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首页> 外文会议>International Cosmic Ray Conference >Observation of He+ Increase in Solar Energetic Particle Events with a High Source Temperature and Implication for Acceleration Site
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Observation of He+ Increase in Solar Energetic Particle Events with a High Source Temperature and Implication for Acceleration Site

机译：高源温度下太阳能粒子事件中He +的增加及其对加速场的影响

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Ionic charge state studies of Solar Energetic Particle (SEP) events have indicated Q QFe = ~9-12 below ~0.1 MeV/nuc for both impulsive and gradual events, which would be consistent with a source of normal coronal temperature of 1-3 MK. However, QFe >16 are often found in solar wind in association with solar activity, which suggests the existence of source distributions with a higher temperature. Using data from ACE SEPICA during the time period 1998-2000, we have observed SEP events with a highly charged iron population even at low SEP energies, consistent with a high temperature source. Four of these highly charged SEP events show QFe > 14 throughout SEPICA energy range with no energy dependence of the charge states. To find out how and where such a highly charged source population is accelerated to SEP energies we have looked for indicators of their acceleration site. In particular, we have found that all four events show a substantially enhanced abundance in He+ at 0.25–0.7 MeV/nuc, compared with normal solar wind abundances. Such abundance enhancements of He+ Fe Keyword Keywords: Solar Energetic Particle Events; Charge State; Composition have previously been related to the acceleration of interstellar pick up ions to SEP energies in interplanetary space. Therefore, this finding indicates an association of the high charge state SEP events with interplanetary acceleration.
机译：太阳高能粒子（SEP）事件的离子电荷状态研究表明，脉冲和渐进事件的Q QFe =〜9-12均低于〜0.1 MeV / nuc，这与1-3 MK的正常日冕温度相一致。然而，经常在太阳风中发现QFe> 16与太阳活动有关，这表明存在较高温度的源分布。使用ACE SEPICA在1998-2000年期间的数据，我们观察到即使在低SEP能量下，铁电荷较高的SEP事件，也与高温源一致。这些高电荷SEP事件中的四个在整个SEPICA能量范围内显示QFe> 14，而与电荷状态的能量无关。为了找出如何以及在何处将如此高电荷的源人口加速为SEP能量，我们寻找了其加速站点的指标。特别是，我们发现，与正常的太阳风丰度相比，所有四个事件在0.25-0.7 MeV / nuc的He +中都显示出显着增强的He +丰度。 He + Fe的丰度提高。充电状态；之前的成分与星际吸收离子加速到行星际空间中SEP能量有关。因此，该发现表明高电荷状态SEP事件与行星际加速度之间的关联。

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