Comparison of ground-based and satellite geomagnetic pulsations during substorms
| 1Kozak, LV, 1Petrenko, BA, 2Grigorenko, EE, 3Kronberg, EA 1Taras Shevchenko National University of Kyiv, Kyiv, Ukraine 2Russian Space Research Institute, Moscow, Russia 3Max Planck Institute, Göttingen, Germany |
| Kinemat. fiz. nebesnyh tel (Online) 2022, 38(1):3-15 |
| https://doi.org/10.15407/kfnt2022.01.003 |
| Start Page: Dynamics and Physics of Solar System Bodies |
| Language: Ukrainian |
Abstract: A comparison was conducted between magnetic field pulsations in the magnetosphere and its time of detection and location on Earth’s surface. For analysis we used measurements of magnetic field fluctuations from Cluster 2 mission feroprobe magnetometers, as well as ground-based magnetometers data in the auroral oval. We analyzed events during at the 13th of August 2019. In particular, two substorms and flapping motions of the magnetotail current sheet were analyzed. Ground-based facilities, from which data was collected, were selected using a visual location of spacecraft and related geomagnetic tail field lines (3DView). Continuous wavelet transform was used in order to distinguish geomagnetic pulsations. For estimation of pulsation type and observable contrast between magnetotail and auroral oval detected fluctuations, an integrated consideration was used in two frequency ranges: 45...150 seconds (Рс4/Рі2) and 150...600 seconds (Рс5/Рі3). Correlated Pi2 and Pc5 pulsations were detected in the aurora region and in the magnetotail. The magnitude of detected pulsations depends on the relative location of the surface magnetometers and spacecraft magnetic field line projection. Analyzing the delays between the detection of peak geomagnetic fluctuations by surface magnetometers and their detection by spacecraft in the magnetosphere allowed us to determine the velocity of the perturbations along the magnetic field line. |
| Keywords: current sheet fluctuations, Earth magnetotail, geomagnetic pulsations, pulsations in the aurora region, substorms |
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