Storm time changes of geomagnetic field at Magsat altitudes (325-550 km) and their comparison with changes at ground locations
Abstract
The values of H, X, Y, and Z at MAGSAT altitudes were first expressed as residuals ΔH, ΔX, ΔY, and ΔZ after subtracting model values HMD, XMD, YMD, and ZMD. The storm time variations of ΔH showed that ΔH (dusk) was larger (negative) than ΔH (dawn) and occurred earlier, indicating a sort of hysteresis effect. Effects at MAGSAT altitudes were roughly the same (10% accuracy) as at ground, indicating that these effects were mostly of magnetospheric origin. The ΔY component also showed large storm time changes. The latitudinal distribution of storm time ΔH showed north-south asymmetries varying in nature as the storm progressed. It seems that the central plane of the storm time magnetospheric ring current undergoes latitudinal meanderings during the course of the storm.
- Publication:
-
Journal of Geophysical Research
- Pub Date:
- February 1985
- DOI:
- 10.1029/JB090iB03p02451
- Bibcode:
- 1985JGR....90.2451K
- Keywords:
-
- Geomagnetism;
- Magnetic Storms;
- Magsat Satellites;
- Temporal Distribution;
- Diurnal Variations;
- Equatorial Atmosphere;
- Latitude;
- Ring Currents;
- Geomagnetism and Paleomagnetism: Geomagnetic induction;
- Geomagnetism and Paleomagnetism: Rapid time variations;
- Geomagnetism and Paleomagnetism: Time variations;
- diurnal to secular