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Wideband VLF electromagnetic bursts on the DE 1 satellite
Author(s) -
Sonwalkar Vikas S.,
Helliwell R. A.,
Inan U. S.
Publication year - 1990
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl017i011p01861
Subject(s) - hiss , physics , geomagnetic latitude , satellite , earth's magnetic field , wideband , geophysics , ionosphere , whistler , magnetic field , electromagnetic radiation , very low frequency , magnetosphere , electric field , range (aeronautics) , spacecraft , electron , optics , astronomy , materials science , quantum mechanics , composite material
Wideband VLF electromagnetic bursts are observed on the DE 1 satellite by both the electric and magnetic field sensors in the frequency range of 0.650 kHz to 16.0 kHz. The impulsive signals endure for a relatively short time (∼1 s or less) and exist in the frequency range from well below to well above the local gyrofrequency. They are typically found at L > 4 over a ∼ 40° range of latitudes including the geomagnetic equator and are often accompanied by discrete emissions or a band of hiss. Some observed features are consistent with previous observations of electrostatic plasma waves [ Ondoh et al ., 1989; Reinleitner et al ., 1983]; however, the magnetic measurements clearly indicate that the impulsive signals are electromagnetic in nature, a result that has not been reported before. The possibility of spacecraft discharge effect as the cause of these signals is discussed.