Physics
Scientific paper
Oct 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cosre..47..361s&link_type=abstract
Cosmic Research, Volume 47, Issue 5, pp.361-367
Physics
Polar Cap Ionosphere
Scientific paper
Dynamics of changes of the electric fields in the daytime and nighttime sectors of the high-latitude ionosphere is studied. The following facts are demonstrated: ( a) With the onset of active phases of substorms, a decrease occurs in the value of the electric potential difference in the daytime sector. It is especially abrupt with the onset of the expansion phase, which is related to a decrease and the end of reconnection at the dayside magnetopause. ( b) With the onset of active phases of substorms, an increase in the value of the electric potential difference in the nighttime sector occurs. It is sharply intensified with the onset of the expansion phase, this fact being caused by the intensification of the reconnection in the nighttime magnetotail. ( c) There exists a relation, close to a functional dependence, between the values of the electric potential differences in the nighttime sector and | AL | index.
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