6533b7ddfe1ef96bd1275424
RESEARCH PRODUCT
Sphinx measurements of the 2009 solar minimum x-ray emission
Sergey KuzinKjh PhillipsJaroslaw BakalaBarbara SylwesterMiroslaw KowalinskiJanusz SylwesterM. GryciukFabio RealePiotr PodgorskiSzymon GburekFrantišek FárníkMarek Siarkowskisubject
Solar minimumAstrophysics::High Energy Astrophysical PhenomenaFluxFOS: Physical sciencesAstrophysicsAstrophysics::Cosmology and Extragalactic Astrophysics01 natural scienceslaw.inventionLuminosityTelescopeSettore FIS/05 - Astronomia E Astrofisicalaw0103 physical sciencesROSATAstrophysics::Solar and Stellar Astrophysics010303 astronomy & astrophysicsSolar and Stellar Astrophysics (astro-ph.SR)Astrophysics::Galaxy AstrophysicsPhysicsRange (particle radiation)Spacecraft010308 nuclear & particles physicsbusiness.industryX-rayAstronomy and Astrophysicsactivity Sun: corona Sun: X-rays gamma rays [Sun]Astrophysics - Solar and Stellar AstrophysicsSpace and Planetary ScienceSun: activity Sun: corona Sun: X-rays gamma raysbusinessdescription
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 10^47 cm^-3 and 1.1 x 10^48 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-03-30 |