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Density and payload potential

Density and payload potential. HM, Erpa , PFISR, waves. Density from HF?. First try inconsistent. Consider rammed thermal ions. But analysis assumes O+ only. How about the e - erpa ? Its skin channel is a langmuir probe with V_b = +4V

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Density and payload potential

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  1. Density and payload potential HM, Erpa, PFISR, waves

  2. Density from HF?

  3. First try inconsistent

  4. Consider rammed thermal ions But analysis assumes O+ only

  5. How about the e- erpa? Its skin channel is a langmuir probe with V_b=+4V But it doesn’t know about phi-s/c; also, no absolute scale

  6. Certainly a density “hole” where precip is; but should there be?

  7. PFISR

  8. Velocity fields as aurora alarm

  9. VLOS

  10. Density

  11. Density profiles

  12. Density from LHR?

  13. Gives few-15*10^3/cc if O+ What if NO+?

  14. ERPA stuff • Electron RPA with +4V front screen • Skin channel = LP @4V • Erpa-peak => energy of peak response • Erpa-hi = electrons greater than 3eV (non-thermal) • Temp: phi_sc = 5kT+Vsphere-skin • (sphere float plus differential charging to skin)

  15. Comparisons of phi-sc Dots: HM peak –Eram Black lines: 5kTe + avg(Vss) sub and fwd, no tweaks Blue lines: aft-erpa-peak fwd-erpa-peak – 0.42 HM cutoff ~1eV ERPA cutoff ~0.8eV Truest: 5kTe+avg(Vss)

  16. Correcting erpa-peak Upper black: truest Bottom black: aftpeak Blue: Aftpeak + afthi*200 True from Te and HM consistent Erpapeaks have payload- dependent DC offset Erpapeaks suppressed by higher energy e- flux

  17. Another payload, dayside cusp

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