Helium in near earth orbit

AMS Collaboration

Research output: Contribution to journalArticlepeer-review

181 Scopus citations

Abstract

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±0.9)±10-3 (m2 sec sr)-1 and more than ninety percent of the helium was determined to be 3He (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 and positrons.

Original languageEnglish
Pages (from-to)193-202
Number of pages10
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume494
Issue number3-4
DOIs
StatePublished - 30 Nov 2000

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