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Title:
The X-ray Detectability of Electron Beams Escaping from the Sun
Authors:
Saint-Hilaire, Pascal; Krucker, Säm; Christe, Steven; Lin, Robert P.
Affiliation:
AA(Space Sciences Laboratory, University of California, Berkeley, CA 94720, USA ), AB(Space Sciences Laboratory, University of California, Berkeley, CA 94720, USA), AC(Space Sciences Laboratory, University of California, Berkeley, CA 94720, USA), AD(Space Sciences Laboratory, University of California, Berkeley, CA 94720, USA)
Publication:
The Astrophysical Journal, Volume 696, Issue 1, pp. 941-952 (2009). (ApJ Homepage)
Publication Date:
05/2009
Origin:
IOP
ApJ Keywords:
Sun: flares, Sun: particle emission, Sun: X-rays, gamma rays
DOI:
10.1088/0004-637X/696/1/941
Bibliographic Code:
2009ApJ...696..941S

Abstract

We study the detectability and characterization of electron beams as they leave their acceleration site in the low corona toward interplanetary space through their nonthermal X-ray bremsstrahlung emission. We demonstrate that the largest interplanetary electron beams (gsim1035 electrons above 10 keV) can be detected in X-rays with current and future instrumentation, such as RHESSI or the X-Ray Telescope (XRT) onboard Hinode. We make a list of optimal observing conditions and beam characteristics. Amongst others, good imaging (as opposed to mere localization or detection in spatially integrated data) is required for proper characterization, putting the requirement on the number of escaping electrons (above 10 keV) to gsim3 × 1036 for RHESSI, gsim3 × 1035 for Hinode/XRT, and gsim1033 electrons for the FOXSI sounding rocket scheduled to fly in 2011. Moreover, we have found that simple modeling hints at the possibility that coronal soft X-ray jets could be the result of local heating by propagating electron beams.
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