Radiation dose analysis of galactic cosmic ray in low earth orbit/near equatorial orbit

Wayan Suparta, S. K. Zulkeple

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Space environment contained harmful radiation that posed risk to spacecraft orbiting the Earth. In this paper, we looked into radiation doses caused by galactic cosmic ray (GCR) towards satellites orbiting in low earth orbit (LEO) near Earth's equator (NEqO) and compared them with doses caused by solar energetic particles (SEP) and trapped particles to determine the damage level of GCR. The radiation doses included linear energy transfer (LET) and nonionizing energy loss (NIEL) through a 1mm gallium arsenide (GaAs) planar geometry by using Space Environment Information System (SPENVIS) method. The orbital data followed Malaysian Razaksat satellite at 685km altitude and 9° inclination during selected solar minimum and solar maximum from solar cycles 21 to 24. We found that trapped particles gave the highest LET and no SEP was detected in SPENVIS. The LET values tend to be higher during solar minimum for trapped particles and GCR, corresponding to their anti-correlated fluxes with the solar activity. However, the NIEL values for GCR in solar cycle 23 did not follow the anti-correlation pattern.

Original languageEnglish
Article number012010
JournalJournal of Physics: Conference Series
Volume539
Issue number1
DOIs
Publication statusPublished - 2014

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equatorial orbits
low Earth orbits
linear energy transfer (LET)
trapped particles
aerospace environments
dosage
information systems
radiation
energetic particles
solar cycles
energy dissipation
equators
solar activity
inclination
gallium
spacecraft
damage
orbitals
geometry

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Radiation dose analysis of galactic cosmic ray in low earth orbit/near equatorial orbit. / Suparta, Wayan; Zulkeple, S. K.

In: Journal of Physics: Conference Series, Vol. 539, No. 1, 012010, 2014.

Research output: Contribution to journalArticle

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