Magnetic Field and Heating of the Corona
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Transcript of Magnetic Field and Heating of the Corona
Magnetic Field and Heating of Magnetic Field and Heating of the Coronathe Corona
Valentyna Abramenko and Vasyl Valentyna Abramenko and Vasyl YurchyshynYurchyshyn
Big Bear Solar ObservatoryBig Bear Solar Observatory
Soft X-ray luminosity of the Soft X-ray luminosity of the corona corona
Active Regions: Active Regions: Total unsigned Total unsigned magnetic flux versus Soft X-ray fluxmagnetic flux versus Soft X-ray flux
Abramenko, Pevtsov, Romano 2006Abramenko, Pevtsov, Romano 2006
Structural parameters of the magnetic field versus Structural parameters of the magnetic field versus the area-averaged X-ray flux in the Al1.1 channelthe area-averaged X-ray flux in the Al1.1 channel
Abramenko , 2007Abramenko , 2007
Time variations of the power index and flatness Time variations of the power index and flatness index from SOT/FG/Hinode magnetograms for NOAA index from SOT/FG/Hinode magnetograms for NOAA
1093010930Abramenko & Yurchyshyn, 2007Abramenko & Yurchyshyn, 2007
Poynting Flux vs X-ray Flux:Poynting Flux vs X-ray Flux:area-averaged valuesarea-averaged values
Follow-up study: Tan, Jing, Abramenko, Pevtsov, Song, Park, Wang, 2007 ApJ
Poynting Flux ~ Bh Bz Vh
Bz Bz Vh
Total unsigned magnetic flux versus X-ray Total unsigned magnetic flux versus X-ray luminosity for different objectsluminosity for different objects
Pevtsov et al. 2003Pevtsov et al. 2003
Coronal Holes: Magnetic flux versus the Coronal Holes: Magnetic flux versus the corresponding solar wind speedcorresponding solar wind speed
Abramenko & Yurchyshyn 2007Abramenko & Yurchyshyn 2007
•ConclusionsConclusions
Energy input due to the random motions Energy input due to the random motions strongly correlates with brightness, strongly correlates with brightness, temperature and emission measure of the temperature and emission measure of the corona.corona.
Energy flux is (1 ÷ 14)×10Energy flux is (1 ÷ 14)×1066 erg cm erg cm-2-2 s s-1-1, which , which is quite sufficient to heat the corona above is quite sufficient to heat the corona above ARs.ARs.
Magnetic diffusivity in ARs is Magnetic diffusivity in ARs is (150 ÷ 300) km2/s, which is twice lower than in QS areas., which is twice lower than in QS areas.
Magnetic dissipation versus Magnetic dissipation versus temperature and emission temperature and emission
measuremeasure
Magnetic dissipation versus averaged Magnetic dissipation versus averaged flux in Al.1 and AlMgMn channelsflux in Al.1 and AlMgMn channels
Flux d
ensi
ty (
Al.1
)
Flux d
ensi
ty (
AlM
gM
n)