Publications of the Astronomical Society of Japan | |
Temperature Distributions and Energy Scaling Law of Solar Coronal Loops Obtained with Yohkoh | |
Kano, Ryouhei1  Tsuneta, Saku1  | |
[1] Institute of Astronomy, The University of Tokyo, Mitaka, Tokyo 181 E-mail{RK): | |
关键词: Magnetohydrodynamics; "Sun: activity"; "Sun: corona"; "Sun: X-rays"; | |
DOI : 10.1093/pasj/48.3.535 | |
学科分类:天文学(综合) | |
来源: Oxford University Press | |
【 摘 要 】
Wederivedthetemperaturedistributionsalongthe16steadyloopsobservedwiththeYohkohSoftX-rayTelescope.Wehavefoundthatthetemperatureandemissionmeasure(pressure)arethehighestaroundthelooptop,anddecreasetowardsthefootpoints.Someoftheloopshaveaplateauinthetemperaturedistributionataroundthelooptop(“trapezoidalâ€temperaturedistribution).Theotherloops,ontheotherhand,haveasharppeakinthetemperaturedistributions(“triangularâ€temperaturedistribution).Thistriangulartemperaturedistributionsuggeststhattheenergyinputisconcentratedatthepeak.Wehaveestimatedthethermalconductivefluxesdownwardtothefootpointsfromthegradientsofthetemperaturedistributions.Thefluxrangesfrom1×107to2×108[ergs−1cm−2].WederivedthetotalenergylossLT,whichisthesumoftheconductiveandradiativelosses:LT=2×107−3×108[ergs−1cm−2].WediscoveredagoodcorrelationbetweenthetotalenergylossandthegaspressurePgforthesteadyloops:LT=1.2×107p0.99±0.12g.Thecorrelationisconsistentwiththetheoreticalenergyscalinglawforthesteadyloops:LT=4.0–5.1×103·(pg·Tm1/2),whereTmisthemaximumtemperature(Tm∼6×106[K]foralltheloopsanalyzedhere).
【 授权许可】
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