Helium in near Earth orbit

The helium spectrum from 0.1 to 100 GeV/nucleon was measured by the Alpha Magnetic Spectrometer (AMS) during space shuttle flight STS-91 at altitudes near 380 km. Above the geomagnetic cutoff the spectrum is parameterized by a power law. Below the geomagnetic cutoff a second helium spectrum was obse...

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Detalles Bibliográficos
Autores principales: Alcaraz, J, Alpat, B, Ambrosi, G, Anderhub, H, Ao, L, Arefev, A, Azzarello, P, Babucci, E, Baldini, L, Basile, M, Barancourt, D, Barão, F, Barbier, G, Barreira, G, Battiston, R, Becker, R, Becker, U, Bellagamba, L, Béné, P, Berdugo, J, Berges, P, Bertucci, B, Biland, A, Bizzaglia, S, Blasko, S, Bölla, G, Boschini, M, Bourquin, Maurice, Brocco, L, Bruni, G, Buénerd, M, Burger, J D, Burger, W J, Cai, X D, Camps, C, Cannarsa, P, Capell, M, Casadei, D, Casaus, J, Castellini, G, Cecchi, C, Chang, Y H, Chen, H F, Chen, H S, Chen, Z G, Chernoplekov, N A, Tzi Hong Chiueh, Chuang, Y L, Cindolo, F, Commichau, V, Contin, A, Cristinziani, M, Da Cunha, J P, Dai, T S, Deus, J D, Dinu, N, Djambazov, L, D'Antone, I, Dong, Z R, Emonet, P, Engelberg, J, Eppling, F J, Eronen, T, Esposito, G, Extermann, Pierre, Favier, Jean, Fiandrini, E, Fisher, P H, Flügge, G, Fouque, N, Galaktionov, Yu, Gervasi, M, Giusti, P, Grandi, D, Grimm, O, Gu, W Q, Hangarter, K, Hasan, A, Hermel, V, Hofer, H, Huang, M A, Hungerford, W, Ionica, M, Ionica, R, Jongmanns, M, Karlamaa, K, Karpinski, W, Kenney, G, Kenny, J, Kim, W, Klimentov, A, Kossakowski, R, Koutsenko, V F, Kräber, M H, Laborie, G, Laitinen, T, Lamanna, G, Laurenti, G, Lebedev, A, Lee, S C, Levi, G, Levchenko, P M, Liu, C L, Liu Hong Tao, Lopes, I, Lu, G, Lü, Y S, Lübelsmeyer, K, Luckey, D, Lustermann, W, Maña, C, Margotti, A, Mayet, F, McNeil, R R, Meillon, B, Menichelli, M, Mihul, A, Mourão, A M, Mujunen, A, Palmonari, F, Papi, A, Park, I H, Pauluzzi, M, Pauss, Felicitas, Perrin, E, Pesci, A, Pevsner, A, Pimenta, M, Plyaskin, V, Pozhidaev, V, Pohl, M, Postolache, V, Produit, N, Rancoita, P G, Rapin, D, Raupach, F, Ren, D, Ren, Z, Ribordy, M, Richeux, J P, Riihonen, E, Ritakari, J, Röser, U, Roissin, C, Sagdeev, R, Sartorelli, G, Schultz von Dratzig, A, Schwering, G, Scolieri, G, Seo, E S, Shoutko, V, Shoumilov, E, Siedling, R, Son, D, Song, T, Steuer, M, Sun, G S, Suter, H, Tang, X W, Ting, Samuel C C, Ting, S M, Tornikoski, M, Torsti, J, Trümper, J E, Ulbricht, J, Urpo, S, Usoskin, I, Valtonen, E, Van den Hirtz, J, Velcea, F, Velikhov, E P, Verlaat, B, Vetlitskii, I, Vezzu, F, Vialle, J P, Viertel, Gert M, Vitè, Davide F, Von Gunten, H P, Waldmeier-Wicki, S, Wallraff, W, Wang, B C, Wang, J Z, Wang, Y H, Wiik, K, Williams, C, Wu, S X, Xia, P C, Yan, J L, Yan Lu Guang, Yang, C G, Yang, M, Ye Shu Wei, Yeh, P, Xu, Z Z, Zhang, H Y, Zhang, Z P, Zhao, D X, Zhu, G Y, Zhu, W Z, Zhuang, H L, Zichichi, A, Zimmermann, B, Zuccon, P
Lenguaje:eng
Publicado: 2000
Materias:
Astrophysics and Astronomy
Acceso en línea:https://dx.doi.org/10.1016/S0370-2693(00)01193-X
http://cds.cern.ch/record/506690
Descripción
Sumario:The helium spectrum from 0.1 to 100 GeV/nucleon was measured by the Alpha Magnetic Spectrometer (AMS) during space shuttle flight STS-91 at altitudes near 380 km. Above the geomagnetic cutoff the spectrum is parameterized by a power law. Below the geomagnetic cutoff a second helium spectrum was observed. In the second helium spectra over the energy range 0.1 to 1.2 GeV/nucleon the flux was measured to be (6.3+or-0.9)*10/sup -3/ (m/sup 2/ sec sr)/sup -1/ and more than ninety percent of the helium was determined to be /sup 3/He (at the 90% CL). Tracing helium from the second spectrum shows that about half of the /sup 3/He travel for an extended period of time in the geomagnetic field and that they originate from restricted geographic regions similar to protons and positrons. (22 refs).

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