Overlooked astrophysical signatures of axion(-like) particles
Overlooked astrophysical signatures of axion(-like) particles
Overlooked astrophysical signatures of axion(-like) particles
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SUNSPOTS Yohkoh - XRTelescopeSolar Corona Problem quiet Sun UmbraPenumbraTemperature distributionsA.Nindos, M.R.Kundu, S.M.White, K.Shibasaki, N.Gopalswamy,ApJ. SUPPL. 130 (2000) 485----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- “… sunspots remain mysterious”.Sunspots = “dark spots” T ⇩ photosphere~ 4500K heat flux problemin umbra + penumbraSpruit, Scharmer, A.&A. (2005), astro-ph/0508504 CoronaS<strong>of</strong>t X-ray fluxes TAUP2005T ⇧Sunspots: ~ 50 - 190 DN/sQuiet Sun: ~ 10 - 50 DN/s(ARs: ~ 500 - 4000 DN/s) sunspot plasma parametersare higher than @ quiet-Sun B ~ 2 kG above most sunspots ! The penumbral mystery … the very reason for its existence unknown.http://www.solarphysics.kva.se/NatureNov2002/background.html
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