Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999adspr..23.1829k&link_type=abstract
Advances in Space Research, Volume 23, Issue 11, p. 1829-1832.
Astronomy and Astrophysics
Astronomy
2
Scientific paper
We present the results of an analysis by ASCA (Japanese X-ray astronomy satellite) observation of the lunar surface on July 10th - 11th, 1993. In spite of the fact that the X-ray surface brightness is estimated to be at nearly CXB (Cosmic X-ray Background) level, the X-ray spectrum shows significant deviations in relation to Al-Kα and Si-Kα fluorescence X-rays. According to the intensity ratios of Al/Si (1-2) and Mg/Si (<0.4), the properties of the X-ray spectrum is consistent with an intermediate abundance ratio between highlands and mares (or relatively similar to highland values). However, the X-ray illuminated region on the lunar surface are mainly covered with mare regions and the emission of Al-K and Si-K fluorescence arises from both day side and night side region of the moon. These facts indicate the existence of X-ray production due to bremsstrahlung, with high energy particles impacting even on the night side.
Kamata Yukiko
Okada Taka
Takeshima Toshi
Terada Kentaro
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