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Filters: Author is Osmane, A.  [Clear All Filters]
Authors: Kilpua E. K. J., Turner D. L., Jaynes A. N., Hietala H., Koskinen H. E. J., et al.
Title: Outer Van Allen Radiation Belt Response to Interacting Interplanetary Coronal Mass Ejections
Abstract: We study the response of the outer Van Allen radiation belt during an intense magnetic storm on 15–22 February 2014. Four interplanetary coronal mass ejections (ICMEs) arrived at Earth, of which the three last ones were interacting. Using data from the Van Allen Probes, we report the first detailed investigation of electron fluxes from source (tens of kiloelectron volts) to core (megaelectron volts) energies and possible loss and acceleration mechanisms as a response to substructures (shock, sheath and ejecta, and regions of shock‐compressed ejecta) in multiple interacting ICMEs. After an initial enhancement induced by a shock compression of the magnetosphere, core fluxes strongly depleted and stayed low for 4 days. This sustained depletion can be related to a sequence of ICME substruc. . .
Date: 03/2019 Publisher: Journal of Geophysical Research: Space Physics Pages: 1927 - 1947 DOI: 10.1029/2018JA026238 Available at:
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Authors: Osmane A., and Pulkkinen T. I.
Title: On the threshold energization of radiation belt electrons by double layers
Abstract: Using a Hamiltonian approach, we quantify the energization threshold of electrons interacting with radiation belts' double layers discovered by Mozer et al. (2013). We find that double layers with electric field amplitude E0 ranging between 10 and 100 mV/m and spatial scales of the order of few Debye lengths are very efficient in energizing electrons with initial velocities v∥ ≤ vth to 1 keV levels but are unable to energize electrons with E ≥ 100 keV. Our results indicate that the localized electric field associated with the double layers are unlikely to generate a seed population of 100 keV necessary for a plethora of relativistic acceleration mechanisms and additional transport to higher energetic levels.
Date: 10/2014 Publisher: Journal of Geophysical Research: Space Physics DOI: 10.1002/2014JA020236 Available at:
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