| Autor: |
Jingnan Guo, Cary Zeitlin, Robert F. Wimmer-Schweingruber, Scot Rafkin, Donald M. Hassler, Arik Posner, Bernd Heber, Jan Köhler, Bent Ehresmann, Jan K. Appel, Eckart Böhm, Stephan Böttcher, Sönke Burmeister, David E. Brinza, Henning Lohf, Cesar Martin, H. Kahanpää, Günther Reitz |
| Předmět: |
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| Zdroj: |
Astrophysical Journal; 9/1/2015, Vol. 810 Issue 1, p1-1, 1p |
| Abstrakt: |
The Radiation Assessment Detector (RAD), on board Mars Science Laboratory’s (MSL) rover Curiosity, measures the energy spectra of both energetic charged and neutral particles along with the radiation dose rate at the surface of Mars. With these first-ever measurements on the Martian surface, RAD observed several effects influencing the galactic cosmic-ray (GCR) induced surface radiation dose concurrently: (a) short-term diurnal variations of the Martian atmospheric pressure caused by daily thermal tides, (b) long-term seasonal pressure changes in the Martian atmosphere, and (c) the modulation of the primary GCR flux by the heliospheric magnetic field, which correlates with long-term solar activity and the rotation of the Sun. The RAD surface dose measurements, along with the surface pressure data and the solar modulation factor, are analyzed and fitted to empirical models that quantitatively demonstrate how the long-term influences ((b) and (c)) are related to the measured dose rates. Correspondingly, we can estimate dose rate and dose equivalents under different solar modulations and different atmospheric conditions, thus allowing empirical predictions of the Martian surface radiation environment. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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