Journal of Aeronautics & Aerospace Engineering
Open Access
ISSN: 2168-9792
+44-77-2385-9429
ISSN: 2168-9792
+44-77-2385-9429
Rajkumar Hajra
Universit?© dâ?? Orleans, France
Posters & Accepted Abstracts: J Aeronaut Aerospace Eng
High-intensity long-duration continuous AE activity (HILDCAA) events have been shown to be associated mostly with highspeed solar wind streams (HSSs). These geo-effective events, by definition have peak AE intensities >1,000 nT and continue for more than 2 days when AE values do not drop below 200 nT for more than 2 h at a time. The events are caused by the southward component of interplanetary Alfv?©n waves embedded within the HSSs. Recent studies show that HILDCAA events are associated with generation of relativistic (MeV) electron acceleration in the Earthâ??s outer radiation belt. The relativistic electrons are known as â??killer electronsâ? for their hazardous effects to orbiting spacecraft. In the present talk, we will present a detailed study on the geomagnetic characteristics and interplanetary causes of the HILDCAA events as well as the solar cycle and seasonal dependences of the events. It will be shown that the ground-based AE observations during HILDCAAs may potentially be used to predict by >1 day advance the acceleration of radiation belt relativistic electrons at geosynchronous orbit. Relativistic electron acceleration and decay timescales will be provided for wave-particle investigators to attempt to match their models to empirically derived values.
Email: rajkumarhajra@yahoo.co.in