THEMIS in the inner magnetosphere:
Current progress, Future plans and
Collaboration with ERG
• Introduction
– THEMIS instrumentation, orbit and dataset
• Extended Baseline mission
• THEMIS results in the inner magnetosphere
• Summary
ERG, SCOPE and Beyond
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Inner Magnetosphere, Nov 27, 2008
Instrument overview
EFIs
SCM
ESA
SST
FGM
Tspin=3s
Probe instruments:
ESA: ElectroStatic Analyzer
(coIs: Carlson and McFadden)
SST: Solid State Telescopes (coI: Larson)
FGM: FluxGate Magnetometer
(coIs: Glassmeier, Auster & Baumjohann)
SCM: SearchCoil Magnetometer (coI: Roux)
EFI: Electric Field Instrument (coI: Bonnell)
ERG, SCOPE and Beyond
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Inner Magnetosphere, Nov 27, 2008
THEMIS Extension (FY10,11,12)
ERG, SCOPE and Beyond
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Inner Magnetosphere, Nov 27, 2008
Extended THEMIS Baseline (P3,P4,P5)
• At the Magnetotail, Study:
• With first ever:
– Nature of the near-Earth current sheet
– Dissipation of bursty fast flows
– Simultaneous dR-dZ separations, 0.1-1RE
– Clustered orbits study the 8-12RE region
• Result:
– Ability to map and model key
instability region
2010-04-10 00:00:00
Z
FAST
P4
P3
X
X
P5
Y
ERG, SCOPE and Beyond
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Inner Magnetosphere, Nov 27, 2008
Extended THEMIS Baseline (P3,P4,P5)
• At Inner Magnetosphere, Study Role of: • Using novel:
– ULF/VLF/EMIC waves on ion, electron
energization/losses
– Large electric fields on storm time ring current
– 0.1-2RE separations to resolve
temporal/spatial evolution of gradients
– daily conjunctions: PFISR, S-DARN
• Result:
– Comprehensive AC waves and E-fields models
P3 P4
P5
ERG, SCOPE and Beyond
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Inner Magnetosphere, Nov 27, 2008
Extended THEMIS Baseline (P3,P4,P5)
• At Subsolar Magnetopause, study:
• Using novel:
– Asymmetric reconnection: dynamics, evolution
and role of cold ions
– Internal FTE structure and electron acceleration
• Result:
– Simultaneous dR-dZ separations at
0.1-0.5RE monitor inflow and outflow
– Cluster-like separations at subsolar
region
– Hall-physics of subsolar magneto-pause
reconnection, paves way to MMS
2010-04-10 00:00:00
Z
P4
P5
ERG, SCOPE and Beyond
P3
[THEMIS
Coast Phase
Mozer et al.
GRL]
X
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Inner Magnetosphere, Nov 27, 2008
EMIC waves
1
Usanova et
al.,
GRL, 2008
3
- Driven by SW Pdyn
2
- Confined to L=5-6.5
- Structured, with good
ground-space correlation
ERG, SCOPE and Beyond
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Inner Magnetosphere, Nov 27, 2008
Ring Current
Ions
Dst storm index
Wang et al.,
GRL, 2008
Electrons
TH-B
TH-B
TH-D
TH-D
TH-B
TH-B
- Ions penetrate deep into the inner magnetosphere, and remain after storm.
- Electrons also come close to Earth, but decay fast after storm recovery.
ERG, SCOPE and Beyond
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Inner Magnetosphere, Nov 27, 2008
Substorm Injection
Westward Propagation
97A
Angelopoulos et al.,
First Results from THEMIS,
Space Sci. Reviews, 2008
ERG, SCOPE and Beyond
046
Speed: 1MLT/min
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Inner Magnetosphere, Nov 27, 2008
Injection Simulated
as localized pulse
Liu, Wenlon et
al., JGR, 2008
ERG, SCOPE and Beyond
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Inner Magnetosphere, Nov 27, 2008
Plasma Sheet
Injections
Runov et al.,
GRL, 2008
Ions, TH-C, B, E
Electrons, TH-A
-Nose structure, temporal
-Electron injection local, transient
ERG, SCOPE and Beyond
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Inner Magnetosphere, Nov 27, 2008
Generation of
whistler emissions
•
Li et al.,
JGR, 2008
Low and upper band chorus emissions correlate
with 5-10keV electron anisotropy
– 10keV electrons at higher L-shells have sufficient
anisotropy to generate observed wave power
– 1keV electrons can penetrate deep but don’t have the
required anisotropy to generate chorus
– Higher plasma density results in higher amplitudes
ERG, SCOPE and Beyond
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Inner Magnetosphere, Nov 27, 2008
Whistler emissions
•
Cully et al.,
GRL, 2008
Localized, large amplitude chorus emissions
– Bursts of sub-second duration
– Greater than100mV/m
– L~3.5-5.5; dMLT = 1-3 hrs
•
ERG, SCOPE and Beyond
Mean/average not good description of wave field
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Inner Magnetosphere, Nov 27, 2008
KH-wave driven FLRs: Agapitov et al., JGR, 2008
• KH wave seen by THC,B,D,A
– Couples to ULF wave on TH-E
• Driven ULF wave is localized
– Phase change 180o at peak amplitude
ERG, SCOPE and Beyond
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Inner Magnetosphere, Nov 27, 2008
Data availability
ERG, SCOPE and Beyond
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Inner Magnetosphere, Nov 27, 2008
Summary
• THEMIS already presents significant present capability to measure:
– Waves, particles and their interactions from the radiation belts
out to the plasma sheet
• Continuous operations from solar min to solar max
• Can provide plasma sheet sources, measure ULF, EMIC waves for:
– RBSP, ERG, Orbitals and other missions if properly planned
• Can provide rapid crosses of radiation belt electron phase space density
• Multiple satellites can provide information on phase and group velocity
• String of pearls configuration can resolve spatio-temporal ambiguities
• COLLABORATION ACTIVITIES CAN START NOW:
– Mission planning (orbit studies: phasing and conjunction analysis)
– Integrated analysis tools (Ground, THEMIS, and simulation data)
– Science-targeted campaign planning, (e.g., whistler mode generation and effects)
ERG, SCOPE and Beyond
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Inner Magnetosphere, Nov 27, 2008