Journal of Astronomy and Space Sciences最新文献_第4页

Feasibility Study of Communication Access via Iridium Constellation for Small-Scale Magnetospheric Ionospheric Plasma Experiment Mission 小型磁层电离层等离子体实验任务铱星通信接入可行性研究

IF 0.5

Journal of Astronomy and Space Sciences Pub Date : 2022-09-01 DOI: 10.5140/jass.2022.39.3.109

Hosub Song, Jaejin Lee, Y. Yi

{"title":"Feasibility Study of Communication Access via Iridium Constellation for Small-Scale\u0000 Magnetospheric Ionospheric Plasma Experiment Mission","authors":"Hosub Song, Jaejin Lee, Y. Yi","doi":"10.5140/jass.2022.39.3.109","DOIUrl":"https://doi.org/10.5140/jass.2022.39.3.109","url":null,"abstract":"The small-scale magnetospheric and ionospheric plasma experiment (SNIPE) is a\u0000 mission initiated by the Korea Astronomy and Space Science Institute (KASI) in 2017 and\u0000 comprises four 6U-sized nano-satellites (Korea Astronomy and Space Science Institute\u0000 Satellite-1, KASISat-1) flying in formations. The main goal of the SNIPE mission is to\u0000 investigate the space environment in low Earth orbit at 500-km. Because Iridium &\u0000 GPS Board (IGB) is installed on the KASISat-1, a communication simulation is required to\u0000 analyze the contact number and the duration. In this study, communication simulations\u0000 between the Iridium satellite network and KASISat-1 are performed using STK Pro (System\u0000 Tool Kit Pro Ver 11.2) from the AGI (Analytical Graphics, Inc.). The contact number and\u0000 durations were analyzed by each orbit and date. The analysis shows that the average\u0000 access number per day is 38.714 times, with an average of 2.533 times per orbit for a\u0000 week. Furthermore, on average, the Iridium satellite communication is linked for 70.597\u0000 min daily. Moreover, 4.625 min is the average duration of an individual orbit.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82843218","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

Thermospheric Wind Observation and Simulation during the Nov 4, 2021 Geomagnetic Storm Event 2021年11月4日地磁暴事件的热层风观测与模拟

IF 0.5

Journal of Astronomy and Space Sciences Pub Date : 2022-09-01 DOI: 10.5140/jass.2022.39.3.79

Qian Wu, D. Lin, Wenbin Wang, W. Ward

引用次数: 1

Climatology of Equatorial Plasma Bubbles in Ionospheric Connection Explorer/Far-UltraViolet (ICON/FUV) Limb Images 电离层连接探测器/远紫外(ICON/FUV)边缘图像中赤道等离子体气泡的气候学

IF 0.5

Journal of Astronomy and Space Sciences Pub Date : 2022-09-01 DOI: 10.5140/jass.2022.39.3.87

Jaeheung Park, S. Mende, R. Eastes, H. Frey

{"title":"Climatology of Equatorial Plasma Bubbles in Ionospheric Connection\u0000 Explorer/Far-UltraViolet (ICON/FUV) Limb Images","authors":"Jaeheung Park, S. Mende, R. Eastes, H. Frey","doi":"10.5140/jass.2022.39.3.87","DOIUrl":"https://doi.org/10.5140/jass.2022.39.3.87","url":null,"abstract":"The Far-UltraViolet (FUV) imager onboard the Ionospheric Connection Explorer\u0000 (ICON) spacecraft provides two-dimensional limb images of oxygen airglow in the\u0000 nightside low-latitude ionosphere that are used to determine the oxygen ion density. As\u0000 yet, no FUV limb imager has been used for climatological analyses of Equatorial Plasma\u0000 Bubbles (EPBs). To examine the potential of ICON/FUV for this purpose, we statistically\u0000 investigate small-scale (~180 km) fluctuations of oxygen ion density in its limb images.\u0000 The seasonal-longitudinal variations of the fluctuation level reasonably conform to the\u0000 EPB statistics in existing literature. To further validate the ICON/FUV data quality, we\u0000 also inspect climatology of the ambient (unfiltered) nightside oxygen ion density. The\u0000 ambient density exhibits (1) the well-known zonal wavenumber-4 signatures in the\u0000 Equatorial Ionization Anomaly (EIA) and (2) off-equatorial enhancement above the\u0000 Caribbean, both of which agree with previous studies. Merits of ICON/FUV observations\u0000 over other conventional data sets are discussed in this paper. Furthermore, we suggest\u0000 possible directions of future work, e.g., synergy between ICON/FUV and the Global-scale\u0000 Observations of the Limb and Disk (GOLD) mission.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90176087","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: 3

Science Objectives and Design of Ionospheric Monitoring Instrument Ionospheric Anomaly Monitoring by Magnetometer And Plasmaprobe (IAMMAP) for the CAS500-3 Satellite CAS500-3卫星电离层异常磁强计与等离子体探针监测(IAMMAP)的科学目标与设计

IF 0.5

Journal of Astronomy and Space Sciences Pub Date : 2022-09-01 DOI: 10.5140/jass.2022.39.3.117

K. Ryu, Seunguk Lee, C. Woo, Junchan Lee, E. Jang, Jaemin Hwang, Jin-Kyu Kim, Wonho Cha, Dong-guk Kim, BonJu Koo, S. Park, Dooyoung Choi, C.‐R. Choi

{"title":"Science Objectives and Design of Ionospheric Monitoring Instrument Ionospheric\u0000 Anomaly Monitoring by Magnetometer And Plasmaprobe (IAMMAP) for the CAS500-3\u0000 Satellite","authors":"K. Ryu, Seunguk Lee, C. Woo, Junchan Lee, E. Jang, Jaemin Hwang, Jin-Kyu Kim, Wonho Cha, Dong-guk Kim, BonJu Koo, S. Park, Dooyoung Choi, C.‐R. Choi","doi":"10.5140/jass.2022.39.3.117","DOIUrl":"https://doi.org/10.5140/jass.2022.39.3.117","url":null,"abstract":"The Ionospheric Anomaly Monitoring by Magnetometer And Plasma-probe (IAMMAP) is\u0000 one of the scientific instruments for the Compact Advanced Satellite 500-3 (CAS 500-3)\u0000 which is planned to be launched by Korean Space Launch Vehicle in 2024. The main\u0000 scientific objective of IAMMAP is to understand the complicated correlation between the\u0000 equatorial electro-jet (EEJ) and the equatorial ionization anomaly (EIA) which play\u0000 important roles in the dynamics of the ionospheric plasma in the dayside equator region.\u0000 IAMMAP consists of an impedance probe (IP) for precise plasma measurement and\u0000 magnetometers for EEJ current estimation. The designated sun-synchronous orbit along the\u0000 quasi-meridional plane makes the instrument suitable for studying the EIA and EEJ. The\u0000 newly-devised IP is expected to obtain the electron density of the ionosphere with\u0000 unprecedented precision by measuring the upper-hybrid frequency (fUHR) of the\u0000 ionospheric plasma, which is not affected by the satellite geometry, the spacecraft\u0000 potential, or contamination unlike conventional Langmuir probes. A set of\u0000 temperaturetolerant precision fluxgate magnetometers, called Adaptive In-phase\u0000 MAGnetometer, is employed also for studying the complicated current system in the\u0000 ionosphere and magnetosphere, which is particularly related with the EEJ caused by the\u0000 potential difference along the zonal direction.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85689248","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

On the Influence of the Moment of Inertia of Gas on the Galactic Rotation Curves 气体转动惯量对星系旋转曲线的影响

IF 0.5

Journal of Astronomy and Space Sciences Pub Date : 2022-09-01 DOI: 10.5140/jass.2022.39.3.99

Y. Portnov

引用次数: 0

Interaction of Ion Cyclotron Electromagnetic Wave with Energetic Particles in the Existence of Alternating Electric Field Using Ring Distribution 交变电场存在下离子回旋电磁波与高能粒子相互作用的环形分布

IF 0.5

Journal of Astronomy and Space Sciences Pub Date : 2022-06-01 DOI: 10.5140/jass.2022.39.2.67

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

{"title":"Interaction of Ion Cyclotron Electromagnetic Wave with Energetic Particles in the\u0000 Existence of Alternating Electric Field Using Ring Distribution","authors":"K. N. Shukla, J. Kumari, R. S. Pandey","doi":"10.5140/jass.2022.39.2.67","DOIUrl":"https://doi.org/10.5140/jass.2022.39.2.67","url":null,"abstract":"The elements that impact the dynamics and collaborations of waves and particles\u0000 in the magnetosphere of planets have been considered here. Saturn’s internal\u0000 magnetosphere is determined by substantiated instabilities and discovered to be an\u0000 exceptional zone of wave activity. Interchanged instability is found to be one of the\u0000 responsible events in view of temperature anisotropy and energization processes of\u0000 magnetospheric species. The generated active ions alongside electrons that constitute\u0000 the populations of highly magnetized planets like Saturn’s ring electron current are\u0000 taken into consideration in the current framework. The previous and similar method of\u0000 characteristics and the perturbed distribution function have been used to derive\u0000 dispersion relation. In incorporating this investigation, the characteristics of\u0000 electromagnetic ion cyclotron wave (EMIC) waves are determined by the composition of\u0000 ions in plasmas through which the waves propagate. The effect of ring distribution\u0000 illustrates non-monotonous description on growth rate (GR) depending upon plasma\u0000 parameters picked out. Observations made by Cassini found appropriate for modern study,\u0000 have been applied to the Kronian magnetosphere. Using Maxwellian ring distribution\u0000 function of ions and detailed mathematical formulation, an expression for dispersion\u0000 relation as well as GR and real frequency (RF) are evaluated. Analysis of plasma\u0000 parameters shows that, proliferating EMIC waves are not developed much when propagation\u0000 is parallelly aligned with magnetosphere as compared to waves propagating in oblique\u0000 direction. GR for the oblique case, is influenced by temperature anisotropy as well as\u0000 by alternating current (AC) frequency, whereas it is much affected only by AC frequency\u0000 for parallel propagating waves.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88663510","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

Moment of Inertia of Gas as a Source of Added Gravitational Field in Galaxies 星系中作为附加引力场来源的气体转动惯量

IF 0.5

Journal of Astronomy and Space Sciences Pub Date : 2022-06-01 DOI: 10.5140/jass.2022.39.2.59

Y. Portnov

引用次数: 0

Analysis of Cosmic Radiation Exposure for Domestic Flight Crews in Korea 韩国国内飞行机组人员宇宙辐射暴露分析

IF 0.5

Journal of Astronomy and Space Sciences Pub Date : 2022-06-01 DOI: 10.5140/jass.2022.39.2.51

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

{"title":"Analysis of Cosmic Radiation Exposure for Domestic Flight Crews in Korea","authors":"Hee-Bok Ahn, Jung-Lae Hwang, Jaeyoung Kwak, Kyuwang Kim","doi":"10.5140/jass.2022.39.2.51","DOIUrl":"https://doi.org/10.5140/jass.2022.39.2.51","url":null,"abstract":"Cosmic radiation exposure of the flight crews in Korea has been managed by\u0000 Radiation Safety Management around Living Life Act under Nuclear Safety and Security\u0000 Commission. However, the domestic flight crews are excluded from the Act because of\u0000 relatively low route dose exposure compared to that of international flight crews. But\u0000 we found that the accumulated total annual dose of domestic flight crews is far from\u0000 negligible because of relatively long total flight time and too many flights. In this\u0000 study, to suggest the necessity of management of domestic flight crews’ radiation\u0000 exposure, we statistically analyzed domestic flight crew’s accumulative annual dose by\u0000 using cosmic radiation estimation models of the Civil Aviation Research Institute\u0000 (CARI)-6M, Nowcast of Atmospheric Ionizing Radiation for Aviation Safety (NAIRAS), and\u0000 Korean Radiation Exposure Assessment Model (KREAM) and compared with in-situ\u0000 measurements of Liulin-6K LET spectrometer. As a result, the average exposure dose of\u0000 domestic flight crews was found to be 0.5–0.8 mSv. We also expect that our result might\u0000 provide the basis to include the domestic flight crews as radiation workers, not just\u0000 international flight attendants.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84463883","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

Testing the Consistency of Unified Scheme of Seyfert Galaxies 塞弗特星系统一格式的一致性检验

IF 0.5

Journal of Astronomy and Space Sciences Pub Date : 2022-06-01 DOI: 10.5140/jass.2022.39.2.43

E. U. Iyida, Innocent Okwudili Eya, C. I. Eze

{"title":"Testing the Consistency of Unified Scheme of Seyfert Galaxies","authors":"E. U. Iyida, Innocent Okwudili Eya, C. I. Eze","doi":"10.5140/jass.2022.39.2.43","DOIUrl":"https://doi.org/10.5140/jass.2022.39.2.43","url":null,"abstract":"The unified scheme of Seyfert galaxies hypothesizes that the observed differences\u0000 between the two categories of Seyfert galaxies, type 1 (Sy1) and type 2 (Sy2) are merely\u0000 due to the difference in the orientation of the toroidal shape of the obscuring material\u0000 in the active galactic nuclei. We used in this paper, a sample consisting of 120 Seyfert\u0000 galaxies at 1.40 × 109 Hz in radio, 2.52 × 1017 Hz in X-ray and 2.52 × 1023 Hz in γ-ray\u0000 luminosities observed by the Fermi Large Area Telescope (Fermi- LAT) in order to test\u0000 the unified scheme of radio-quiet Seyfert galaxies. Our main results are as follows: (i)\u0000 We found that the distributions of multiwave luminosities (Lradio, LX-ray, and Lγ-ray)\u0000 of Sy1 and Sy2 are completely overlapped with up to a factor of 4. The principal\u0000 component analysis result reveals that Sy1 and Sy2 also occupy the same parameter\u0000 spaces, which agrees with the notion that Sy1 and Sy2 are the same class objects. A\u0000 Kolmogorov-Smirnov test performed on the sub-samples indicates that the null hypothesis\u0000 (both are from the same population) cannot be rejected with chance probability p ~ 0 and\u0000 separation distance K = 0.013. This result supports the fact that there is no\u0000 statistical difference between the properties of Sy1 and Sy2 (ii) We found that the\u0000 coefficient of the best-fit linear regression equation between the common properties of\u0000 Sy1 and Sy2 is significant (r > 0.50) which plausibly implies that Sy1 and Sy2 are\u0000 the same type of objects observed at different viewing angle.","PeriodicalId":44366,"journal":{"name":"Journal of Astronomy and Space Sciences","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88148807","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

The Occurrence Climatology of Equatorial Plasma Bubbles: A Review 赤道等离子体气泡的发生气候学研究进展

IF 0.5

Journal of Astronomy and Space Sciences Pub Date : 2022-06-01 DOI: 10.5140/jass.2022.39.2.23

H. Kil

引用次数: 1