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Jasper S. Halekas Space Sciences Laboratory

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Presentation on theme: "Jasper S. Halekas Space Sciences Laboratory"— Presentation transcript:

1 Lunar precursor effects in the Terrestrial magnetosphere and solar wind
Jasper S. Halekas Space Sciences Laboratory University of California, Berkeley

2 The Lunar Space Plasma Environment: Pre-ARTEMIS

3 Precursor Effects in the Terrestrial Magnetosphere
All Electrons Upgoing e- (0-15°) Downgoing e- ( °) fp fce Spin Tone EFI Background EFI FFT fp SCM FFT fce B Wavelets fci B Field

4 Free Energy Sources: Reflected Electrons in Magnetosphere
Converging Magnetic Field Lines above Crustal Magnetic Fields Loss Cone Beam Plasma Electrons Follow Magnetic Field Lines and Reflect from E & B Beam + Loss Cone: Produced By Combined Magnetic & Electrostatic Effects Near Surface Secondary Electrons Accelerated Upward Downward Electric Field E = - U Δ

5 Polarization Properties
Waves propagating anti-parallel to field EXB E B B0 Narrowband Coherent Right-Handed Parallel-Propagating Wave properties all consistent with parallel-propagating whistlers coming down the magnetic field line towards the Moon

6 Instability Conditions
Streaming instabilities where df/dv|| positive EFI SCW Whistlers correlate with edges of loss cone: i.e. df/dvperp positive Reduced Distribution Function Whistler Mode: ω/k, (ωce-ω)/k

7 Ions in the Mix? Waves near fci modulate both the electron beam and the whistlers Possible sources: Electron beam, shadowed ion distributions, bi-ion streaming ICWs? Electron Beam Modulated Loss Cone Modulated Whistlers Modulated FGM Wavelets Proton & Helium Cyclotron Frequencies

8 Precursor Effects in the Solar Wind
Ions Upgoing e- (0-15°) Downgoing e- ( °) EFI FFT SCM FFT B Wavelets B Field SZA of Surface Connection

9 Free Energy Sources: Reflected Electrons in Solar Wind
Trajectory Fitzenreiter et al., 1990 Magnetic Field Convection Electric Field Generalized obstacle with magnetic field gradient and/or electrostatic potential gradient Adiabatic Reflection in dHT Frame Gives you “Ears” in Solar Wind Frame

10 Whistler Cyclotron Resonance Conditions
EFI SCW Reduced Distribution Function (ωce-ω)/k : ω, k on whistler branch

11 Ion Observations P2 Ions P1 Ions P1 Reduced Dist. Funct.
Foreshock Ions P1 Ions Reflected Protons P1 Reduced Dist. Funct. P1 Power Spectrum Parallel-Propagating P1 Propagation RH, LH P1 Ellipticity

12 Free Energy Sources: Reflection From Crustal Magnetic Fields
Reflected Protons Follow Pickup Ion Trajectories Solar Wind Gyrating Protons Distribution Near Cycloid “Cusp” IMF SW Reflected Proton Fluxes Lue et al., 2010

13 Pickup Ion Trajectories
Reconstructed Ion Trajectories Connected Unconnected Surface Crustal Magnetic Field

14 Ion Reflection Source Map
26 Event Periods, June 29 – August 31

15 Lunar Precursor Effects

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