Pc3 activity at low geomagnetic latitudes - A comparison with solar wind observations

Details Pc3 activity at low geomagnetic latitudes - A comparison with solar wind observations Pc3 activity at low geomagnetic latitudes - A comparison with solar wind observations

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992p%26ss...40.1399v&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 40, no. 10, p. 1399-1408.

Computer Science

4

Geomagnetic Latitude, Geomagnetic Pulsations, Interplanetary Magnetic Fields, Interplanetary Medium, Solar Wind Velocity, Daytime, Earth Magnetosphere, Energy Transfer

Scientific paper

On an hourly time-scale the different roles of the solar wind and interplanetary magnetic field (IMF) parameters on ground micropulsation activity can be better investigated than at longer time-scales. A long-term comparison between ground measurements made at L'Aquila and IMP 8 observations confirms the solar wind speed as the key parameter for the onset of pulsations even at low latitudes, although additional control of the energy transfer from the interplanetary medium to the earth's magnetosphere is clearly exerted by the cone angle. Above about 20 mHz the frequency of pulsations is confirmed to be closely related to the IMF magnitude while, in agreement with model predictions, the IMF magnitude is related to the amplitude of the local fundamental resonant mode. We provide an interesting example in which high resolution measurements simultaneously obtained in the foreshock region and on the ground show that external transversal fluctuations do not penetrate deep into the low latitude magnetosphere.

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