title: Measurements of neutron fluxes with energies from thermal to several MeV in near-Earth space: SINP results.
abstract: Neutron measurement results obtained at SINP MSU since 1970 are presented. These measurements were made using techniques based on neutron moderation and subsequent detection in a Li6I(Eu) crystal or a He3 coronal counter. The measurements were mainly carried out in orbits with inclination of 52 degrees and altitudes of 200-450 km. The spatial and angular distributions of the measured neutron fluxes were studied. The albedo neutron flux was estimated according to the count rate difference for opposite detector orientations towards Earth and away from it. This flux is comparable to the local neutron flux outside the Brazil anomaly region, where local neutrons dominate. Neutron fluxes, generated by solar protons, were detected during a solar flare on June 6, 1991 for the first time. Their spectrum was estimated as a power law with alpha>2.
authors.affiliation: Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia.
authors.forename: P I
authors.initials: PI
authors.lastname: Shavrin
authors.forename: B M
authors.initials: BM
authors.lastname: Kuzhevskij
authors.forename: S N
authors.initials: SN
authors.lastname: Kuznetsov
authors.forename: O Yu
authors.initials: OY
authors.lastname: Nechaev
authors.forename: M I
authors.initials: MI
authors.lastname: Panasyuk
authors.forename: S P
authors.initials: SP
authors.lastname: Ryumin
authors.forename: B Yu
authors.initials: BY
authors.lastname: Yushkov
authors.forename: L S
authors.initials: LS
authors.lastname: Bratolyubova-Tsulukidze
authors.forename: V I
authors.initials: VI
authors.lastname: Lyagushin
authors.forename: Yu L
authors.initials: YL
authors.lastname: Germantsev
mesh_terms: D001267:Atlantic Ocean; D001938:Brazil; D005118:Extraterrestrial Environment; D009502:Neutrons; D011522:Protons; D011834:Radiation Monitoring / Q000295:instrumentation*; D012588:Scintillation Counting; D019445:Solar Activity; D013020:South America; D013026:Space Flight / Q000295:instrumentation*; D018531:Spacecraft / Q000295:instrumentation
chemical_list: D011522:Protons