Studies of a cusp-region hydromagnetic wave event with magnetometers and incoherent scatter radar
Abstract
A large-amplitude (100 nT) low frequency (0.002 Hz) hydromagnetic wave event was measured with magnetometers at three sites in conjugate areas near the magnetospheric cusp regions and with an incoherent scatter radar (ISR) at one site (Sondre Stromfjord). The magnetic signatures of the event showed good conjugacy between South Pole and Frobisher Bay (near-conjugate stations). A linear polarization was observed at the stations at the time of occurrence of the maximum amplitude of the event. The measured magnetic field variation amplitudes in the north-south direction were well-predicted by calculations based upon the ISR determinations of the ionospheric electric fields; the observed magnetic variations in the east-west direction were not well predicted. The ISR results give a good measure of the ionospheric ion heating produced by such a large-amplitude hydromagnetic wave event.
- Publication:
-
Annales Geophysicae
- Pub Date:
- December 1987
- Bibcode:
- 1987AnGeo...5..479L
- Keywords:
-
- Incoherent Scatter Radar;
- Magnetohydrodynamic Waves;
- Magnetometers;
- Polar Cusps;
- Geomagnetism;
- Magnetosphere-Ionosphere Coupling