| Autor: |
Lites, Bruce W., Bruner, E. C., Wolfson, C. J. |
| Zdroj: |
Solar Physics; February 1981, Vol. 69 Issue: 2 p373-389, 17p |
| Abstrakt: |
Several solar flares have been observed from their onset in C IV ? 1548.2 and 1–8 Å X-rays using instruments aboard OSO-8. In addition, microwave and Ha flare patrol data have been obtained for this study. The impulsive brightening in C IV is frequently accompanied by redshifts, interpreted as downflows, of the order of 80 km s-1. The maximum soft X-ray intensity usually arrives several minutes after the maximum C IV intensity. The most energetic C IV event studied shows a small blueshift just before reaching maximum intensity, and estimates of the mass flux associated with this upflow through the transition-zone are consistent with the increase of mass in the coronal loops as observed in soft X-rays. This event had no observable microwave burst, suggesting that electron beams did not play a major role in the chromospheric and transition-zone excitation. Lastly, our observations suggest that the frequent occurrence of violent dynamical processes at the onset of the flare are associated with the initial energy release mechanism. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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