1. THEMIS and ARTEMIS Status

2. In summary Senior Review 2010 Results Good:
THEMIS extended through 2014 (with small decline in )
ARTEMIS extended through 2014 as well (details pending)
Expect new /revised contract with GSFC to account for uptick due to ARTEMIS
Plan to have visiting scholars (6mo. to 1yr) at UCLA, UCB
Only negative was SST calibration. Plans taken to:
Offload work from Davin who is busy on Maven, SP+
Perform calibrations, modeling at UCLA
Mirror some efforts at UCB on Maven
Plan to ramp up inner magnetosphere activities
Plan to continue with mode adjustments for ARTEMIS

3. THEMIS Extension (FY10,11,12)

4. FY 10/11/12 FY 13/14 Extended Mission: THEMIS probe separations
Kinetic: 100km – 5000km
Global: 2RE – 8RE
FY 10/11/12
FY 13/14
:00:00
:00:00
Tail or Dayside Z Z P5 P4 P4 P3
X or -X
X or -X
Inner magnetosphere P5 P3
FY13: hrs P3
FY14: hrs

5. Tail from kinetic scales: FY11/12
Interaction of reconnection jet (or dipolarization front) with the inner
magnetosphere and its role in triggering substorms
THEMIS Burst data Bz P1
(nT) Bz P2 Z
(nT)
FY 11/12 objective: Physics of interaction between flow bursts and inner magnetosphere (injections?) Bz P3
Jy ~ 100 nA/m2 X
(nT) z P3 P4
intense
waves E
(Hz) P3 z x P5 P3
30 keV
electrons (f)
95 keV
Runov et al. [2010]

6. Subsolar magnetopause from kinetic scales: FY11/12
Microphysics of asymmetric reconnection, pathfinder for MMS
North-south asymmetry in asymmetric reconnection
Evolution of reconnection layer with increasing distance from X-line
:00:00 P3 P4 P5 X Z
Electron jet only north of X-line
Z separation = km
= ion skin depths
Pritchett and Mozer [2009]

7. Phase Space Density (PSD)
Inner magnetosphere kinetic processes: FY11/12
Role of waves in particle acceleration/loss
An RBSP pathfinder as solar max ramps up
Convection
Radial
Diffusion
Local
Acceleration *
* *
THEMIS spacecraft observe:
Plasma distributions generating waves
Waves responsible for acceleration/scattering/loss
Electric fields that transport particles
Magnetic fields that guide particle motion
And thus:
Separate spatial from temporal effects
Determine spatial extent of sources/sinks
Quantify radial PSD gradients
Distinguish between competing models
Phase Space Density (PSD) * * * * * *
Radius (L-shell)

8. Inner magnetosphere: FY13/14 The global view at Solar Max
Exploring the relationship between particle sources/sinks and the inner magnetosphere
An RBSP partner, continuously monitor sources/sinks at 12RE
Broadly-spaced THEMIS spacecraft observe:
Source region plasmas and fields
Other radiation belt drivers: transmitted shocks, pressure pulses, boundary layer waves and substorm injections
..thus constraining radiation belt models
FY 11/12 (Gaps)
FY13/14 (Gaps Filled)

9. ARTEMIS (P1 and P2) Angelopoulos, 2010 Sibeck et al., 2010
Lissajous Phase (Oct ’10 – Apr Jul’11)
Note: First 3 months: opposite sides,
Next 3 months: same side
Translunar injection phase (Oct ’09 – Oct ’10)
Note 1: Orbit Raise Maneuvers (ORMs) completed flawlessly, targeting complete!
Lunar Orbit Phase (AprJul ’11 – Sep ’12)
Note: P1 retrograde, and P2 prograde, such that orbital separations and separation vectors cover full parameter space
Angelopoulos, 2010
Sibeck et al., 2010
Halekas et al., 2010
Bester et al., 2011
Swetser et al., 2011

10. Magnetotail In the Magnetosphere, study: Result: In conjunction with:
Particle acceleration: X-line or O-line?
Reconnection: 3D character and global effects
Turbulence: Drivers and effects
Result:
Reveal 3D distant tail, dynamics
In conjunction with:
Solar wind monitors:
ACE, WIND, STEREO
Inner magnetosphere monitors:
THEMIS, Cluster and Geotail
Using the first:
Two point: dX, dY measurements
…at scales from ion gyroradius to several RE

11. Solar Wind/Wake First Flyby When Moon is in the Solar Wind:
Seed population for solar energetic particles
Nature of elusive low-shear reconnection
Properties of inertial range of turbulence
Near the Moon (Wake):
Structure and evolution of lunar wake
Particle acceleration and dynamics at wake
Moon as an analogue for other airless bodies
Using first of kind:
…two point measurements at scales RE, ideal for two-point correlations within wake and between wake and solar wind
Bonus!!
Solar wind monitor for lunar and other heliophysics science
ARTEMIS
First
Flyby
Moon/
ARTEMIS

12. Wake Update: First Flyby!
Models converging, still lots to understand
Models help identify alphas and protons
Models identify exiting electron beam as accelerated penetrating core/halo electrons from entry side
Models predict similar beam on entry side which is not clearly observed
0-15° °
Spectra Corrected for S/C Potential

13. ART-THM conjunction P5 P1 P2 P3 P2
P3,4,5 P4 P1

14. In short
Many more discoveries from THEMIS and ARTEMIS together expected.
Analysis tools in conjunction wth ERG and SD are being developed.
Knowledge gained in the next 2 years will set the stage for RBSP and MMS. THEMIS plans to position its instrument modes and orbits to collaborate with both missions.