Institutions:
1 - Geological Faculty of Lomonosov Moscow State University, Moscow, Russia.
2 - E.K. Fedorov Institute of Applied Geophysics (IPG), Moscow, Russia
3 - Giprostroymost-Geotech LLC, Moscow, Russia
Abstract
The article presents the results of a comparative analysis of variations in the total magnetic field vector in geostationary orbit according to data from the Russian Electro-L spacecraft No. 4 (position 76° east) and foreign spacecraft GOES-16 (104.7° west) and GOES-18 (137° west.). The initial data of the FM-E and MAG magnetometers are reduced to a single format with minute resolution, filtering of daily and high-frequency variations is performed. By the method of mutual correlation, time shifts between the signals of the satellites have been established, amounting to 2 to 6 hours, which are explained by the differences in local magnetic time (MLT). It is shown that the high-frequency component of the field (periods less than 12 hours) is well-agreed on all three vehicles, especially during periods of geomagnetic disturbances, whereas the daily variations and response to magnetic storms significantly depend on the longitude position of the spacecraft. Using the example of the storm of June 14-17, 2023, it was revealed that GOES-16 and GOES-18 demonstrate an increase in the field in the initial phase, while Electro-L No. 4 reacts with a decrease, indicating the asymmetry of the magnetosphere. These results highlight the importance of considering the satellite's position when interpreting data and making space weather forecasts.
Keywords: SPACECRAFT, MAGNETOMETRY, EARTH'S MAGNETIC FIELD, MAGNETIC FIELD VARIATIONS, GEOSTATIONARY ORBIT.
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