منابع مشابه
Results from the Yohkoh
The Japanese sun observing satellite, Yohkoh, has been operational for ve years and her scientiic instruments are still in good condition. They have revealed ample of evidences that solar ares were triggered by magnetic reconnection, which was, for the rst time, clearly indicated to take place in the solar corona. Cusp structures in soft X-rays and a new type of hard X-ray sources at the top of...
متن کاملYohkoh and Non-thermality in Flares
The Yohkoh observatory carries X-ray instrumentation capable of almost de nitive are observations within its resolution limits of a few arc seconds. The data con rm the energetic predominance of the impulsive phase in are development, interpreting this phase as the epoch of non-thermality (the heating process). The clues include the behavior of sources at the feet of coronal loops, including ha...
متن کاملYohkoh Observations of White-light Flares
The Aspect Camera on the Soft X-ray Telescope (SXT) on Yohkoh has provided a unique database of white-light ares (WLFs). Coincident HXR and SXR observations give a unique opportunity to study the relationship between these diierent emissions and investigate the origins of the white-light emission. We have found that the spatial and temporal coincidence between impulsive white-light and HXR emis...
متن کاملYOHKOH remnants: partially occulted flares in hard X-rays
Context. Modern solar X-ray imagers did not breakthrough the problem of detailed diagnostics of faint hard X-ray sources in the presence of stronger ones. This is the case of the impulsive phase of solar flares in which footpoint sources are usually stronger than loop-top ones. Aims. For this aim, flares being partially occulted by the solar limb, are the best reservoir of our knowledge about h...
متن کاملSunlight and Vitamin D
Vitamin D is the sunshine vitamin that has been produced on this earth for more than 500 million years. During exposure to sunlight 7-dehydrocholesterol in the skin absorbs UV B radiation and is converted to previtamin D3 which in turn isomerizes into vitamin D3. Previtamin D3 and vitamin D3 also absorb UV B radiation and are converted into a variety of photoproducts some of which have unique b...
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ژورنال
عنوان ژورنال: Nature
سال: 1993
ISSN: 0028-0836,1476-4687
DOI: 10.1038/362496a0