Physics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990angeo...8..589w&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 8, Sept. 1990, p. 589-598.
Physics
1
Auroral Zones, Eiscat Radar System (Europe), F Region, Ionospheric Electron Density, Night Sky, Space Plasmas, Auroral Ionization, Electron Precipitation, Magnetic Disturbances
Scientific paper
EISCAT CP1 and CP3 observations are combined to give a temporal description of auroral blobs. The results show a possible overall physical picture of the enhancements in the nighttime sector at auroral latitudes. It is found that auroral blobs are produced locally at high latitude, poleward of the auroral boundaries, especially at the Harang discontinuity where plasma velocities are so small that precipitating particles have enough time to build up ionizations and to heat them to high temperatures. Then, the enhancements at lower altitudes with high electron temperatures drift to low latitudes following the background plasma convections. During this motion, their height is gradually elevated by equatorward neutral winds, and their electron temperature decreases because of the increasing energy loss of electrons as they move out of the source region.
Chen Pei-Ren
Schlegel Kristian
Wang Wen-Bin
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