Electrodynamics – Past, Present, and...
Transcript of Electrodynamics – Past, Present, and...
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Electrodynamics–Past,Present,andFuture
TimFuller-Rowell
CIRES,Univ.ofColoradoandSpaceWeatherPredicConCenter,NOAA
June20th,2017 CEDARElectrodynamicsWorkshop
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Whatdoyouneedforelectrodynamics?WhatdidweknowinthesixCes?
• Ionosphere–reasonablemodels,goodobservaCons• MagneCcfield–offsetdipole• Neutralatmosphere–composiConanddensity• AtmosphericmoCon-evolving• Collisionsbetweentheneutralsandplasma-reasonablywellunderstood
• Coulombforces• Lorentzforce• Collisionalforces–RishbethandGarrioX,1969(ionandelectronmobiliCes)June20th,2017 CEDARElectrodynamicsWorkshop
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NeutralThermosphereDynamics
• KohlandKing1967• SolarUVandEUV• Daysidepressurebulge• Pressure,Coriolis,andiondrag• Upperthermospherewindsnolongeringeostrophicbalance
• In-situgenerated(1,-2)Cde–notpropagaCng• Dayside,lowerthermospherewindsdrivingelectrodynamicwasmissing
June20th,2017 CEDARElectrodynamicsWorkshop
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June20th,2017 CEDARElectrodynamicsWorkshop
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ClassicalTidalTheorylinearized,separaConofvariable,eigenfuncCons,Houghmodes
propagaCngdiurnal(1,1)andsemi-diurnalCdes(2,2)
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June20th,2017 CEDARElectrodynamicsWorkshop
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OneofaboutadozenRichmondreviewsoverthefollowing~40years
June20th,2017 CEDARElectrodynamicsWorkshop
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ProducCveCmes:J.ForbesandR.S.Lindzen(1976).AtmosphericsolarCdesandtheirelectrodynamiceffects.PartI:TheglobalSqcurrentsystem.J.Atmos.Ter.Phys.
J.ForbesandR.S.Lindzen(1976).AtmosphericsolarBdesandtheirelectrodynamiceffects.PartII:Theequatorialelectrojet.J.Atmos.Ter.Phys.
J.ForbesandR.S.Lindzen(1977).AtmosphericsolarBdesandtheirelectrodynamiceffects.PartIII:Th.epolarizaBonelectricfield.J.Atmos.Ter.Phys.
Heelis,R.(1974).ElectricalcouplingoftheE-andF-regionsanditseffectonF-regiondriQsandwinds.Planet.SpaceSci.
Rishbeth,H.(1971).TheF-layerdynamo.Planet.SpaceSci.
Anderson,D.andR.Roble(1973).TheeffectofverBcalExBionosphericdriQonF-regionneutralwindsinthelow-laBtudethermosphere.J.Geophys.Res.
Matsushita,S.(1969).Dynamocurrents,winds,andelectricfields.RadioSci.
June20th,2017 CEDARElectrodynamicsWorkshop
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June20th,2017
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1970sThermosphericModels
Volland,MayrandHarrisetal.-spectralmodelwithnon-linearperturbaBon
CreekmoreandStraus,J.M.etal.–notalwaysself-consistent
Dickinsonetal.,zonally-averagedcirculaBon
Emeryetal.,
RichmondandMatsushita,1975
………
June20th,2017 CEDARElectrodynamicsWorkshop
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StormcirculaCon:
GravitywavesdrivenbyhighlaCtudemagnetosphericenergysourcesLeadtoaseriesofRichmondpapersongravitywaves
June20th,2017 CEDARElectrodynamicsWorkshop
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Equatorwardwindsurges
June20th,2017 CEDARElectrodynamicsWorkshop
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Consequences:disturbancedynamotheory
June20th,2017 CEDARElectrodynamicsWorkshop
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Storm-TimeElectrodynamics:disturbancedynamoBlanc and Richmond (1980) theory:
• Equatorward winds drive zonal winds at mid-latitude through the action of the Coriolis force • Zonal winds → equatorward Pedersen current • Equatorward wind → equatorward Hall current • Positive charge builds up at the equator producing a poleward directed electric field which balance the wind driven equatorward current • Poleward electric field drives an eastward Hall current causes +ve charge build up at the dusk terminator and -ve charge build-up at dawn • Reverse Sq
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Jϑu = −σ1sin I
uφB +σ 2uθB
Jφu =σ1 sin IuθB +σ 2uφB
JθE =σ1sin I
Eε +σ 2
sin IEφ
JφE = −σ 2Eε +σ1Eφ
June20th,2017 CEDARElectrodynamicsWorkshop
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1980sandearly90s
• Globalthree-dimensional,non-linear,thermospheremodelsdeveloped–windsandtemperature(NCARandUCL)
• Coupledwiththree-speciescomposiCon• Coupledtoanionosphere• Tidalforcingatthelowerboundary–Fesen,Parish,Ingo-Mueller-Wodarg
• Electrodynamiccoupling-Richmondetal.1987;1992
June20th,2017 CEDARElectrodynamicsWorkshop
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SourceofElectrodynamicDrifontheDayside
noCdes
600m
300m
verCcaliondrifatmagneCcequatordrivenbydifferentmagnitudesof(2,2)semi-diurnal
Houghmode
JicamarcadataScherliessandFejer
CTIPemodel
NmF2
UCL–SheffieldModelCTIPMillward,1993,Millwardetal.1996CoupledelectrodynamicsMillwardetal.,2001
usingRichmondsolver
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Disturbance Dynamo vs Magnetospheric Penetration Nightside Electric Fields
Systemtheoryapproach:solarwind/magnetospheredriverKelleyetal.
Physicalmodelapproach:disturbancedynamoMaruyamaetal:
June20th,2017 CEDARElectrodynamicsWorkshop
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EastwardElectricField
SouthwardNeutralWind
CEDARElectrodynamicsWorkshop
Rapidresponse
€
Jϑu = −σ1sin I
uφB +σ 2uθB
Jφu =σ1 sin IuθB +σ 2uφB
JθE =σ1sin I
Eε +σ 2
sin IEφ
JφE = −σ 2Eε +σ1Eφ
June20th,2017
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June20th,2017 CEDARElectrodynamicsWorkshop
Scherliess and Fejer, JGR, 1999
Contribution of observations to empirical models (Fejer and Scherliess)
• Vertical ion drifts have strong diurnal variation - up during the day and down at night.
• Variability is high.
• Pre-reversal enhancement is a strong function of season and solar activity.
• E-region dynamo explains the diurnal variation, F-region the pre-reversal enhancement
Quiet
Storm
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Other examples: 50% increase in TEC in January 2009 when solar and geomagnetic activity were very low
Goncharenko et al. 2010
IsthisalsoaresponsetochangingCdalamplitudes?
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• CTIPesimulaConswithWAMwinds(lowerpanel)appeartoreproducethemainfeaturesintheobservedverCcalplasmadrif(upperpanel)duringaSSW,includingthestrongerupwarddrifearlyinthemorningandreversaltodownwardintheafernoon
• LargestCdalchangesduringintervalareinSW2andTW3
June 20th, 2017
Chauetal.
Fuller-Rowelletal.2011 CEDARElectrodynamicsWorkshop
average95-155km,20–60°north
SW2
TW3
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What’s the physics? Three possibilities… • AmplificaConoflunarCde (JeffForbes)
Eccles
• Changeinozoneforcing(LarisaGoncharenko)
• ChangeinCdalpropagaConthroughthealteredbackground
winds
CEDAR Electrodynamics Workshop June20th,2017
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ExampleofimpactofCdalvariabilityTzu-WeiFang,ArtRichmond,GeorgeMillward,etal.fromWAM-GIPmodelsimulaConwithRichmond’selectrodynamicssolverwithIGRFinAPEXcoords
June20th,2017 CEDARElectrodynamicsWorkshop
ModulaConofsemi-diurnalCdeSW2correlateswithincreasesinpeakverCcal
plasmadrifandNmF2
ModulaConofDE3andDE2Cdalamplitudescorrelateswithnumberofpeaksinlongitude
structureofverCcalplasmadrif
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Future
• InteracConbetweenmagnetosphericanddynamoelectrodynamics
• Understandingtheforcingfromtheloweratmosphere–Cdes,gravitywaves,etc.
• HighresoluConwholeatmospheremodelswithcoupledionosphereandelectrodynamics
• ElectrifiedMS-TIDs–e.g.,Kelly,PerkinsinstabiliCes• RelaConshipbetweenmesoscaledynamicsand
electrodynamicsandsmall-scaleionosphericirregulariCes• B,VvsE,Jparadigm• Co-rotaCon
June20th,2017 CEDARElectrodynamicsWorkshop