| Issue |
A&A
Volume 468, Number 1, June II 2007
|
|
|---|---|---|
| Page(s) | 289 - 298 | |
| Section | The Sun | |
| DOI | https://doi.org/10.1051/0004-6361:20066247 | |
| Published online | 27 February 2007 | |
Time delay between γ-ray lines and hard X-ray emissions during the 23 July 2002 solar flare interpreted by a trap plus precipitation model
LESIA, Observatoire de Paris, 92195 Meudon Cedex, France e-mail: cyril.dauphin@obspm.fr
Received:
14
August
2006
Accepted:
6
January
2007
Context.The 23 July 2002 event was the first γ-ray flare observed by the Ramaty High Energy Solar Spectroscopic Imager (RHESSI). Analysis of the time profiles of the hard X-ray and gamma-ray radiations of this flare shows a time delay between hard X-ray at 150 keV and gamma ray line emissions.
Aims.We aim to interpret this delay in terms of transport of the particles accelerated during the flare.
Methods.In this paper, we focus on the interpretation of this delay in the context of a trap plus precipitation model for energetic particles.
Results.The time profiles of hard-X-ray and prompt gamma-ray line fluxes can be reproduced given that electrons and ions are injected and partially trapped in different coronal loop systems with slightly different characteristics such as density and length, and that the energetic electron-to-ion ratio varies from peak to peak during the flare.
Conclusions.The results obtained from this analysis are discussed with respect to the constraints provided by the X-ray and gamma-ray images previously obtained, as well as with previously published analysis of the same event
Key words: Sun: flares / Sun: X-rays, gamma rays
© ESO, 2007
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.