Mechanism of formation of Q-disturbances in the F 2 region of the equatorial ionosphere
Autor: | V. Depuev, T. Yu. Leshchinskaya, A. Depueva |
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Rok vydání: | 2008 |
Předmět: | |
Zdroj: | Geomagnetism and Aeronomy. 48:89-97 |
ISSN: | 1555-645X 0016-7932 |
Popis: | Using model simulations, the morphological picture (revealed earlier) of the disturbances in the F2 region of the equatorial ionosphere under quiet geomagnetic conditions (Q-disturbances) is interpreted. It is shown that the observed variations in the velocity of the vertical E × B plasma drift, related to the zonal Ey component of the electric field, are responsible for the formation of Q-disturbances. The plasma recombination at altitudes of the lower part of the F2 region and the dependence of the rate of this process on heliogeophysical conditions compose the mechanism of Q-disturbance formation at night. The daytime positive Q-disturbances are caused exclusively by a decrease in the upward E × B drift, and this type of disturbances could be related to the known phenomenon of counter electrojet. Possible causes of formation of the daytime negative Q-disturbances are discussed. |
Databáze: | OpenAIRE |
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