Abstract
Abstract. We present an analysis of double-step magnetic field enhancement caused by interplanetary (IP) shock impacts on the Earth's magnetosphere. The structures were observed by the GOES-8, 10, 11, and 12 spacecraft in the dayside geostationary orbit, particularly during northward interplanetary magnetic field (IMF) conditions. The double-step structures, similar to what is observed in the ground horizontal magnetic field (H) component at low and mid latitudes, were observed preferentially on the dayside. Structures observed around 12–15 magnetic local time (MLT) displayed the steepest initial enhancement step, followed by a magnetic field strength decrease before the second enhancement step. At other dayside MLTs of the geostationary orbit, the initial response was smoother, and no decrease was observed before the second step. We suggest that this MLT asymmetry in the decrease of the total magnetic field is caused by the pushing of the plasmaspheric ions over the geostationary orbit due to the magnetospheric compression.
Highlights
The impact of a fast forward interplanetary (IP) shock leads to significant changes in the near-Earth space environment
The authors discussed the propagation of a fast wave through the Earth’s magnetosphere and its reflection from the inner boundary, such as the plasmapause. It is currently not clear how the magnetic field increases at high latitudes and in the geostationary orbit are related, and, in particular, how geostationary field variations depend on the magnetic local time (MLT) and shock properties
We have studied the response of magnetospheric magnetic fields to IP shocks using a wide MLT coverage of GOES spacecraft in the geostationary orbit
Summary
The impact of a fast forward interplanetary (IP) shock leads to significant changes in the near-Earth space environment. The steep increase of the dynamic pressure at the IP shock (Spreiter and Stahara, 1994; Grib et al, 1979; Grib, 1982; Zhuang et al, 1981) compresses the magnetosphere on a global scale Such compressions are manifested as positive increases of the ground horizontal magnetic field (H ) component at low latitudes (SI: sudden impulse) and increases in the magnetospheric fields in the geostationary orbit (Andréeová et al, 2008). The authors discussed the propagation of a fast wave through the Earth’s magnetosphere and its reflection from the inner boundary, such as the plasmapause It is currently not clear how the magnetic field increases at high latitudes and in the geostationary orbit are related, and, in particular, how geostationary field variations depend on the magnetic local time (MLT) and shock properties.
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