Computer Science – Sound
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986angeo...4...23g&link_type=abstract
Annales Geophysicae (ISSN 0755-0685), vol. 4, Feb. 1986, p. 23-31.
Computer Science
Sound
1
Geomagnetic Pulsations, Magnetohydrodynamics, Plasma Diagnostics, Satellite Observation, Electric Fields, Geos Satellites (Esa), Harmonic Generations, Lines Of Force, Satellite-Borne Instruments, Space Plasmas, Standing Waves
Scientific paper
Unique simultaneous observations of hydromagnetic oscillations were made by GEOS-1 and -2 satellites during October and November 1978. At this time GEOS-1 at apogee came within the close vicinity of GEOS-2, and identical double probe electric field detectors were in operation on both spacecraft. Two periods of wave activity, each with markedly different characteristics were selected for a comparative study. In the first period, data from October 28, 1978 show well defined electric field fluctuations on GEOS-1 which are not observed on GEOS-2. On November 2, 1978 both satellites detect similar electric field oscillations. In an attempt to explain these data, wave frequencies were scaled using plasma data provided by the relaxation sounder on GEOS-2 and the ion mass spectrometers on GEOS-1 and GEOS-2. These scaled frequencies, when compared with theoretical eigenfrequency predictions, indicate a second or third harmonic of the transverse standing wave resonance for the October 28 data and a fundamental or second harmonic for the November 2 data. Examination of the electric and magnetic wave amplitudes leads to the removal of this ambiguity. For October 28 and November 2, the resonant modes can therefore be identified as the second harmonic and fundamental respectively. The relation between the polarizations, amplitudes and frequencies of the signals observed by the two spacecraft is also discussed.
Grard Rejean
Matthews James
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