The SphinX X-ray spectrophotometer on the CORONAS-PHOTON spacecraft measured soft X-ray emission in the 1-15 keV energy range during the deep solar minimum of 2009 with a sensitivity much greater than GOES. Several intervals are identified when the X-ray flux was exceptionally low, and the flux and solar X-ray luminosity are estimated. Spectral fits to the emission at these times give temperatures of 1.7-1.9 MK and emission measures between 4 × 1047 cm-3 and 1.1 × 1048 cm-3. Comparing SphinX emission with that from the Hinode X-ray Telescope, we deduce that most of the emission is from general coronal structures rather than confined features like bright points. For one of 27 intervals of exceptionally low activity identified in the SphinX data, the Sun's X-ray luminosity in an energy range roughly extrapolated to that of ROSAT (0.1-2.4 keV) was less than most nearby K and M dwarfs.

Sylwester, J., Kowalinski, M., Gburek, S., Siarkowski, M., Kuzin, S., Farnik, F., et al. (2012). SphinX Measurements of the 2009 Solar Minimum X-Ray Emission. THE ASTROPHYSICAL JOURNAL, 751(2), 111 [10.1088/0004-637X/751/2/111].

SphinX Measurements of the 2009 Solar Minimum X-Ray Emission

REALE, Fabio;
2012

Abstract

The SphinX X-ray spectrophotometer on the CORONAS-PHOTON spacecraft measured soft X-ray emission in the 1-15 keV energy range during the deep solar minimum of 2009 with a sensitivity much greater than GOES. Several intervals are identified when the X-ray flux was exceptionally low, and the flux and solar X-ray luminosity are estimated. Spectral fits to the emission at these times give temperatures of 1.7-1.9 MK and emission measures between 4 × 1047 cm-3 and 1.1 × 1048 cm-3. Comparing SphinX emission with that from the Hinode X-ray Telescope, we deduce that most of the emission is from general coronal structures rather than confined features like bright points. For one of 27 intervals of exceptionally low activity identified in the SphinX data, the Sun's X-ray luminosity in an energy range roughly extrapolated to that of ROSAT (0.1-2.4 keV) was less than most nearby K and M dwarfs.
Settore FIS/05 - Astronomia E Astrofisica
http://iopscience.iop.org/0004-637X/751/2/111/
Sylwester, J., Kowalinski, M., Gburek, S., Siarkowski, M., Kuzin, S., Farnik, F., et al. (2012). SphinX Measurements of the 2009 Solar Minimum X-Ray Emission. THE ASTROPHYSICAL JOURNAL, 751(2), 111 [10.1088/0004-637X/751/2/111].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10447/73025
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