UDC 55

Correspondence of a global isolated substorm to the McPherron statistical model

Published в Solnechno-Zemnaya Fizika · Volume 8, Issue 2, 2022 · Pages 41–51 · Rubrics: Results of current research
DOI 10.12737/szf-82202206
Received: 01.12.2021 Accepted: 15.03.2022 Published: 30.06.2022 Language of publication: RUS
Authors
1 Baikal state university (Cathedra Mathematical Methods and Information Tecnologes, professor)
from 01.01.1975 to 01.01.2021 Irkutsk, Irkutsk region, Russian Federation
2 Institute of Solar Terrestrial Physics SB RAS
Irkutsk, Russian Federation
3 Institute of Solar Terrestrial Physics SB RAS
Irkutsk, Russian Federation
4 Institute of Astronomy and Geophysics AS Mongolia
Ulaanbaatar, Mongolia
5 Institute of Cosmophysical Research and Radio Wave Propagation FEB RAS
Paratunka, Kamchatka, Russian Federation
6 Sodankylä Geophysical Observatory
Sodankyulya, Finland
7 Baikal State University
Irkutsk, Russian Federation
8 Polar Geophysical Institute
Apatity, Russian Federation
9 Polar Geophysical Institute RAS
Apatity, Russian Federation
10 Institute of Solar Terrestrial Physics SB RAS
Irkutsk, Russian Federation
It is shown that a diamagnetic structure (DS) of the slow solar wind (SW), the source of which on the Sun was a chain of streamers, arrived at Earth’s orbit on December 22, 2015. It interacted with Earth’s magnetosphere under conditions when the northward Bz component of the interplanetary magnetic field (IMF) remained for a long time in preceding undisturbed SW. The interaction and a sharp change in the direction of Bz to the south generated an isolated substorm whose duration depends on the duration of interaction with the DS. The substorm began at midday with the passage of the DS into the magnetosphere and spread to the east. All phases of the substorm — growth, expansion, and recovery — were observed for two hours. Variations in the SW and IMF parameters are shown to coincide for the isolated substorm whose energy source was the slow solar wind DS, and a trigger was the abrupt change in the direction of the vertical IMF component from north to south. The coincidence is justified by statistical generalizations of the same parameters in 40 % of cases of long-term observations of individual substorms whose trigger was a change in Bz direction.
diamagnetic structure global isolated substorm change in the Bz direction trigge
Funding
The work of V.A. Parkhomov was carried out as part of the state-sponsored research topic of BSU for 2021–2022 “System Analysis and Data Processing Methods in Space Research”. The work of V.G. Eselevich and M.G. Eselevich was financially supported by the Ministry of Science and Higher Education of the Russian Federation. The work of Tsegmed B. was fi-nancially supported by the Academy of Sciences of Mongolia (Grant No. SHUAG_2017/17) and by the Ministry of Education, Science and Sports of Mongolia (project No. SHUSS-2017/65); the work of Khomutov S.Yu. was financially supported by the project “Physical Processes in the System of Near Space and Geospheres under Solar and Lithospheric Effects”, No. AAAA-A21-121011290003-0. Measurements with induction magnetometers of the Paratunka Observatory are carried out within the framework of the “Agreement on Academic Exchange between IKIR FEB RAS and Nagoya Research Institute (Japan)” with support from the PWING project (JSPS KAKENHI 16H06286)
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