The Relationship Between X-Ray Radiance and Magnetic Flux

Details The Relationship Between X-Ray Radiance and Magnetic Flux The Relationship Between X-Ray Radiance and Magnetic Flux

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...598.1387p&link_type=abstract

The Astrophysical Journal, Volume 598, Issue 2, pp. 1387-1391.

Astronomy and Astrophysics

Astronomy

78

Stars: Coronae, Stars: Magnetic Fields, Sun: Corona, Sun: Magnetic Fields, Sun: X-Rays, Gamma Rays

Scientific paper

We use soft X-ray and magnetic field observations of the Sun (quiet Sun, X-ray bright points, active regions, and integrated solar disk) and active stars (dwarf and pre-main-sequence) to study the relationship between total unsigned magnetic flux, Φ, and X-ray spectral radiance, LX. We find that Φ and LX exhibit a very nearly linear relationship over 12 orders of magnitude, albeit with significant levels of scatter. This suggests a universal relationship between magnetic flux and the power dissipated through coronal heating. If the relationship can be assumed linear, it is consistent with an average volumetric heating rate Q~B/L, where B is the average field strength along a closed field line and L is its length between footpoints. The Φ-LX relationship also indicates that X-rays provide a useful proxy for the magnetic flux on stars when magnetic measurements are unavailable.

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