Implications Of The Magnetic Structure Of Magnetic Clouds For Their Interaction With The Terrestrial Bow Shock And The Magnetopause, IAU Symposium 335: space weather of the heliosphere: processes and forecasts - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2017

Implications Of The Magnetic Structure Of Magnetic Clouds For Their Interaction With The Terrestrial Bow Shock And The Magnetopause, IAU Symposium 335: space weather of the heliosphere: processes and forecasts

Dominique Fontaine
Lucile Turc
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Résumé

Magnetic clouds are very geoeffective solar events capable to trigger strong magnetic storms in the terrestrial magnetosphere. However their interaction with the magnetosphere and their level of geoeffectivity are not yet fully understood. Some effects as the occurrence of other events (jets, shocks, other clouds, …) in the immediate surroundings of the clouds are known to affects their geoeffectivity. We present here additional effects capable to modify their geoeffectivity which are directly related to the interaction of the clouds with the terrestrial environment. From observations and simulations, we have shown that the quasi-perpendicular or quasi-parallel configuration of the clouds at the bow shock preserves or changes the cloud’s magnetic structure downstream of the bow shock. In order to estimate further the consequences of these effects for the clouds’ interaction with the magnetophere, we run 3D hybrid simulations of the interaction of a magnetic cloud with the Earth’s bow shock. We investigate the plasma and field distributions downstream of the bow shock and next to the magnetopause. We examine their role in triggering crucial processes for the magnetospheric activity as magnetic reconnection and surface instabilities. We compare the effects obtained for both quasi-perpendicular and quasi-parallel configurations at the bow shock.
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hal-02796702 , version 1 (05-06-2020)

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  • HAL Id : hal-02796702 , version 1

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Dominique Fontaine, Lucile Turc. Implications Of The Magnetic Structure Of Magnetic Clouds For Their Interaction With The Terrestrial Bow Shock And The Magnetopause, IAU Symposium 335: space weather of the heliosphere: processes and forecasts. IAU Symposium 335: space weather of the heliosphere: processes and forecasts, Jul 2017, Exceter, Great Britain, Unknown Region. ⟨hal-02796702⟩
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