New Solar Neutron Detector and Large Solar Flare Events of June 4th and 6th, 1991.

Muraki, Y.; Sakakibara, S.; Shibata, S.; Satoh, M.; Murakami, Kazuaki; Takahashi, Kazuhiko; Pyle, K. R.; Sakai, Takehiro; Mitsui, K.

doi:10.5636/jgg.47.1073

Cited by 5 publications

(2 citation statements)

References 7 publications

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“…Figure 4a,b show examples of observations received in Mt. Norikura [12,13]. The observation dates are 4 June 1991 (Figure 4a) and 6 June 1991 (Figure 4b), respectively.…”

Section: Introductionmentioning

confidence: 99%

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Detection of Solar Neutrons and Solar Neutron Decay Protons

Muraki,

Koi,

Masuda

et al. 2023

Universe

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Solar flares are broadly classified as impulsive or gradual. Ions accelerated in a gradual flare are thought to be accelerated through a shock acceleration mechanism, but the particle acceleration process in an impulsive flare is still largely unexplored. To understand the acceleration process, it is necessary to measure the high-energy gamma rays and neutrons produced by the impulsive flare. Under such circumstances, on 7 November 2004, a huge X2.0 flare occurred on the solar surface, where ions were accelerated to energies greater than 10 GeV. The accelerated primary protons collided with the solar atmosphere and produced line gamma rays and neutrons. These particles were received as neutrons and line gamma rays, respectively. Neutrons of a few GeV, on the other hand, decay to produce secondary protons while traveling 0.06 au in the solar–terrestrial space. These secondary protons arrive at the magnetopause. Although the flux of secondary protons is very low, the effect of collecting secondary protons arriving in a wide region of the magnetosphere (the Funnel or Horn effect) has resulted in significant signals being received by the solar neutron telescope at Mt. Sierra Negra (4600 m). This information suggests that ions on the solar surface are accelerated to over 10 GeV with an impulsive flare.

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“…Figure 4a,b show examples of observations received in Mt. Norikura [12,13]. The observation dates are 4 June 1991 (Figure 4a) and 6 June 1991 (Figure 4b), respectively.…”

Section: Introductionmentioning

confidence: 99%

“…The second one, Figure 4b, shows that the high-energy electrons and ions were again accelerated in the X10 class flare two days later. The fifth graph from the top is the results observed by the neutron monitor located at Haleakala, Hawaii [13]. At the Mt.…”

Section: Introductionmentioning

confidence: 99%