Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-08-23
Astronomy and Astrophysics
Astrophysics
26 pages, 11 figures, accepted by Solar Physics
Scientific paper
10.1007/s11207-006-1977-1
We studied the evolution of two small flares (GOES class C2 and C1) that developed in the same active region with different morphological characteristics: one is extended and the other is compact. We analyzed the accuracy and the consistency of different algorithms implemented in RHESSI software to reconstruct the image of the emitting sources, for energies between 3 and 12 keV. We found that all tested algorithms give consistent results for the peak position whil the other parameters can differ at most by a factor 2. Pixon and Forward-fit generally converge to similar results but Pixon is more reliable for reconstructing a complex source. We investigated the spectral characteristics of the two flares during their evolution in the 3--25 keV energy band. We found that a single thermal model of the photon spectrum is inadequate to fit the observations and we needed to add either a non-thermal model or a hot thermal one.The non-thermal and the double thermal fits are comparable. If we assume a non-thermal model, the non-thermal energy is always higher than the thermal one.Only during the very final decay phase a single thermal model fits fairly well the observed spectrum.
Falchi Ambretta
Maltagliati Luca
Teriaca Luca
No associations
LandOfFree
RHESSI images and spectra of two small flares does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with RHESSI images and spectra of two small flares, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and RHESSI images and spectra of two small flares will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-165568