Mechanism of formation of Q-disturbances in the F 2 region of the equatorial ionosphere

Autor: V. Depuev, T. Yu. Leshchinskaya, A. Depueva
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
Externí odkaz: