| タイトル | Gas dynamics in the impulsive phase of solar flares. I Thick-target heating by nonthermal electrons |
| 著者（英） | Emslie, A. G.; Nagai, F. |
| 著者所属（英） | Alabama Univ. |
| 発行日 | 1984-04-15 |
| 言語 | eng |
| 内容記述 | A numerical investigation is carried out of the gas dynamical response of the solar atmosphere to a flare energy input in the form of precipitating nonthermal electrons. Rather than discussing the origin of these electrons, the spectral and temporal characteristics of the injected flux are inferred through a thick-target model of hard X-ray bremsstrahlung production. It is assumed that the electrons spiral about preexisting magnetic field lines, making it possible for a one-dimensional spatial treatment to be performed. It is also assumed that all electron energy losses are due to Coulomb collisions with ambient particles; that is, return-current ohmic effects and collective plasma processes are neglected. The results are contrasted with earlier work on conductive heating of the flare atmosphere. A local temperature peak is seen at a height of approximately 1500 km above the photosphere. This derives from a spatial maximum in the energy deposition rate from an electron beam. It is noted that such a feature is not present in conductively heated models. The associated localized region of high pressure drives material both upward and downward. |
| NASA分類 | SOLAR PHYSICS |
| レポートNO | 84A33600 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/398167 |
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