Latitudinal amplitude-phase structure of MHD waves: STARE radar and image magnetometer observations and modeling

Solar-Terrestrial Physics

Pilipenko Vyacheslav Anatol'evich¹ 

关键词: MHD waves;    Geomagnetic pulsations;    Mode conversion;    Ionospheric radar;    Magnetometer;   

DOI  :  10.12737/22285

学科分类：天文学(综合)

来源: INFRA-M

【 摘 要 】

We have developed a numerical model that yields a steady-state distribution of field components of MHD wave in an inhomogeneous plasma box simulating the realistic magnetosphere. The problem of adequate boundary condition at the ionosphere–magnetosphere interface for coupled MHD mode is considered. To justify the model’s assumptions, we have derived the explicit inequality showing when the ionospheric inductive Hall effect can be neglected upon the consideration of Alfven wave reflection from the ionospheric boundaries. The model predicts a feature of the ULF spatial amplitude/phase distribution that has not been noticed by the field line resonance theory: the existence of a region with opposite phase delays on the source side of the resonance. This theoretical prediction is supported by the amplitude-phase latitudinal structures of Pc5 waves observed by STARE radar and IMAGE magnetometers. A gradual decrease in azimuthal wave number m at smaller L-shells was observed at longitudinally separated radar beams.

【 授权许可】

CC BY-NC-ND