Excitation of Storm-Time Pc5 ULF Waves During the 22 July 2009 Storm: Comparison of GOES, Ground Observations, and GEMSIS Coupled Simulation

IF 2.6 2区 地球科学 Q2 ASTRONOMY & ASTROPHYSICS
Tomotsugu Yamakawa, Kanako Seki, Yoshizumi Miyoshi, Aoi Nakamizo, Kazuhiro Yamamoto
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Abstract

Internally driven ULF waves are excited in the premidnight region during the magnetic storm on 22 July 2009. The excitation of ULF waves was investigated based on the Geospace Environment Modeling System for Integrated Studies (GEMSIS) magnetosphere-ionosphere coupled model, GOES spacecrafts, and ground magnetometers. In order to apply the GEMSIS coupled model to the magnetic storm, we included solar wind conditions and loss term of ring current ions due to charge exchange in the model. During the magnetic storm on 22 July 2009, the SYM-H index dropped to nearly −90 nT at 06:00 and 09:00 UT. Poloidal ULF waves were observed by GOES satellites and ground stations from 02:50 to 03:40 UT in the premidnight region. Wave frequency of observed ULF waves was in the range of 1.3–1.8 mHz, and the m number was relatively small, ranging from −3 to −6, propagating westward. ULF waves are also generated in the model from 02:50 UT in the premidnight region. Wave frequency and the m number are similar between the model and observations. Simulation results suggest that the waves are generated by the drift resonance with ring current ions at 50–200 keV and inward gradient of ion PSD contributes to the wave growth. These results indicate that the GEMSIS coupled model is capable of providing the excitation mechanism and global distribution of observed ULF waves.

Abstract Image

2009年7月22日风暴期间Pc5 ULF波的激发:GOES、地面观测和GEMSIS耦合模拟的比较
在2009年7月22日的磁暴中,内部驱动的极低频波在午夜前区域被激发。基于地球空间环境综合建模系统(GEMSIS)磁层-电离层耦合模型、GOES航天器和地面磁力计,对极低频波的激发进行了研究。为了将GEMSIS耦合模型应用于磁暴,我们在模型中加入了太阳风条件和环电流离子因电荷交换而损失项。在2009年7月22日磁暴期间,SYM-H指数在世界时06:00和09:00降至近- 90 nT。GOES卫星和地面站从世界时02:50 ~ 03:40在午夜前区域观测到极向ULF波。观测到的ULF波的波频在1.3 ~ 1.8 mHz之间,m数相对较小,在−3 ~−6之间,向西传播。超短波波在模型中也产生于02:50 UT的午夜前区域。模型与观测值的波频和m数相似。仿真结果表明,在50 ~ 200kev范围内,环形电流离子漂移共振产生了波,离子PSD向内梯度有助于波的生长。这些结果表明,GEMSIS耦合模型能够提供观测到的极低频波的激发机制和全局分布。
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来源期刊
Journal of Geophysical Research: Space Physics
Journal of Geophysical Research: Space Physics Earth and Planetary Sciences-Geophysics
CiteScore
5.30
自引率
35.70%
发文量
570
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