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arXiv 1912.03384astro-ph.SRphysics.space-ph
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帕克太阳探测器对2019年4月4日太阳高能粒子事件的观测

Observations of the 2019 April 4 Solar Energetic Particle Event at the Parker Solar Probe

R. A. Leske, E. R. Christian, C. M. S. Cohen, A. C. Cummings, A. J. Davis, M. I. Desai, J. Giacalone, M. E. Hill, C. J. Joyce, S. M. Krimigis, A. W. Labrador, O… 展开作者

R. A. Leske, E. R. Christian, C. M. S. Cohen, A. C. Cummings, A. J. Davis, M. I. Desai, J. Giacalone, M. E. Hill, C. J. Joyce, S. M. Krimigis, A. W. Labrador, O. Malandraki, W. H. Matthaeus, D. J. McComas, R. L. McNutt, R. A. Mewaldt, D. G. Mitchell, A. Posner, J. S. Rankin, E. C. Roelof, N. A. Schwadron, E. C. Stone, J. R. Szalay, M. E. Wiedenbeck, A. Vourlidas, S. D. Bale, R. J. MacDowall, M. Pulupa, J. C. Kasper, R. C. Allen, A. W. Case, K. E. Korreck, R. Livi, M. L. Stevens, P. Whittlesey, B. Poduval

摘要:

2019年4月4日,帕克太阳探测器(PSP)上的太阳综合科学调查(ISOIS)仪器套件探测到了一个太阳高能粒子事件,当时航天器位于0.17 au内,距离第二个近日点不到1天,这为研究太阳粒子加速和前所未有的接近源的传输提供了机会。这一事件非常小,峰值1 MeV的质子强度约为0.3个粒子(cm^2 sr s MeV)^-1,在能量超过10 MeV或粒子探测器在1 au的背景水平上都无法探测到。它具有强烈的各向异性,从太阳向外流动的强度比在整个事件中持续向内流动的强度大30倍。由日地关系天文台观测到的极紫外线中粒子增加和小亮度浪涌之间的时间关联,也伴随着PSP电磁场调查所看到的III型无线电发射,表明这一事件的来源是一个活跃地区,位于标称PSP磁足点以东近80度。这表明磁力线在光球层的活动区和日冕之间的一个很宽的纵向范围内扩展。

英文摘要:

A solar energetic particle event was detected by the Integrated Science Investigation of the Sun (ISOIS) instrument suite on Parker Solar Probe (PSP) on 2019 April 4 when the spacecraft was inside of 0.17 au and less than 1 day before its second perihelion, providing an opportunity to study solar particle acceleration and transport unprecedentedly close to the source. The event was very small, with peak 1 MeV proton intensities of ~0.3 particles (cm^2 sr s MeV)^-1, and was undetectable above background levels at energies above 10 MeV or in particle detectors at 1 au. It was strongly anisotropic, with intensities flowing outward from the Sun up to 30 times greater than those flowing inward persisting throughout the event. Temporal association between particle increases and small brightness surges in the extreme-ultraviolet observed by the Solar TErrestrial RElations Observatory, which were also accompanied by type III radio emission seen by the Electromagnetic Fields Investigation on PSP, indicates that the source of this event was an active region nearly 80 degrees east of the nominal PSP magnetic footpoint. This suggests that the field lines expanded over a wide longitudinal range between the active region in the photosphere and the corona.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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