Physics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.3993h&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A4, April 1, 1992, p. 3993-4008. Research supported by Australian
Physics
13
Boundary Layer Plasmas, Earth Magnetosphere, Geomagnetic Micropulsations, Polar Cusps, Ion Cyclotron Radiation, Magnetohydrodynamic Waves
Scientific paper
A three-station array of induction magnetometers located at high latitudes is used to investigate dayside Pc 1 geomagnetic pulsation bursts. The data set reveals that when these emissions are continually recorded at the Davis latitude, the low-latitude cleft, observed by the DMSP F7 satellite, is located at Davis. Associated magnetic variations in the form of solitary pulses often lead the Pc 1 bursts by 1 to 2 min. These pulses are typically associated with riometer absorption events and consequently the precipitation of fluxes of keV electrons. The Pc 1 bursts are interpreted as resulting from ion cyclotron waves which have propagated to the ionosphere from the equatorial boundary layer region. The associated boundary layer ions, identified by DMSP F7, range between 1 and 5 keV in energy. These particles are argued to the be the most likely free energy source for the ion cyclotron waves.
Fraser Brian J.
Hansen H. J.
Hu Yi-Duo
Meng Ching I.
Menk Frederick W.
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