Publication Date:
2014-05-02
Description:
In this paper we study the planetary magnetic disturbance during the magnetic storm occurring on 05 April 2010 associated with high speed solar wind stream due to a coronal hole following a CME. We separate the magnetic disturbance associated to the ionospheric disturbance dynamo (Ddyn) from the magnetic disturbance associated to the prompt penetration of magnetospheric electric field (DP2). This event exhibits different responses of ionospheric disturbance dynamo in the different longitude sectors (European-African, Asian and American). The strongest effect is observed in the European-African sector. The Ddyn disturbance reduces the amplitude of the daytime H-component at low latitudes during four consecutive days in agreement with the Blanc and Richmond's model of ionospheric disturbance dynamo. The amplitude of Ddyn decreased with time during the four days. We discuss its diverse worldwide effects. The observed signature of magnetic disturbance process in specific longitude sector is strongly dependent on which Earth's side faces the magnetic storms (i.e., there is a different response depending on which longitude sector is at noon when the SSC hits).Finally we determined an average period of 22 hours for Ddyn using wavelet analysis.
Print ISSN:
0148-0227
Topics:
Geosciences
,
Physics
