SphinX MEASUREMENTS OF THE 2009 SOLAR MINIMUM X-RAY EMISSION

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...

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Bibliographic Details
Published in:The Astrophysical journal 2012-06, Vol.751 (2), p.1-5
Main Authors: Sylwester, J, KOWALINSKI, M, Gburek, S, Siarkowski, M, Kuzin, S, FARNIK, F, Reale, F, Phillips, K J H, Bakala, J, GRYCIUK, M, Podgorski, P, Sylwester, B
Format: Article
Language:English
Subjects:
ASTRONOMY
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Emission
Extrapolation
Flux
GAMMA RADIATION
Intervals
KEV RANGE
LUMINOSITY
PHOTON EMISSION
Red dwarf stars
SENSITIVITY
SOFT X RADIATION
SOLAR ACTIVITY
SOLAR CORONA
Spectral emissivity
SPECTROPHOTOMETERS
SUN
TELESCOPES
X-RAY DETECTION
X-rays
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Summary: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 x 10 super(47) cm super(-3) and 1.1 x 10 super(48) cm super(-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.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/751/2/111