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Investigating Density and Payload Potential in HM and ERPA: Insights from PFISR and HF Waves

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This study explores the density and payload potential in the context of High-Mass (HM) measurements and Electron Retarding Potential Analyzer (ERPA) data. It examines the inconsistencies in initial density assessments based on HF waves and considers the implications of rammed thermal ions, focusing on O+ and electron measurements through Langmuir probes. The analysis addresses variations in electron flux and identifies density profiles affected by precipitating particles while comparing energetic electron responses and their implications for auroral observations.

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Investigating Density and Payload Potential in HM and ERPA: Insights from PFISR and HF Waves

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Presentation Transcript

  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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