26 Apr 2022
26 Apr 2022

Impulse-driven oscillations of the near-Earth’s magnetosphere

Hiroatsu Sato1, Hans Pécseli2,4, Jan Trulsen3, Per Even Sandholt4, and Charles Farrugia5 Hiroatsu Sato et al.
  • 1DLR Institute for Solar-Terrestrial Physics, D-17235 Neustrelitz, Germany
  • 2Department of Physics and Technology, Arctic University of Norway, N-9037 Tromsø, Norway
  • 3Institute of Theoretical Astrophysics, University of Oslo, Boks 1048 Blindern, N-0316 Oslo, Norway
  • 4Department of Physics, University of Oslo, Boks 1029 Blindern, N-0315 Oslo, Norway
  • 5Institute for the Study of Earth, Oceans, and Space, Morse Hall, University of New Hampshire, 8 College Road, Durham, NH, USA

Abstract. It is argued that a simple model based on magnetic image arguments suffices to give a convincing insight into both the basic static as well as dynamic properties of the near-Earth’s magnetosphere. Qualitative results can be obtained for the heating due to the compression of the radiation belts. The properties of this simple dynamic model for the solar wind – magnetosphere interaction are discussed and compared to observations. In spite of its simplicity, the model gives convincing results concerning the magnitudes of the near-Earth’s magnetic and electric fields. The database contains ground based results for magnetic field variation in response to shocks in the solar wind. The observations also include satellite data, here from the two Van Allen satellites.

Hiroatsu Sato et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-232', Anonymous Referee #1, 16 May 2022
    • AC1: 'Reply on RC1', Hans Pecseli, 17 Jun 2022
  • RC2: 'Comment on egusphere-2022-232', Takashi Kikuchi, 31 May 2022
    • AC2: 'Reply on RC2', Hans Pecseli, 30 Jun 2022

Hiroatsu Sato et al.

Hiroatsu Sato et al.


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Short summary
An abrupt increase in pressure associated with interplanetary shocks will compress the magnetic field of the Earth. This leads to a sudden impulse which can be observed also in low-latitude magnetometer records. Such events are followed by heavily damped oscillations of approximately 5 min periods. The general features can be explained by a simple model. Our results are supported by satellite and ground based observations. The results are important for space-weather predictions.