Features of formation of small-scale wave disturbances during a sudden magnetospheric compression-Reference-Cited by-同舟云学术

Features of formation of small-scale wave disturbances during a sudden magnetospheric compression

Published:2017-06-29 Issue:2 Volume:3 Page:36-44
ISSN:2412-4737
Container-title:Solnechno-Zemnaya Fizika
language:en
Short-container-title:

Author:

Моисеев Алексей¹,Moiseev Aleksey²,Баишев Дмитрий¹,Baishev Dmitry³,Мишин Владимир⁴,Mishin Vladimir⁵,Уозуми Т.⁶,Uozumi T.⁷,Йошикава Акимаса⁶,Yoshikawa Akimasa⁷,Ду А.⁸,Du A.⁹

Affiliation:

1. Институт космофизических исследований и аэрономии им. Ю.Г. Шафера СО РАН

2. Yu.G. Shafer Institute of Cosmophysical Research and Aeronomy SB RAS

3. Yu.G. Shafer Institute of Cosmophysical Research and Aeronomy SB RAS

4. Институт солнечно-земной физики СО РАН

5. Institute of Solar Terrestrial Physics SB RAS

6. Международный центр по науке и образованию в области космической погоды, Университет Кюсю

7. International Center for Space Weather Science and Education, Kyushu University

8. Институт геологии и геофизики КАН

9. Institute of Geology and Geophysics CAS

Abstract

Quasi-periodic changes of the geomagnetic field and plasma parameters in the range of Pc 5 pulsations, which occurred immediately after the interaction of interplanetary shock (IPS) with Earth’s magnetosphere in the event of April 24, 2009 at 00:53 UT are examined using ground and satellite observations. The pulsations were localized at latitudes 66–74° in the noon (11 MLT) and evening (20 MLT) sectors. The analysis of hodographs of the geomagnetic field changes both from satellite and ground observations has shown the presence of vortical disturbances. In this event, both the IPS front in the interplanetary medium and the compression wave front in the magnetosphere had a slope in the ZGSM=0 plane; the inclination angle was 14° in the interplanetary medium and 34° in the magnetosphere. The location of the vortical disturbances in the magnetosphere at different radial distances, i.e. X~5.5 Re in the noon sector and X ~–6.3 ÷–7.3 Re in the evening sector, is in agreement with the front inclination. As inferred from satellite observations, the maximum intensity of wave disturbances in both the sectors was registered in the toroidal component of the magnetic field. This suggests the resonant mechanism of excitation of these disturbances. The analysis of distribution of velocities of plasma flow and compression wave front propagation in the magnetosphere’s equatorial plane has revealed that the vortical disturbances occurred in regions where these velocities were noticeably different in magnitude.

Publisher

Infra-M Academic Publishing House

Subject

Space and Planetary Science,Atmospheric Science,Geophysics

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