CaltechAUTHORS
  A Caltech Library Service

Maps of Hydrogen Isotopes at Low Altitudes in the Inner Zone from SAMPEX Observations

Looper, M. D. and Blake, J. B. and Mewaldt, R. A. (1998) Maps of Hydrogen Isotopes at Low Altitudes in the Inner Zone from SAMPEX Observations. Advances in Space Research, 21 (12). pp. 1679-1682. ISSN 0273-1177. https://resolver.caltech.edu/CaltechAUTHORS:20150108-142346717

Full text is not posted in this repository. Consult Related URLs below.

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20150108-142346717

Abstract

The PET instrument aboard the SAMPEX satellite has provided us with long-term intra-calibrated observations of geomagnetically trapped protons and deuterons in the inner zone, suitable for use in constraining the low-altitude portions of radiation belt models being developed as successors to AP-8. These observations have been summarized elsewhere (Looper et al., 1996). Here we report a detection of geomagnetically-trapped tritium at energies from 14 to 35 MeV/nuc below L = 1.2, at about 1/8 the flux of deuterium previously reported at that location and at similar energy per nucleon. We also demonstrate the utility of the SAMPEX/PET observations for measuring the east-west anisotropy in the trapped particle flux at low altitudes, which is due to displacement of particle gyrocenters from the position of observation in a region of strong flux gradients. This anisotropy is implicitly ignored in omnidirectional radiation-flux models, but it can be important to mission planners considering how to distribute shielding over the surface of oriented spacecraft in low Earth orbit.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/S0273-1177(98)00014-3DOIArticle
http://www.sciencedirect.com/science/article/pii/S0273117798000143PublisherArticle
ORCID:
AuthorORCID
Mewaldt, R. A.0000-0003-2178-9111
Additional Information:© 1998 COSPAR. Published by Elsevier Science Ltd. This work was supported by NASA at The Aerospace Corporation under NASA Cooperative Agreement 26979B and at Caltech under contract NAS5-30704 and grant NAGW-1919.
Group:Space Radiation Laboratory
Funders:
Funding AgencyGrant Number
NASANAGW-1919
NASANAS5-30704
NASA26979B
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1998-15
Issue or Number:12
Record Number:CaltechAUTHORS:20150108-142346717
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150108-142346717
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:53383
Collection:CaltechAUTHORS
Deposited By: Deborah Miles
Deposited On:09 Jan 2015 22:43
Last Modified:22 Nov 2019 09:58

Repository Staff Only: item control page