Probable detection of solar neutrons by ground-level neutron monitors during STIP interval 16

Details Probable detection of solar neutrons by ground-level neutron monitors during STIP interval 16 Probable detection of solar neutrons by ground-level neutron monitors during STIP interval 16

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987sici.symp....7s&link_type=abstract

In Alabama Univ., Huntsville. STIP Symposium on Physical Interpretation of Solar/Interplanetary and Cometary Intervals p 7 (SEE

Physics

1

Interplanetary Medium, Neutron Counters, Neutron Emission, Solar Activity, Solar Flares, Solar Neutrons, Atmospheric Attenuation, Gamma Rays, Intervals, Solar Terrestrial Interactions

Scientific paper

The third solar neutron event detected by Earth-orbiting spacecraft was observed during STIP Interval XVI. The solar flare beginning at 2356 UT on 24 April l984 produced a variety of emissions including gamma rays and solar neutrons. The neutrons were observed by the SMM satellite and the neutron-decay protons were observed on the ISEE-3 spacecraft. Between 0000 and 0010 UT on 25 April an increase of 0.7 and 1.7 percent was recorded by neutron monitors at Tokyo (Itabashi) and Morioka, Japan. These stations were located about 42 degrees from the sub-solar point, and consequently, these is approximately 1400 grams of atmosphere between the incident neutrons at the top of the atmosphere and their detection on the Earth's surface. Nevertheless, the time coincidence of a small increase in the total counting rate of two independent neutron monitors indicates the presence of solar neutrons with energies greater than 400 MeV at the top of the Earth's atmosphere. The small increases in the counting rate emphasize the difficulty in identifying similar events using historical neutron monitor data.

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