The 1990 May 24 Solar Flare and Cosmic Ray Event

• Authors: Kocharov, L.; Kovaltsov, G.; Torsti, J.; Usoskin, I.; Zirin, H.; Anttila, A.; Vainio, R.
• Publication: High Energy Solar Physics, Proceedings of the conference held 16-18 August, 1995 in Greenbelt, MD. Edited by Reuven Ramaty, Natalie Mandzhavidze, and Xin-Min Hua. AIP Conference Proceedings, Vol. 374. Woodbury, NY: American Institute of Physics, 1996., p.246, 1996
• Solar event of 1990 May 24
• Case study / Theoretical study
• ADS link
• Abstract: We have analyzed data on solar protons, neutrons, electrons, gamma-ray, optical and microwave emissions for the 1990 May 24 solar flare. Taking into account high energy neutron and gamma-ray observations, we have suggested two neutron injections occurred during the flare. These two injections are called f- (first) and s- (second). Two components of interacting protons correspondingly existed to produce these neutrons at the Sun. The flare gave also a rise to solar cosmic ray event, which was detected by the neutron monitor network and GOES satellites. Two components of protons were observed in the interplanetary medium (p- (prompt) and d- (delayed) components). A possible spectrum of the s-component of interacting protons coincided with injection spectrum of p-component of interplanetary protons. For this reason, s- and p- components of protons may be considered as different portions of a single population of accelerated particles in the solar corona. The net result is that three proton components (f-, p/s-, and d-) were accelerated during flare process developing from the Sun to the interplanetary medium.