JpGU-AGU Joint Meeting 2017

講演情報

[EE] ポスター発表

セッション記号 P (宇宙惑星科学) » P-EM 太陽地球系科学・宇宙電磁気学・宇宙環境

[P-EM16] [EE] Physics of Inner Magnetosphere Coupling

2017年5月24日(水) 13:45 〜 15:15 ポスター会場 (国際展示場 7ホール)

コンビーナ:Danny Summers(Memorial University of Newfoundland)、Jichun Zhang(University of New Hampshire Main Campus)、海老原 祐輔(京都大学生存圏研究所)、桂華 邦裕(東京大学大学院理学系研究科地球惑星科学専攻)、Aleksandr Y Ukhorskiy(Johns Hopkins University Applied Physics Laboratory)、Dae-Young Lee(Chungbuk Natl Univ)、Yiqun Yu(Beihang University)、三好 由純(名古屋大学宇宙地球環境研究所)

[PEM16-P32] A statistical investigation of plasmaspheric plasma by using global GPS TEC data

*Qing-He Zhang1Gun Li2Yan-Qiu Ren1,2Yong Wang1John Foster3Michael Lockwood4Shun-Rong Zhang3 (1.Institute of Space Sciences, Shandong University, Weihai, China、2.School of Aeronautics and Astronautics, University of Electronic Science and Technology of China,Chengdu, China.、3.Haystack Observatory, Massachusetts Institute of Technology, Westford, Massachusetts, USA、4.Department of Meteorology, University of Reading, Earley Gate, Post Office Box 243, RG6 6BB, UK.)

キーワード:Plasmaspheric plasma, Plasmaspheric plume, plasmaspheric refilling

A statistical analysis of the daily, monthly, yearly and solar cycle variations of plasmaspheric plasma from near earth to the dayside magnetopause is investigated by using the equatorial mapping data of the ground-based global position system (GPS) total electron content (TEC) from the noon meridian for the years of 2003-2015. During the geomagnetic storms, the mapped TEC data often showed clear plume structures in the afternoon sectors, which had been detached from plasmasphere towards sunward and reached the dayside magnetopause. However, the plasma in the plume was exhausted after the main phase of the storms and the plasmasphere needed one day or a few days to be refilled. This exhaustion may be because of the plasmspheric plasma escaping through the dayside magnetopause where the magnetic reconnection or magnetopause shadowing occurred. The mapped TEC plumes and plasmasphere refillings preferred to appear around every afternoon and often reached the dayside magnetopause with different TEC value depending on the solar and geomagnetic conditions, which also preferred to appear in the months from March to May and from October to December and in the years during solar maximum. These results may suggest that the plasma in the plumes escaped away through the magnetopause due to the dayside magnetic reconnection or magnetopause shadowing during the recover phase of the geomagnetic storms, and the polar ionosphere continuously refills plasma into the plasmasphere during the quiet days, which can be stored and partially convected sunward to the dayside magnetopause for forming plumes.