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Solar particle events with helium-over-hydrogen enhancement in the energy range up to 100 MeV nucl−1

机译：在能量范围高达100 MeV nucl-1的情况下，氦气中氢过剩增强的太阳粒子事件

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摘要

Flux measurements of solar energetic particles (SEPs) in the ERNE instrument onboard SOHO indicate that the abundance of 4He-nuclei compared to protons in the energy range up to 100 MeV nucl−1 was exceptionally high during the particle events on 27 May 1998 and 28 December 1999. The 4He/p ratio stayed between 0.15–0.50 for more than ten hours. There was also a prolonged enhancement in helium-3, 3He/4H ≈1%. Observations of EIT and LASCO on board SOHO confirm that the originators of both SEP events were western eruptions, flares and coronal mass ejections (CMEs). The onset of the SEP release took place close to the maximum of flares which were probably triggered by the rising CMEs. The observations suggest that the SEP events were started with the flare-(pre)accelerated particles, but impact of the CME-associated shocks might explain the continuation and modification of the helium and proton fluxes well after the flare production. These observations support the idea that the helium enhancements in the CME-associated events reflect the availability of seed particles that originate previously in flares.
机译：在SOHO上的ERNE仪器中对太阳高能粒子（SEP）的通量测量表明，在能量范围高达100 MeV nucl-1 的情况下，相比于质子，4 Hes核的丰度异常高这是1998年5月27日和1999年12月28日的粒子事件。4 He / p比值在0.15-0.50之间保持了十多个小时。氦3、3 He / 4 H≈1％的时间也延长了。 SOHO上EIT和LASCO的观测结果证实，这两次SEP事件的发起者都是西方爆发，耀斑和冠状物质抛射（CME）。 SEP释放的爆发接近于可能由CME上升引起的最大火炬爆发。观测结果表明，SEP事件始于火炬加速（预）加速的粒子，但是CME相关冲击的影响可能解释了火炬产生后氦气和质子通量的持续和变化。这些观察结果支持这样的想法，即CME相关事件中氦气的增强反映了先前起源于火炬的种子颗粒的可用性。

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  • 来源
    《Solar Physics》 |2002年第1期|123-147|共25页
  • 作者

    J. Torsti; L. Kocharov; J. Laivola; S. Pohjolainen; S.P. Plunkett; B.J. Thompson; M.L. Kaiser; M.J. Reiner;

  • 作者单位

    Space Research Laboratory Department of Physics University of Turku;

    Space Research Laboratory Department of Physics University of Turku;

    Space Research Laboratory Department of Physics University of Turku;

    Tuorla Observatory University of Turku;

    Naval Research Laboratory Universities Space Research Association;

    NASA Goddard Space Flight Center;

    NASA Goddard Space Flight Center;

    Raytheon ITSS;

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