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

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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) *exp(-V sc /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^(-V sc /25.5)* ^(-V sc /5)*6e4 + 10^(-V sc /2)*5e6 + 10^(-V sc /0.4)*1e11)/V thermal – Brian Walsh, Toshi Nishimura Plasmapause: minimum radial distance with density below 50 cm -3

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

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

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

Plasmapause inferred from MagEIS measurements 38 keV injection stops at L = 2.75 Lpp from spacecraft potential = 2.7 Inward diffusion Injection stops L = 2.75 L=3 L=3.75L=3. 5 L=3.25 L=2.5

MagEIS Data

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