Storm and Substorm Causes and Effects at Midlatitude Location for the St. Patrick's 2013 and 2015 Events



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Gerrero, A. and Palacios, J. and Rodríguez Bouza, Marta and Rodríguez Bilbao, I. and Aran, A. and Cid, C. and Herraiz, M. and Saiz, E. and Rodríguez Caderot, Gracia and Cerrato, Y. (2017) Storm and Substorm Causes and Effects at Midlatitude Location for the St. Patrick's 2013 and 2015 Events. Journal of Geophysical Research: Space Physics . ISSN 21699380 (In Press)

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Midlatitude locations are unique regions exposed to both geomagnetic storm and substorm effects, which may be superposed on specific events imposing an extra handicap for the analysis and identification of the sources and triggers. We study space weather effects at the midlatitude location of the Iberian Peninsula for the St. Patrick's day events in 2013 and 2015. We have been able to identify and separate storm and substorm effects on ground magnetometer data from San Pablo-Toledo observatory during storm time revealing important contributions of the Substorm Current Wedge on both events. The analysis of these substorm local signatures have shown to be related to the production of effective geomagnetically induced currents and ionospheric disturbances as measured from Global Navigation Satellite Systems data at MAD2 IGS permanent station and not directly related to the storm main phase. The whole Sun-to-Earth chain has been analyzed in order to identify the solar and interplanetary triggers. In both events a high-speed stream (HSS) and a coronal mass ejections (CME) are involved, though for 2015 event, the HSS has merged with the CME, increasing the storm geoeffectiveness. The enhancement of substorm geoeffectiveness is justified by the effects of the inclined magnetic axes of the Sun and of the Earth during equinox period.

Item Type:Article
Uncontrolled Keywords:Interaction of interplanetary structures; Local geomagnetic disturbances; Midlatitude substorm effects.
Subjects:Sciences > Mathematics > Geodesy
ID Code:45319
Deposited On:06 Nov 2017 16:41
Last Modified:10 Nov 2017 11:10

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