SIMBAD references

2003ApJ...598.1387P - Astrophys. J., 598, 1387-1391 (2003/December-1)

The relationship between X-ray radiance and magnetic flux.

PEVTSOV A.A., FISHER G.H., ACTON L.W., LONGCOPE D.W., JOHNS-KRULL C.M., KANKELBORG C.C. and METCALF T.R.

Abstract (from CDS):

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 LXexhibit 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{d1}∼B{d1}/L, where B{d1} is the average field strength along a closed field line and L is its length between footpoints. The Φ-LXrelationship also indicates that X-rays provide a useful proxy for the magnetic flux on stars when magnetic measurements are unavailable.

Abstract Copyright:

Journal keyword(s): Stars: Coronae - Stars: Magnetic Fields - Sun: Corona - Sun: Magnetic Fields - Sun: X-Rays, Gamma Rays

Simbad objects: 7

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2019.10.16-17:35:28

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