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Anisotropy of Galactic Iron of Energy 30 to 500 GeV/amu Studied by HEAO-3

Garrard, T. L. and Gibner, P. S. and Israel, M. H. and Klarmann, J. and Waddington, C. J. and Binns, W. R. (1987) Anisotropy of Galactic Iron of Energy 30 to 500 GeV/amu Studied by HEAO-3. In: Proceedings of the 21st International Cosmic Ray Conference. Vol.1. , Nakau, Russia, p. 348.

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The anisotropy of cosmic ray iron observed by the Heavy Nuclei Experiment [1] on the HEA0-3 spacecraft has been studied. A high rigidity data set was chosen by requiring the Stoermer cutoff be greater than 7 GV, and the energy of individual events was determined by relativistic rise in the ion chamber signal [2]. Events which have estimated rigidity well above their Stoermer cutoff rigidity were chosen in order to reduce the effect of the geomagnetic field on the cosmic ray trajectories. Selecting events with estimated rigidity greater than ~58 GV from eight months of data yields 2459 events. This data set allows an anisotropy measurement with a statistical uncertainty of 3%. We will continue to try increasing the size. of the selected data set while limiting systematic errors due to the geomagnetic and interplanetary fields.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Israel, M. H.0000-0002-8104-208X
Binns, W. R.0000-0001-6110-3407
Additional Information:© INR. Provided by the NASA Astrophysics Data System. This research was supported in part by NASA under grants NAG 8-498, 500, and 502 and NGR 05-002-160, 24-005,050, and 26-008-001.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
NASANGR 05-002-160
NASANGR 26-008-001
NASANGR 24-005-050
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1987-04
Record Number:CaltechAUTHORS:20140512-132135742
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45691
Deposited By: Joy Painter
Deposited On:12 May 2014 20:31
Last Modified:09 Mar 2020 13:18

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