Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-08-05
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
21 pages, 11 figures, 3 tables, submitted to Solar Physics
Scientific paper
The aim of the present paper is to use quasi-periodic oscillations in hard X-rays (HXRs) of solar flares as a diagnostic tool for investigation of impulsive electron acceleration. We have selected a number of flares which showed quasi-periodic oscillations in hard X-rays and their loop-top sources could be easily recognized in HXR images. We have considered MHD standing waves to explain the observed HXR oscillations. We interpret these HXR oscillations as being due to oscillations of magnetic traps within cusp-like magnetic structures. This is confirmed by a good correlation between periods of the oscillations and the sizes of the loop-top sources. We argue that a model of oscillating magnetic traps is adequate to explain the observations. During the compressions of a trap particles are accelerated, but during its expansions plasma, coming from chromospheric evaporation, fills the trap, which explains the large number of electrons being accelerated during a sequence of strong impulses. The advantage of our model of oscillating magnetic traps is that it can explain both the impulses of electron acceleration and quasi-periodicity of their distribution in time.
Jakimiec Jerzy
Tomczak Matthias
No associations
LandOfFree
Investigation of quasi-periodic varaiations in hard X-rays of solar 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 Investigation of quasi-periodic varaiations in hard X-rays of solar flares, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Investigation of quasi-periodic varaiations in hard X-rays of solar flares will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-254776