel spectroscopic factors on the total capture cross sections are responsible for the variation in the absolute values within factor two. As a consequence, the thermal cross sections are σtherm= 24–46.8 mb. The evaluation of σtherm based on the extrapolation of ab initio cross sections yields ∼85 mb. The reaction rate is calculated in the temperature range from 0.01 to 10 T9. The reported reaction rates are compared at the benchmark point 1 T9. The comparison of two datasets [Phys. Rev. C 103, 035801 (2021) and Phys. Rev. C 105, 064608 (2022)] on reaction rates recently calculated in microscopic models in extended temperature intervals shows the essential quantitative and qualitative differences. The comparative joint analysis of the reaction rates of radiative neutron capture on the lithium isotopes 6,7,8Li is suggested for the choice of an optimal interval for the asymptotic constants.","PeriodicalId":46793,"journal":{"name":"Frontiers in Astronomy and Space Sciences","volume":" ","pages":""},"PeriodicalIF":3.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48220459","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

Prospect for measurements of (γ, n) reaction cross-sections of p-nuclei at ELI-NP ELI-NP测量p核（γ，n）反应截面的前景

IF 3 3区物理与天体物理

Frontiers in Astronomy and Space Sciences Pub Date : 2023-08-31 DOI: 10.3389/fspas.2023.1248834

P. Söderström, A. Kuşoğlu, D. Testov

引用次数: 0

Challenges and interpersonal dynamics during a two-person lunar analogue Arctic mission 两人月球模拟北极任务期间的挑战和人际关系动态

IF 3 3区物理与天体物理

Frontiers in Astronomy and Space Sciences Pub Date : 2023-08-30 DOI: 10.3389/fspas.2023.1184547

Pedro Marques-Quinteiro, Andres Käosaar, Paola Barros Delben, Anders Kjærgaard, G. R. Leon

{"title":"Challenges and interpersonal dynamics during a two-person lunar analogue Arctic mission","authors":"Pedro Marques-Quinteiro, Andres Käosaar, Paola Barros Delben, Anders Kjærgaard, G. R. Leon","doi":"10.3389/fspas.2023.1184547","DOIUrl":"https://doi.org/10.3389/fspas.2023.1184547","url":null,"abstract":"Introduction: This case study was designed as an analog for aspects of NASA’s planned Artemis missions to the lunar surface. The specific aims were to examine emerged mission challenges and dyadic affective and process dynamics over the course of a three-month lunar habitat analog Arctic mission.Methods: Participants were two men who also had key roles in designing the habitat. Pre- and post- expedition interviews were conducted and daily satellite phone messages to mission control over the three-month mission were assessed. An integrated mixed methods approach was used to analyze challenges, group affect, and group processes, with the goal of furthering the understanding of coping and psychosocial work experiences in challenging conditions.Results: The findings indicated that different challenges took distinct temporal trajectories across mission phases; based on the relational themes, several challenges were identified, primarily physical challenges related to the experience of coping in an ICE environment, and psychosocial challenges associated with the preparation and execution of mission tasks. Physical challenges, positive tone, and action processes were the themes most connected to each other. To deal with these challenges, the team adapted by more frequently engaging in action and transition processes. The specific training for the mission the participants engaged in, and prior knowledge about each other enabled team members to deal with mission exigencies while maintaining a positive outlook.Discussion: Fostering strong positive relationships was an important mechanism to build resilience and effective performance while under ongoing, extreme conditions.","PeriodicalId":46793,"journal":{"name":"Frontiers in Astronomy and Space Sciences","volume":" ","pages":""},"PeriodicalIF":3.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44848458","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

A system science methodology develops a new composite highly predictable index of magnetospheric activity for the community: the whole-Earth index E(1) 一种系统科学方法为社区开发了一种新的复合的高度可预测的磁层活动指数:全地球指数E(1)。

IF 3 3区物理与天体物理

Frontiers in Astronomy and Space Sciences Pub Date : 2023-08-28 DOI: 10.3389/fspas.2023.1214804

J. Borovsky, Christian J. Lao

{"title":"A system science methodology develops a new composite highly predictable index of magnetospheric activity for the community: the whole-Earth index E(1)","authors":"J. Borovsky, Christian J. Lao","doi":"10.3389/fspas.2023.1214804","DOIUrl":"https://doi.org/10.3389/fspas.2023.1214804","url":null,"abstract":"For community use, a new composite whole-Earth index E(1) and its matching composite solar wind driving function S(1) are derived. A system science methodology is used based on a time-dependent magnetospheric state vector and a solar wind state vector, with canonical correlation analysis (CCA) used to reduce the two state vectors to the two time-dependent scalars E(1)(t) and S(1)(t). The whole-Earth index E(1) is based on a diversity of measures via six diverse geomagnetic indices that will be readily available in the future: SML, SMU, Ap60, SYMH, ASYM, and PCC. The CCA-derived composite index has several advantages: 1) the new “canonical” geomagnetic index E(1) will provide a more powerful description of magnetospheric activity, a description of the collective behavior of the magnetosphere–ionosphere system. 2) The new index E(1) is much more accurately predictable from upstream solar wind measurements on Earth. 3) Indications are that the new canonical geomagnetic index E(1) will be accurately predictable even when as-yet-unseen extreme solar wind conditions occur. The composite solar wind driver S(1) can also be used as a universal driver function for individual geomagnetic indices or for magnetospheric particle populations. To familiarize the use of the new index E(1), its behavior is examined in different phases of the solar cycle, in different types of solar wind plasma, during high-speed stream-driven storms, during CME sheath-driven storms, and during superstorms. It is suggested that the definition of storms are the times when E(1) >1.","PeriodicalId":46793,"journal":{"name":"Frontiers in Astronomy and Space Sciences","volume":" ","pages":""},"PeriodicalIF":3.0,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47988573","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

The importance of recruitment and retention in Heliophysics: it’s not just a pipeline problem 在太阳物理学中招聘和保留的重要性:这不仅仅是一个管道问题

3区物理与天体物理

Frontiers in Astronomy and Space Sciences Pub Date : 2023-08-25 DOI: 10.3389/fspas.2023.1216449

Alexa J. Halford, Christopher M. Bard, Angeline G. Burrell, Ryan M. McGranaghan, Lynn B. Wilson III, McArthur Jones, Chuanfei Dong, Liang Wang, Tuija I. Pulkkinen, Niescja Turner, Michael W. Liemohn, Jeff Klenzing

{"title":"The importance of recruitment and retention in Heliophysics: it’s not just a pipeline problem","authors":"Alexa J. Halford, Christopher M. Bard, Angeline G. Burrell, Ryan M. McGranaghan, Lynn B. Wilson III, McArthur Jones, Chuanfei Dong, Liang Wang, Tuija I. Pulkkinen, Niescja Turner, Michael W. Liemohn, Jeff Klenzing","doi":"10.3389/fspas.2023.1216449","DOIUrl":"https://doi.org/10.3389/fspas.2023.1216449","url":null,"abstract":"A major obstacle in cultivating a robust Heliophysics (and broader scientific) community is the lack of diversity throughout science, technology, engineering, and mathematics (STEM) fields. For many years, this has been understood as a “leaky pipeline” analogy, in which predominately minority students initially interested in STEM gradually fall (or are pushed) out of the field on their way to a scientific research position. However, this ignores critical structural and policy issues which drive even later career Ph.D.s out of a career in Heliophysics. We identify here several systemic problems that inhibit many from participating fully in the Heliophysics community, including soft money pressure, lack of accessibility and equity, power imbalances, lack of accountability, friction in collaboration, and difficulties in forming mentorship bonds. We present several recommendations to empower research-supporting organizations to help create a culture of inclusion, openness, and innovative science.","PeriodicalId":46793,"journal":{"name":"Frontiers in Astronomy and Space Sciences","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135286357","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

Editorial: Generalized uncertainty relations: existing paradigms and new approaches 社论:广义不确定性关系:现有范式和新方法

IF 3 3区物理与天体物理

Frontiers in Astronomy and Space Sciences Pub Date : 2023-08-24 DOI: 10.3389/fspas.2023.1246781

Matthew J. Lake, T. Harko, Shi‐Dong Liang

引用次数: 0

Equatorial plasma bubbles features over the Brazilian sector according to the solar cycle and geomagnetic activity level 根据太阳周期和地磁活动水平，赤道等离子体气泡在巴西上空具有特征

IF 3 3区物理与天体物理

Frontiers in Astronomy and Space Sciences Pub Date : 2023-08-24 DOI: 10.3389/fspas.2023.1252511

C. S. Carmo, L. Dai, C. Denardini, C. Figueiredo, C. M. Wrasse, L. Resende, D. Barros, J. Moro, S. Chen, G. Picanço, R. P. Silva, C. Wang, H. Li, Z. Liu

{"title":"Equatorial plasma bubbles features over the Brazilian sector according to the solar cycle and geomagnetic activity level","authors":"C. S. Carmo, L. Dai, C. Denardini, C. Figueiredo, C. M. Wrasse, L. Resende, D. Barros, J. Moro, S. Chen, G. Picanço, R. P. Silva, C. Wang, H. Li, Z. Liu","doi":"10.3389/fspas.2023.1252511","DOIUrl":"https://doi.org/10.3389/fspas.2023.1252511","url":null,"abstract":"Equatorial plasma bubbles (EPBs) can lead to signal degradation, affecting the measurement accuracy. Studying EPBs and their characteristics has gained increasing importance. The characteristics of EPBs were investigated using the rate of total electron content (TEC) index (ROTI) maps under different solar and magnetic activity conditions during two periods: July 2014–July 2015 (solar maximum activity with F10.7: 145.9 × 10−22 W⋅m−2⋅Hz−1) and July 2019–July 2020 (solar minimum activity with F10.7: 69.7 × 10−22 W⋅m−2⋅Hz−1). We also divided this analysis according to the magnetic activity levels based on Kp and Dst (disturbance storm time) indices, classified as follows: quiet+ (Kp ≤3 and Dst >−30 nT), quiet− (Kp ≤3 and Dst <−30 nT), disturbed weak (−50 nT <Dst ≤−30 nT), moderate (−100 nT <Dst ≤−50 nT), and intense (Dst ≤−100 nT). The ROTI is calculated using the slant TEC with the carrier phase, and its keograms are used to extract the zonal velocity and distance. Our statistical investigation shows the occurrence rate, duration, zonal drift velocity, and inter-bubble zonal distance of EPBs over the Brazilian sector. The latitudinal extension and zonal drift velocity of EPBs are higher during the solar maximum than those in the solar minimum. In addition, EPBs are found with unusually long durations, remaining until the morning (∼12 UT), and 10% of EPB observations occurred on the winter solstice.","PeriodicalId":46793,"journal":{"name":"Frontiers in Astronomy and Space Sciences","volume":" ","pages":""},"PeriodicalIF":3.0,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48086847","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

Deep learning model of hiss waves in the plasmasphere and plumes and their effects on radiation belt electrons 等离子体层和羽流中嘶嘶波的深度学习模型及其对辐射带电子的影响

IF 3 3区物理与天体物理

Frontiers in Astronomy and Space Sciences Pub Date : 2023-08-23 DOI: 10.3389/fspas.2023.1231578

Sheng Huang, Wen Li, Q. Ma, Xiaochen Shen, L. Capannolo, M. Hanzelka, X. Chu, Donglai Ma, J. Bortnik, S. Wing

{"title":"Deep learning model of hiss waves in the plasmasphere and plumes and their effects on radiation belt electrons","authors":"Sheng Huang, Wen Li, Q. Ma, Xiaochen Shen, L. Capannolo, M. Hanzelka, X. Chu, Donglai Ma, J. Bortnik, S. Wing","doi":"10.3389/fspas.2023.1231578","DOIUrl":"https://doi.org/10.3389/fspas.2023.1231578","url":null,"abstract":"Hiss waves play an important role in removing energetic electrons from Earth’s radiation belts by precipitating them into the upper atmosphere. Compared to plasmaspheric hiss that has been studied extensively, the evolution and effects of plume hiss are less understood due to the challenge of obtaining their global observations at high cadence. In this study, we use a neural network approach to model the global evolution of both the total electron density and the hiss wave amplitudes in the plasmasphere and plume. After describing the model development, we apply the model to a storm event that occurred on 14 May 2019 and find that the hiss wave amplitude first increased at dawn and then shifted towards dusk, where it was further excited within a narrow region of high density, namely, a plasmaspheric plume. During the recovery phase of the storm, the plume rotated and wrapped around Earth, while the hiss wave amplitude decayed quickly over the nightside. Moreover, we simulated the overall energetic electron evolution during this storm event, and the simulated flux decay rate agrees well with the observations. By separating the modeled plasmaspheric and plume hiss waves, we quantified the effect of plume hiss on energetic electron dynamics. Our simulation demonstrates that, under relatively quiet geomagnetic conditions, the region with plume hiss can vary from L = 4 to 6 and can account for up to an 80% decrease in electron fluxes at hundreds of keV at L > 4 over 3 days. This study highlights the importance of including the dynamic hiss distribution in future simulations of radiation belt electron dynamics.","PeriodicalId":46793,"journal":{"name":"Frontiers in Astronomy and Space Sciences","volume":" ","pages":""},"PeriodicalIF":3.0,"publicationDate":"2023-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47847459","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

Interplanetary shock data base 星际撞击数据库

IF 3 3区物理与天体物理

Frontiers in Astronomy and Space Sciences Pub Date : 2023-08-22 DOI: 10.3389/fspas.2023.1240323

D. Oliveira

引用次数: 0

Three-dimensional inversion of corona structure and simulation of solar wind parameters based on the photospheric magnetic field deduced from the Global Oscillation Network Group 基于全球振荡网群光球磁场的日冕结构三维反演及太阳风参数模拟

IF 3 3区物理与天体物理

Frontiers in Astronomy and Space Sciences Pub Date : 2023-08-21 DOI: 10.3389/fspas.2023.1234391

Xiao Zhang, S. Qiu, W. Soon, Hamad Yousof

{"title":"Three-dimensional inversion of corona structure and simulation of solar wind parameters based on the photospheric magnetic field deduced from the Global Oscillation Network Group","authors":"Xiao Zhang, S. Qiu, W. Soon, Hamad Yousof","doi":"10.3389/fspas.2023.1234391","DOIUrl":"https://doi.org/10.3389/fspas.2023.1234391","url":null,"abstract":"In this research, the Potential Field Source Surface–Wang–Sheeley–Arge (PFSS–WSA) solar wind model is used. This model consists of the Potential Field Source Surface (PFSS) coronal magnetic field extrapolation module and the Wang–Sheeley–Arge (WSA) solar wind velocity module. PFSS is implemented by the POT3D package deployed on Tianhe 1A supercomputer system. In order to obtain the three–dimensional (3D) distribution of the coronal magnetic field at different source surface radii (Rss), the model utilizes the Global Oscillation Network Group (GONG) photospheric magnetic field profiles for two Carrington rotations (CRs), CR2069 (in 2008) and CR2217 (in 2019), as the input data, with the source surface at Rss = 2Rs, Rss = 2.5Rs and Rss = 3Rs, respectively. Then the solar wind velocity, the coronal magnetic field expansion factor, and the minimum angular distance of the open magnetic field lines from the coronal hole boundary are estimated within the WSA module. The simulated solar wind speed is compared with the value for the corona extrapolated from the data observed near 1 AU, through the calculations of the mean square error (MSE), root mean square error (RMSE) and correlation coefficient (CC). Here we extrapolate the solar wind velocity at 1 AU back to the source surface via the Parker spiral. By comparing the evaluation metrics of the three source surface heights, we concluded that the solar source surface should be properly decreased with respect to Rss = 2.5Rs during the low solar activity phase of solar cycle 23.","PeriodicalId":46793,"journal":{"name":"Frontiers in Astronomy and Space Sciences","volume":" ","pages":""},"PeriodicalIF":3.0,"publicationDate":"2023-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45575199","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