ITA
ENG

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

Categorie Soggetti

Physics

Journal title

PHYSICS LETTERS B

ISSN journal

03702693 → 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.