In this paper we report on the energy spectra and abundance ratios of hydrogen and helium isotopes of albedo origin, measured by the instruments NINA and NINA-2 ïn near-equatorial regions. The instrument NINA flew on board the satellite Resurs-01-N4 between 1998 and 1999, at a 830 km average altitude. The NINA-2 apparatus, on board the satellite MITA, was put into orbit in July 2000 at an altitude of about 450 km. NINA and NINA-2 measurements revealed that 2H, 3H, 3He, and 4He are a significant portion of the secondary flux above the atmosphere. The energy spectra of hydrogen isotopes are practically flat across the energy range of 10-40 MeV/n, while the spectra of helium isotopes can be fitted by a power law of spectral indexes γ = 0.8 and γ = 1.5 for 3He and 4He, respectively.
Isotope composition of secondary hydrogen and helium above the atmosphere measured by the instruments NINA and NINA-2 / Bidoli V.; Casolino M.; De Pascale M.; Furano G.; Iannucci A.; Morselli A.; Picozza P.; Sparvoli R.; Bakaldin A.; Galper A.; Koldashov S.; Korotkov M.; Leonov A.; Mikhailov V.; Voronov S.; Boezio M.; Bonvicini V.; Vacchi A.; Zampa G.; Zampa N.; Ambriola M.; Cafagna F.; Circella M.; De Marzo C.; Adriani O.; Papini P.; Spillantini P.; Straulino S.; Vannuccini E.; Ricci M.; Castellini G.. - In: JOURNAL OF GEOPHYSICAL RESEARCH. - ISSN 0148-0227. - STAMPA. - 108:(2003), pp. 1-5. [10.1029/2002JA009684]
Isotope composition of secondary hydrogen and helium above the atmosphere measured by the instruments NINA and NINA-2
ADRIANI, OSCAR;PAPINI, PAOLO;SPILLANTINI, PIERO;STRAULINO, SAMUELE;VANNUCCINI, ELENA;CASTELLINI, GUIDO
2003
Abstract
In this paper we report on the energy spectra and abundance ratios of hydrogen and helium isotopes of albedo origin, measured by the instruments NINA and NINA-2 ïn near-equatorial regions. The instrument NINA flew on board the satellite Resurs-01-N4 between 1998 and 1999, at a 830 km average altitude. The NINA-2 apparatus, on board the satellite MITA, was put into orbit in July 2000 at an altitude of about 450 km. NINA and NINA-2 measurements revealed that 2H, 3H, 3He, and 4He are a significant portion of the secondary flux above the atmosphere. The energy spectra of hydrogen isotopes are practically flat across the energy range of 10-40 MeV/n, while the spectra of helium isotopes can be fitted by a power law of spectral indexes γ = 0.8 and γ = 1.5 for 3He and 4He, respectively.
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