Temporal development of the energetic particle composition during solar flares
Temporal development of the energetic particle composition during solar flares
复制标题
太阳耀斑期间高能粒子成分的时间发展
DOI：
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发表时间：
1978
期刊：
影响因子：
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通讯作者：
C. Fan
中科院分区：
文献类型：
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作者：
M. Scholer;D. Hovestadt;B. Klecker;G. Gloeckler;C. Fan
在1974年6月9日、7月4日和9月19日的太阳事件中，测量了质子、α粒子、碳、氧和铁离子的强度-时间行为，能量在每核子MeV范围内。虽然在所有三个事件中，每个核子相同能量下的C/O比与时间无关，但在6月和9月事件中，每个核子相同能量下的Fe/O比下降了约1个数量级。对于α与质子的比率测量到类似的降低。这有力地表明，虽然碳和氧基本上完全剥离，但铁核仅部分电离。Fe/O比的变化，然后可以解释为一个平均自由程增加，增加刚度。在1974年7月的事件中，我们观察到α质子比以及Fe/O比随着时间的推移略有增加。这被解释为是由于平均自由程随着刚度的增加而减小。
The intensity-time behavior for protons, alpha particles, and carbon, oxygen, and iron ions has been measured during the June 9, 1974, July 4, 1974, and September 19, 1974, solar events for energies in the MeV per nucleon range. Whereas the C/O ratio at the same energy per nucleon is time independent during all three events shown, the Fe/O ratio at the same energy per nucleon during the June and September events decreases by about 1 order of magnitude. A similar decrease is measured for the alpha to proton ratio. This strongly indicates that while carbon and oxygen are essentially fully stripped, iron nuclei are only partially ionized. The Fe/O ratio changes can then be explained by a mean free path increasing with increasing rigidity. During the July 1974 event we observe a small increase of the alpha to proton ratio as well as the Fe/O ratio with time. This is interpreted as being due to a mean free path decreasing with increasing rigidity.