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

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Presentation on theme: "Density and payload potential HM, Erpa, PFISR, waves."— 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

13

14 Density from LHR?

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

16 ERPA stuff Electron RPA with +4V front screen Skin channel = 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)

17 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)

18 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

19 Another payload, dayside cusp


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