Anti-parallel versus Component Reconnection at the Magnetopause
Tutorial Lecturecedarweb.vsp.ucar.edu/wiki/images/7/70/1992_CEDAR... · 2015. 1. 8. · 20U...
51
1992 CEDAR Workshop Boulder, CO June 21-26, 1992 Tutorial Lecture by Michael Lockwood Rutherford-Appleton Laboratory Time-Varying Convection
Transcript of Tutorial Lecturecedarweb.vsp.ucar.edu/wiki/images/7/70/1992_CEDAR... · 2015. 1. 8. · 20U...
1992 CEDAR WorkshopBoulder, CO
June 21-26, 1992
Tutorial Lecture
by Michael LockwoodRutherford-Appleton Laboratory
Time-Varying Convection
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Plasmasphere
Plasma sheet
Magnetopause
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11=00
MARCH 22.1979
I2=0C
FRITZ ET AL. 205
tMAGN£TIC FIELD IS6E-1MARCH 22. 1-979
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FaraAa 'S Laco appVieA. fe polar cap:
§ E.Al =a(E).ftp,Vat=
Expanding Polar Cap Contracting Polar Cap
d ' n(b)ti>d =0 ci>, =8A
(d)J)^j=2Ai^>n=4A
flow equipotential (A kVoport)ionosptieric projection ofreconnectionneutral line (merging gop)adioroic polar cap boundaryboundary motion _ v . i , ^
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(a) 24(b)
06- Flux F - 18
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(c) (d)
F + dF
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i>i-^0n' 'O
>0
9^0 >0
0V =0
(b)
(c)
adiaroic open / closed boundary
merging gap
» flow streamline
boundary motion
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WVOANT CT AL.: POLAR CAI' rOTCmiAL ANU RCCONNECTION MODELS
B^>0
„._3456703
•* HOURS Bg > 0Fig. 6. The cross polar cap polenlini Uu.ing |)erioils wlicn tf/' ''was northward versus the number of hours previousto the measurement of the polarcap potential that v/as northward.
]or \:^0ra(\^ AonA ^ ^rv/X.
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5731
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Knipp ct al.: Ionospheric Convection Response
If^oipp dr al.(Gcopn^».Pi«>. \*W\}
Vk
. JULY2S, W83INTE JPLAKETARY MAGNETIC FIELD
iT'
vJ>j!
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y SO- >•< V
^ ^^-40 "ZO ^a
00
f>OTOfnAL DiFFEKENCe • 1194 kV FOTOmAL OtFFEKEKK* • 94.1 hV
tS Ally 69 By-S.ZnT U July63 12 6Y*2SnTlO'40aT^^ T 2l.6ftT K>50 UT^" —T*Vt.Xv 62*fl6«T
SO* ^SO-
106 Ml
17.4 nT
00 02 04 06 06 10 12 »4 « M 20 22 00
1. IMP-8 IMFdata (GSMcoordinates) for 23 July 1983. K>TCMTVU. OtTFCftCNCC • 63 8 kV WTNTUU. DtPFKNCNCC • crV kV
WorWioaA
\0-.15 UT c\ --e,
lO-.ZSOTaV r<\c^t\^oj>q06€.
I- !.• •, A,U r \]'\<]\)
23 Jvly 631109 OT
s-id^
By-10.6aT 23Ally 63Bj*l92nT IfSC UT
POTtlfnAL 0#FtH£NCE • 75.6 kV FOTENTUL0<FTERE>ICE • 474 kV
Fig. 3. Fitted electric potential patterns for selected timesbetween 1000 UT and 1130 UT on 23 July 1983. Thecontour inteival is 10 kV, The IMF values are shown at theupper right. Inregions where the uncenainty in the large-scaleelectric field is 50% or gre;aer the contours are dashed.
•tokv
2)5 KV
0^ Qfti\Omia
aaX jUoAeco^ *ii\ wcroi\ kootb
2-^
cr
-1
a->
a--
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AR
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:c'ELECTRIC POTENTIAL
12
F
ELECTRIC POTENTIAL
12
me\Vo\C0F\(0-6
XX l*)orcU971
CONTOUR
INTERVAL
15 KV
CONTOUR
interval
15 KV
0d'
0-
0
0,
^max~' o''"^^^max^®pc (^pc~0/)
/
/
/
//
I (growthphase)
^ < »
_L
A2
c (onset) ^«K= roo««
d (convection bay)
(expansion/recovery phase)
Fo-
Circulor Polar Cap
0 pc
A
\
A'> A
r
0,
/
0
i
//
/#
/
/ ''j (growth' phase)
9
/
c (onset)>
'' d (expansion phose)
,, e (recovery phase)
Circular Polar Cap
w /i+4'0 pc
uV ACoto^ dm)
-Q
00
o
X
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.0
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o
/
0
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' max/I
//
//
/ •/ • •
/
/ • .*/.
• •
/
••
Adapted from Hairstonand Heelis(1990)
mm
1
20 40 60 80 100 120 140 160
Transpolar Voltage, </) (KV)pc
Sumcuir3
c
^rvverv
• V^O(<\PQn5on ^ ionospWric
Ex' diftS of>A 00 conviecHofx
VansjiAir vc^lc^C/ w)iH\ie<]tton is ore^oKirMi«UvottQQe QcroQb i-UDL sWocos convedion, *5 predoKiOanj^
reco<w^ec)r>ofi
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• t^Vi. e(«Yncal c- <jonvi€<^i»of\ afv^ fOOST coocejilyolones QS6oroe yeoiu stfe
j4^ocywhere
Ta noa -^ec^ cat)€6 \\ood slreoio^-recoone^u^ ib»^ fOOvi<^ <5^ /close^ Ijoon^ar^
ioes cro&Ss no(\
Vwccc^e coaveaiorv is the Sua ^ i ^^r'wcrv A< 'iaC, a(\^ rcco(\r»e<^>
v\5coys -\^e vleraclroa \s \n res"\(^oc^ft\^side, veoor>ne<^(oa
~TrarvS|)lQr \j^(xc\t Qfv^ piar cap size \/aru vo ar^v)ior vo^ aofi^ (;ke subsom c^c\e
ft.loio PaUerns
