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1、GEOPHYSICALRESEARCHLETTERS,VOL.39,L07102,doi:10.1029/2012GL051347,2012Asuggestionthattwo-dimensionalturbulencecontributestopolarcapconvectionforBznorth12M.C.KelleyandH.-J.KimReceived14February2012;revised6March2012;accepted7March2012;published12April2012.[1]Recently,aline
2、ardependencehasbeenfoundbetweendominatesthepolarcappotential(PCP).Weargueherethat,thepolarcappotentialandthelogofULFpowerintheforBznorth,themechanismdiscussedherecompetesforsolarwindforBznorth.WeargueherethatthisisverycontrolofthePCPequallywithcuspconnectionsand,strongevi
3、dencethatAlfvénwavespropagatingfromtheatlowerlatitudes,withviscousinteraction[Axfordandsolarwindtothepolarcapdrivetwo-dimensionalHines,1961].turbulenceinagreementwithotherworkalongtheselines.[5]TherearetwoauroracharacteristicsintheBz-northpolarInbrief,two-dimensional(2-D)
4、turbulenceischaracterizedcap.Themostwell-knownisthethetaaurora[Franketal.,byaninversecascadeofenergyfromintermediatetolarge1986].Thisauroralformsplitsthepolarcapandiscollo-scales,eventuallyleadingtotwolargecounter-rotatingcatedwithanupwardfield-alignedcurrent.Cumnocketal.
5、vorticesfillingtheavailablevolumeand,wethink,creating[2002]showedthatthisarceruptsoutoftheauroralovalandtwoofthefourvorticesintheBznorthpolarcap.Inthismigratesacrossthepolarcaptoitstheta-barlocation.Thiswasmodel,theAlfvénwavescreatevelocityshearatthe500orverifiedinarocket
6、experimentinwhichconsecutiverocketssokilometerscaleassociatedwithpolarcaparcs.Thiscrossedanarcemergingoutoftheoval.Leavingsunwardenergy/vorticitytheninversecascadestofillthepolarcap.convectionequatorwardofthearc[Bergetal.,1994],thearcCitation:Kelley,M.C.,andH.-J.Kim(2012)
7、,Asuggestionthatitselfpropagatedataspeedhigherthanarealisticconvectiontwo-dimensionalturbulencecontributestopolarcapconvectionspeed.Thisissimilartotherapidpoleward(apparent)motionforBznorth,Geophys.Res.Lett.,39,L07102,doi:10.1029/ofsubstorm-relatedaurora.2012GL051347.[6]T
8、hesecondtypeofpolarcapaurorawasreportedbyLassenandDanielsen[1978]andisshowninFigure2.1.Introduct
