Other
Scientific paper
Apr 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008phdt.........7a&link_type=abstract
TDX, Tesis en Xarxa
Other
1
Sun: Coronal Mass Ejections (Cmes), Sun: Flares, Sun: Particle Emission
Scientific paper
We have developed a Monte Carlo model to simulate the transport of solar near-relativistic (NR; 30-300 keV) electrons along the interplanetary magnetic field (IMF), including adiabatic focusing, pitch-angle dependent scattering, and solar wind effects. By taking into account the angular response of the LEFS60 telescope of the EPAM experiment on board the "Advanced Composition Explorer" spacecraft, we have been able to transform simulated pitch-angle distributions into sectored intensities measured by the telescope. We have developed an algorithm that allows us, for the first time, to infer the best-fit transport conditions and the underlying solar injection profile of NR electrons from the deconvolution of observational sectored intensities. We have studied seven NR electron events observed by the LEFS60 telescope between 1998 and 2004 with the aim of estimating the roles that solar flares and CME-driven shocks play in the acceleration and injection of NR electrons, as well as the conditions of the electron transport along the IMF.
In this set of seven NR electron events, we have identified two types of injection episodes in the derived injection profiles: short (< 15 min) and time-extended (> 1 h). The injection profile of three events shows both components; an initial injection episode of short duration, followed by a second much longer lasting episode; two events only show a time-extended injection episode; while the others show an injection profile composed by several short injection episodes.
By comparing the timing of the injection with the associated electromagnetic emissions at the Sun, we have concluded that short injection episodes are preferentially associated with the injection of flare-accelerated particles, while longer lasting episodes are provided by CME-driven shocks.
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