Solar Energetic Particles (SEPs) with energies exceeding 10 GeV associated with the 6 November 1997 solar flare/CME (coronal mass ejection) have been detected with Milagrito, a prototype of the Milagro Gamma Ray Observatory. While SEP acceleration beyond 1 GeV is well established, few data exist for protons or ions beyond 10 GeV. The Milagro observatory, a ground based water Cherenkov detector designed for observing very high energy gamma ray sources, can also be used to study the Sun. Milagrito, which operated for approximately one year in 1997/98, was sensitive to solar proton and neutron fluxes above ∼4 GeV. In its scaler mode, Milagrito registered a rate increase coincident with the 6 November 1997 ground level event observed by Climax and other neutron monitors. A preliminary analysis suggests the presence of >10 GeV particles.
Space Science Center, Physics
AIP Conference Proceedings
Digital Object Identifier (DOI)
Detection of 6 November 1997 ground level event by Milagrito Falcone for Milagro collaboration, A. D., AIP Conference Proceedings, 510, 574-578 (2000), DOI:http://dx.doi.org/10.1063/1.1303268
© 2000 American Institute of Physics