Physics
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.6633l&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, June 1, 1989, p. 6633-6642.
Physics
8
Earth Ionosphere, Geomagnetic Micropulsations, Geos 1 Satellite, Magnetometers, Gyrofrequency, Helium Ions, Power Spectra
Scientific paper
A Pc 1 event observed by a ground magnetometer network and by GEOS 1 on August 8-9, 1977, between 2325 and 0015 UT is described. It is shown that the waves were generated near or on the GEOS 1 flux tube by hot protons with energies in the 10-20 keV range, injected during a substorm activity. Two frequency components were detected at GEOS 1, one just below and one just above the local He(+) gyrofrequency. The narrow-banded nature and the similarity of the Pc 1 signals observed in space and on ground indicate that the two observation points (which were separated by at least 2.4 hours in local time and four L shells) were observing the same localized source during this interval. It is concluded that the sorce region was localized both in longitude and L shell; on the basis of this conclusion, the attennuation in the signal in the ionospheric duct is estimated to be 0.009-0.014 dB/km.
Cornilleau-Wehrlin Nicole
Hughes Jeffrey W.
Ludlow G. R.
Singer Howard J.
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