On the standing wave mode of giant pulsations
- Johns Hopkins Univ., Laurel, MD (United States)
- National Institute of Polar Research, Tokyo (Japan)
- Technische Univ. Braunschweig (Germany)
- Aerospace Corp., El Segundo, CA (United States)
- Tokai Univ., Hiratsuka (Japan)
Both odd-mode and even-mode standing were structures have been proposed for giant pulsations. Unless a conclusion is drawn on the field-aligned mode structure, little progress can be made in understanding the excitation mechanism of giant pulsations. In order to determine the standing wave mode, the authors have made a systematic survey of magnetic field data from the AMPTE CCE spacecraft and from ground stations located near the geomagnetic foot point of CCE. They selected time intervals when CCE was close to the magnetic equator and also magnetically close to Syowa and stations in Iceland, and when either transverse or compressional Pc 4 waves were observed at CCE. Magnetograms from the ground stations were then examined to determine if there was a giant pulsation was observed in association with transverse wave events. The CCE magnetic field record for the giant pulsation exhibited a remarkable similarity to a giant pulsation observed from the ATS 6 geostationary satellite near the magnetic equator (Hillebrand et at., 1982). In agreement with Hillebrand et al., they conclude that the compressional nature of the giant pulsation is due to an odd-mode standing wave structure. This conclusion places a strong constraint on the generation mechanism of giant pulsations.
- OSTI ID:
- 7258991
- Journal Information:
- Journal of Geophysical Research; (United States), Vol. 97:A7; ISSN 0148-0227
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
EARTH MAGNETOSPHERE
HYDROMAGNETIC WAVES
GEOMAGNETIC EQUATOR
GEOMAGNETIC FIELD
GROUND LEVEL
LATITUDE EFFECT
SATELLITES
STANDING WAVES
EARTH ATMOSPHERE
GEOGRAPHICAL VARIATIONS
LEVELS
MAGNETIC FIELDS
VARIATIONS
661320* - Auroral
Ionospheric
& Magnetospheric Phenomena- (1992-)