Helium in near Earth orbit

Authors
Alcaraz, J Alpat, B Ambrosi, G Anderhub, H Ao, L Arefiev, A Azzarello, P Babucci, E Baldini, L Basile, M Barancourt, D Barao, F Barbier, G Barreira, G Battiston, R Becker, R Becker, U Bellagamba, L Bene, P Berdugo, J Berges, P Bertucci, B Biland, A Bizzaglia, S Blasko, S Boella, G Boschini, M Bourquin, M Brocco, L Bruni, G Buenerd, M Burger, JD Burger, WJ Cai, XD Camps, C Cannarsa, P Capell, M Casadei, D Casaus, J Castellini, G Cecchi, C Chang, YH Chen, HF Chen, HS Chen, ZG Chernoplekov, NA Chiueh, TH Chuang, YL Cindolo, F Commichau, V Contin, A Cristinziani, M da Cunha, JP Dai, TS Deus, JD Dinu, N Djambazov, L D'Antone, I Dong, ZR Emonet, P Engelberg, J Eppling, FJ Eronen, T Esposito, G Extermann, P Favier, J Fiandrini, E Fisher, PH Fluegge, G Fouque, N Galaktionov, Y Gervasi, M Giusti, P Grandi, D Grimm, O Gu, WQ Hangarter, K Hasan, A Hermel, V Hofer, H Huang, MA Hungerford, W Ionica, M Ionica, R Jongmanns, M Karlamaa, K Karpinski, W Kenney, G Kenny, J Kim, W Klimentov, A Kossakowski, R Koutsenko, V Kraeber, M Laborie, C Laitinen, T Lamanna, G Laurenti, G Lebedev, A Lee, SC Levi, G Levtchenko, P Liu, CL Liu, HT Lopes, I Lu, G Lu, YS Lubelsmeyer, K Luckey, D Lustermann, W Mana, C Margotti, A Mayet, F McNeil, RR Meillon, B Menichelli, M Mihul, A Mourao, A Mujunen, A Palmonari, F Papi, A Park, IH Pauluzzi, M Pauss, F Perrin, E Pesci, A Pevsner, A Pimenta, M Plyaskin, V Pojidaev, V Pohl, M Postolache, V Produit, N Rancoita, PG Rapin, D Raupach, F Ren, D Ren, Z Ribordy, M Richeux, JP Riihonen, E Ritakari, J Roeser, U Roissin, C Sagdeev, R Sartorelli, G von Dratzig, AS Schwering, G Scolieri, G Seo, ES Shoutko, V Shoumilov, E Siedling, R Son, D Song, T Steuer, M Sun, GS Suter, H Tang, XW Ting, SCC Ting, SM Tornikoski, M Torsti, J Trumper, J Ulbricht, J Urpo, S Usoskin, I Valtonen, E Vandenhirtz, J Velcea, F Velikhov, E Verlaat, B Vetlitsky, I Vezzu, F Vialle, JP Viertel, G Vite, D Von Gunten, H Wicki, SW Wallraff, W Wang, BC Wang, JZ Wang, YH Wiik, K Williams, C Wu, SX Xia, PC Yan, JL Yan, LG Yang, CG Yang, M Ye, SW Yeh, P Xu, ZZ Zhang, HY Zhang, ZP Zhao, DX Zhu, GY Zhu, WZ Zhuang, HL Zichichi, A Zimmermann, B Zuccon, P
Citation
J. Alcaraz et al., Helium in near Earth orbit, PHYS LETT B, 494(3-4), 2000, pp. 193-202
Citations number
41
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICS LETTERS B
ISSN journal
0370-2693 → ACNP
Volume
494
Issue
3-4
Year of publication
2000
Pages
193 - 202
Database
ISI
SICI code
0370-2693(20001130)494:3-4<193:HINEO>2.0.ZU;2-R
Abstract
The helium spectrum from 0.1 to 100 GeV/nucleon was measured by the Alpha M agnetic 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 rved. In the second helium spectra over the energy range 0.1 to 1.2 GeV/nuc leon the flux was measured to be (6.3 +/- 0.9) x 10(-3) (m(2) sec sr)(-1) a nd more than ninety percent of the helium was determined to be He-3 (at the 90% CL). Tracing helium from the second spectrum shows that about half of the 3He travel for an extended period of time in the geomagnetic field and that they originate from restricted geographic regions similar to protons a nd positrons. (C) 2000 Published by Elsevier Science B.V.