[太阳活动区磁场倾斜与缠绕的研究]田莉荣

【太阳活动区磁场倾斜与缠绕的研究】田莉荣.pdf

Study on Tilt and Twist of Solar Active Region Magnetic Fields by Tian Lirong DepartmentofAstronomy,Beijing Normal University; BeijingAstronomical Observatory,National Astronomical Observatories,Chinese Academy of Sciences Beijing,China Supervisors TongYiZhangHongqi Dissertation for the Degree oAbstract Magnetichelicityprovidesasimpleparameterforquantifyingtopological structureofmagneticfelds,whichisrelevanttotwistofmagneticlines,be ingleft-handed(negative)orrighthanded(positive)During last seven years interest in it has grown dramatically in solar physics,due to improved ca-pabilitiesItisinstructivetoestimatequantitativelythemagnitudesofthetwistthat eachsuch mechanism mightproduce,and makingsuch quantitative compari- sonwiththeobservation.But,thefinalamountofthetwistwouldprobably force,small-scale convection turbulentmotions anddifferentrotation,which isnoteasytodisentangle.