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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 25, issue 2
Ann. Geophys., 25, 483-493, 2007
https://doi.org/10.5194/angeo-25-483-2007
© Author(s) 2007. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 25, 483-493, 2007
https://doi.org/10.5194/angeo-25-483-2007
© Author(s) 2007. This work is distributed under
the Creative Commons Attribution 3.0 License.

  08 Mar 2007

08 Mar 2007

Synchronous NmF2 and NmE daytime variations as a key to the mechanism of quiet-time F2-layer disturbances

A. V. Mikhailov, V. H. Depuev, and A. H. Depueva A. V. Mikhailov et al.
  • Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Troitsk, Moscow Region 142190, Russia

Abstract. The observed NmF2 and NmE variations were analyzed for the periods of positive and negative quiet-time F2-layer disturbances (Q-disturbances) observed in the midlatitude daytime F2-layer to specify the mechanism of their origin. The noontime δNmF2 and δNmE deviations demonstrate a synchronous type of variation which can be explained by vertical gas motion in the thermosphere. This neutral gas motion should result in atomic abundance variations, the latter being confirmed by the Millstone Hill ISR observations for periods of positive and negative Q-disturbance events. The analysis of the ISR data has shown that atomic oxygen concentration variations are the main cause of the daytime F2-layer Q-disturbances. The auroral heating which controls the poleward thermospheric wind is considered to be the basic mechanism for the Q-disturbances, however, the specific mechanisms of positive and negative Q-disturbances are different. Some morphological features of the Q-disturbances revealed earlier are explained in the scope of the proposed concept.

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