Physics – Plasma Physics
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jgr...10110965p&link_type=abstract
Journal of Geophysical Research, Volume 101, Issue A5, p. 10965-10974
Physics
Plasma Physics
16
Magnetospheric Physics: Mhd Waves And Instabilities, Geomagnetism And Paleomagnetism: Rapid Time Variations, Space Plasma Physics: Waves And Instabilities, Ionosphere: Polar Cap Ionosphere
Scientific paper
Analysis of magnetospheric Pc 1 and Pc 2 (in brief Pc 1-2) pulsations at a network of six northern hemisphere stations at latitudes 65°-76° CGM shows that their average frequency decreases with increasing latitude of the station. Their maximum occurrence is at L=6-9 and 1200-1600 LT. The ionospheric ducting is weak for f<0.3 Hz. Occasionally the Pc 1 intensity at a station is modulated by a simultaneously arriving quasi-periodic Pc 4-5 signal. A mechanism for generating micropulsation which is common to both high-frequency and low-frequency waves is presented and discussed, the proposed mechanism being that a broadband signal from the solar wind is amplified in the magnetosphere in the frequency bands of the field line resonance (Pc 4-5) and in the He+ cyclotron frequency (Pc 1-2) range.
Green Andrew W.
Kangas Jorma
Molchanov Oleg A.
Mursula Kalevi
Plyasova-Bakounina T. A.
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