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Dynamic features of plasmapause revealed by in situ measurements from Van Allen and THEMIS Probes

Dynamic features of plasmapause revealed by in situ measurements from Van Allen and THEMIS Probes. Sam Califf et al. Density from Spacecraft Potential. RBSP N = 7241* exp (- V sc /0.356) + 114.6* exp (- V sc /2.073)

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Dynamic features of plasmapause revealed by in situ measurements from Van Allen and THEMIS Probes

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  1. Dynamic features of plasmapause revealed by in situ measurements from Van Allen and THEMIS Probes Sam Califf et al.

  2. Density from Spacecraft Potential • RBSP • N = 7241*exp(-Vsc/0.356) + 114.6*exp(-Vsc/2.073) • Calibrated with upper hybrid (EMFISIS), June 3-5, 2013, RBSPA fit applied to RBSPB • Scott Thaller • THEMIS • THEMIS A (different parameters for each probe) • N = (10^(-Vsc/25.5)*18000 + 10^(-Vsc/5)*6e4 + 10^(-Vsc/2)*5e6 + 10^(-Vsc/0.4)*1e11)/Vthermal • Brian Walsh, Toshi Nishimura • Plasmapause: minimum radial distance with density below 50 cm-3

  3. Plasmapause Observations • Minimum Lpp = 2.7 near midnight at ~50 hr

  4. Plasmapause Observations • Minimum Lpp = 2.7 near midnight at ~50 hr • Duskside bulge

  5. Plasmapause Observations • Correlation with Dst • Minimum Lpp = 2.7 near midnight at ~50 hr

  6. Plasmapause inferred from MagEIS measurements • 38 keV injection stops at L = 2.75 • Lpp from spacecraft potential = 2.7 Injection stops L = 2.75 Inward diffusion L=3 L=2.5 L=3.25 L=3.5 L=3.75

  7. MagEIS Data

  8. Event: June 27 – July 3, 2013 RBSP • Use RBSP and THEMIS to observe evolution of the plasmasphere THEMIS min Dst ~ 50 hr

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