This investigation shows that statistically there are significant time delays between Ha and hard X-ray (HXR) emissions during solar flares; most impulsive flares produce HXR emissions up to ~ 1 min before and up to 2 min after the onset of Hc~ emission. HXR emissions are also found to be peaked up
Association between gradual hard X-Ray emission and metric continua during large flares
โ Scribed by L. Klein; K. Anderson; M. Pick; G. Trottet; N. Vilmer; S. Kane
- Publisher
- Springer
- Year
- 1983
- Tongue
- English
- Weight
- 723 KB
- Volume
- 84
- Category
- Article
- ISSN
- 0038-0938
No coin nor oath required. For personal study only.
โฆ Synopsis
X-ray radiation is used to study coronal phenomena in conjunction with meter wave observations during some large solar flares. It is found that metric flare continua and moving type IV bursts are associated with gradual and long lasting (a few tens of minutes) microwave and hard X-ray emissions. The detailed temporal analysis reveals that although metric and hard X-ray sources are located at very different heights, both kinds of emission result from a common and continuous/repetitive injection of electrons in the corona. The late part of the metric event (stationary type IV burst) is only associated with soft X-ray radiation. This indicates that the mean energy of the radiating electrons is lower during stationary type IV bursts than during the earlier parts of the event.
๐ SIMILAR VOLUMES
Observational evidence suggests that both the hard X-ray and ultraviolet emission from the impulsive phase of flares result from an electron beam. We present the results of model calculations that are consistent with this theory. The impulsive phase is envisioned as occurring in many small magnetica