publications in comparative magnetospheres siscoe, g. l.: towards a comparative theory of...
DESCRIPTION
Comparative CME and Magnetosphere Phenomena Magnetosheath Draping Turbulence Accretion/reconnection ICME/Magnetosphere In-transit cooling interchange reconnection CME/Plasmoid Dynamics Acceleration & propagation Close-Field-Line Heating Flares and ring current Eruption Dynamics Reconnection instability scenarios Energetic Particles Shock acceleration Reconnection acceleration Plasmoid-Like Structures BBFs Solar wind examples Reconnection in solar windTRANSCRIPT
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Publications in Comparative Magnetospheres
• Siscoe, G. L.: Towards a comparative theory of magnetospheres, in Solar System Plasma Physics, Vol. II, edited by C. F. Kennel, L. J. Lanzerotti, and E. N. Parker, North-Holland Publishing Co., 299-402, 1979.
• Lanzerotti, L. J., and S. M. Krimigis: Comparative magnetospheres, Physics Today. 38, 24-32, 1985.
• Vasyliunas, V. M.: Comparative magnetospheres: Lessons for Earth, Advances in Space Research, 33, 2113-2120, 2004.
• Blanc, M., R. Kallenbach, and N. V. Erkaev: Solar system magnetospheres, Space Science Reviews, 116, 227-298, 2005.
• Russell, C. T.: New horizons in planetary magnetospheres, Advances in Space Research, 37, 1467-1481, 2006.
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Comparative CME and Magnetosphere PhenomenaMagnetosheath
• Draping• Turbulence• Accretion/reconnection
ICME/Magnetosphere• In-transit cooling • interchange reconnection
CME/Plasmoid Dynamics• Acceleration & propagation
Close-Field-Line Heating• Flares and ring current
Eruption Dynamics• Reconnection instability
scenariosEnergetic Particles
• Shock acceleration• Reconnection acceleration
Plasmoid-Like Structures• BBFs• Solar wind examples• Reconnection in solar wind
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Pre-Eruption• Flux cancellation for CMEs &
flux buildup for substormsEruption
• Instability mechanisms for CMEs and substorms
Post-Eruption• Heating on closed field lines• Current sheets and blobs• CME/plasmoid acceleration and
propagation• In-transit cooling and magnetic
transfigurationParticle Energization
• Reconnection and shock models
Sheath Phenomena• Draping, turbulence, accretion
and reconnection
Comparative CME and Magnetosphere Phenomena
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Reconnection in Solar Corona and Geotail
Same absolute scale in both pictures
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Draping in Terrestrial & ICME Magnetosheaths
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ICME
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E14
00deg
W11
ICME
10 Hours
W02
Kaymaz and Siscoe 2006
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Dawn-Dusk Asymmetry in |B|Model and IMP 8 Data Compared
Weak field on dawn side
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B (nT)
EastFlankWeak
WestFlank
Strong
1.3 A
U
Lat = 10o
East-West Asymmetry in |B|
In ICMEs
CCMC-Cone Model
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WANG ET AL.: GEOEFFECTIVE HALO CMES (2002) ZHANG ET AL. SOLAR SOURCES OF MAJOR GEOMAGNETIC STORMS (2003)
Westside CMEs More Geoeffective
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Top View Front View
Dawn-Dusk Draping Asymmetry in IMF Bz
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0 1 2 3 4 5
nT
|Bz|
Boundary of Body
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B (nT) Blat (nT)
East Flank
Strong
EastFlankWeak
WestFlankWeak
WestFlank
Strong
1.3 A
U
Lat = 10o Lat = 20o
East-West ICME Draping Asymmetry in IMF Bz
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Approx. Boundaryof Disturbed Solar Wind
Blat (nT)
1 AU
Longitude (deg)
Latit
ude
(deg
)
East Flank
Strong
WestFlankWeak
East-West ICME Draping Asymmetry in IMF Bz
Siscoe, MacNeice and Odstrcil 2007
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0o
45o
90o
135o
180o
BowShock
Magnetopause
0o
45o
90o
135o
180o
BowShock
Magnetopause
Magnetosheath Accretion
IMF clock angle
Computed Field Strength on StagnationStreamline inEarth’s Magnetosheath(no accretion)
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Measured Field Strength Near StagnationStreamline inICME Magnetosheaths(accretion)
Magnetosheath Accretion
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Similar CME and Substorm Eruption Scenarios
ThermalBlast Dynamo Tether
ReleaseIMF
Connec.Recon.
Inst.Config.
Inst.Current.
Inst.Mass
Exchng.MICInst.
Triggered.Diseqlib.
Directly Driven Blocking-Release
Drc
tly
Drv
nB
lock
ing-
Rel
ease
Dis
-eq
lb.
TetherStraining R
CME
SUBSTORMTether
Straining BMass
Loading
Disequilib.
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Substorm CME
Example
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Melon-Seed Magnetic Geometry
Forbes
Mikic and Linker
LowZhang
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Forbes’ Model
Bo
Ba
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2 4 6 8 10246810
Ba=8 G
6 G
4 G
2 G
1 G
0.1 G
Speed (km/s)
Bo=10 G, Density Ratio=1, Cd=0
Distance from Sun Center (Rs)
500
1000
1500
2000
Distance from Sun Center (Rs)
Bo=20 G
15 G10 G
6 G
Ba=5 G, Density Ratio=1, Cd=0
Velocity Profiles Obtained with Melon-Seed Model
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1313
Cliver et al. (1990) Owens et al. (2005)
Elliott et al. (2006)
Ave
Num
ber D
ensi
ty a
t 1 A
U (c
m-3)
ICME Speed at 1 AU (km/s)
(a)
(d)(c)
(12.4, 12.9)(25.5, 26.4)
Gopalswamy et al. (2001)
Initial CME Speed (km/s)
Mea
n A
ccel
erat
ion
to 0
.76
AU
(m/s
/s)
(b)
*
*
**
(65.2, 64.7)
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Bo (G) Ba/Bo Density Ratio
Speed (km/s) Density (cm-3)
Green Circle
40 0.9 0.26 887 1.0
Turquoise Circle
25 0.9 0.3 754 1.5
Red Circle 15 0.8 0.4 693 1.8
Orange Circle
5 0.8 0.5 516 4.5
Purple Square
20 0.3 1.0 678 2.0
Purple Diamond
30 0.11 2.0 634 2.3
Purple Cross 40 .065 3.0 628 2.5
Green Cross 15 0.33 3.0 827 9.4
Red Asterisk 15 0.53 2.0 649 2.3
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Forbes CME
Hones TPE
Slavin et al. 1985
0 50 100 150 200
200
400
600
800
1000
Distance from Sun (Rs) and Earth (Re)
Velo
city
(km
/s)
InterplanetaryCME
GeotailPlasmoid
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Pre-Eruption• Flux cancellation for CMEs & flux
buildup for substormsEruption
• Instability mechanisms for CMEs and substorms
Post-Eruption• Heating on closed field lines
• Current sheets and blobs• CME/plasmoid acceleration and
propagation• In-transit cooling and magnetic
transfigurationParticle Energization
• Reconnection and shock modelsSheath Phenomena
• Draping, turbulence, accretion and reconnection
Comparative CME and Magnetosphere PhenomenaPre-Eruption
• Forbes/Hughes/Bhattacharjee
Eruption• Forbes/Hughes/Bhattacharjee/
ReevesPost-Eruption
• Raymond/Golub/Korreck/Reeves/Spence
• van Ballegooijen/Hughes• Forbes/Siscoe/Goodrich/Raeder
• Owens/Crooker/Siscoe
Particle Energization• Lee/Schwadron/Korreck
Sheath Phenomena• Farrugia/Smith/Richardson/
Siscoe/Crooker