Auroral energy flow budget as a function of altitude: How does energy arrive from the magnetosphere? Pekka Janhunen, FMI/Space/Helsinki Annika Olsson,

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Auroral energy flow budget as a function of altitude: How does energy arrive from the magnetosphere? Pekka Janhunen, FMI/Space/Helsinki Annika Olsson, Unaffiliated (was:IRF/Uppsala) Christopher Russell, UCLA/Los Angeles Harri Laakso, ESA/ESTEC Nikolai Tsyganenko, NASA/GSFC Lars Blomberg, KTH/Stockholm Acknowledgements: Andris Vaivads

Plan of presentation ● Poynting flux as function of altitude ● Comprehensive statistical study using 5 years of Polar data (EFI + MFE) ● Locus of Alfvenic electron acceleration (“Alfven Resonosphere”) ● Fraction of electron precipitation powered by Alfvenic acceleration

Example Polar EFI and MFE data: E-field

Polar B-field

Poynting flux from Polar E-field and B-field

Basic statistical plot from Polar data MLT 18-06, ILAT Kp>2 red, Kp 0-2 blue

MLT-decomposed Polar statistics MLT MLT MLT 18-22

Auroral energy budget ● DC Poynting dominates ● AC small, but stepwise transition for Kp>2 Low Kp High Kp

Same data; only AC; 3 Kp ranges (blue: 0-2, green: 2-4, red: >4)

Electron precipitation energy budget ● AC Poynting sink at 4-5 R_E ● Compared to electron precipitation (Hardy)

The “Alfven Resonosphere” ● Alfven speed and electron thermal speed in Landau resonance at 4-5 R_E ● Natural explanation for “Alfven Resonosphere” and Poynting sink ● Independent support from dens. & E-field statistics

Conclusions ● 30% particle precipitation (mainly electron), 70% Joule heating ● Alfven waves (~100 km scale) responsible for % of electron precipitation for low- mid-high Kp, respectively ● Alfvenic electron acceleration occurs in the “Alfven Resonosphere” at 4-5 R_E (not in the normal acceleration region) ● ARS explanation: Landau resonance

References ● Janhunen, P., A. Olsson, N.A. Tsyganenko, C.T. Russell, H. Laakso and L.G. Blomberg, Statistics of parallel Poynting vector in the auroral zone as a function of altitude using Polar EFI and MFE data and Astrid-2 EMMA data, Ann. Geophys., in review, ● Olsson, A., P. Janhunen, C.T. Russell and H. Laakso, Alfvenic electron acceleration in aurora occurs in global Alfven Resonosphere region, Phys. Rev. Lett., submitted, ● Janhunen, P., A. Olsson, J. Hanasz, C.T. Russell, H. Laakso and J.C. Samson, Different Alfven wave acceleration processes of electrons in substorms at 4-5 R_E and 2-3 R_E radial distance, Ann. Geophys., 22, , ● Olsson, A., P. Janhunen, J. Hanasz, M. Mogilevsky, S. Perraut and J.D. Menietti, Observational study of generation mechanism of substorm-associated low-frequency AKR emissions, Ann. Geophys., 22, , ● Olsson, A., P. Janhunen, T. Karlsson, N. Ivchenko and L.G. Blomberg, Statistics of Joule heating in the auroral zone and polar cap using Astrid-2 satellite Poynting flux, Ann. Geophys., 22, , ● Janhunen, P., A. Olsson and H. Laakso, Altitude dependence of plasma density in the auroral zone, Ann. Geophys., 20, , ● Janhunen, P., A. Olsson and H. Laakso, The occurrence frequency of auroral potential structures and electric fields as a function of altitude using Polar/EFI data, Ann. Geophys., 22, , ● These and more papers: