Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm12b..04o&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM12B-04
Physics
2407 Auroral Ionosphere (2704), 2431 Ionosphere/Magnetosphere Interactions (2736), 2716 Energetic Particles, Precipitating, 2736 Magnetosphere/Ionosphere Interactions
Scientific paper
Data from the Far Ultraviolet Instrument (FUV) on the IMAGE spacecraft and the Polar Ionospheric X-ray Imaging Experiment (PIXIE) and the Ultraviolet Imager (UVI) on board the Polar satellite are used to derive the energy distribution of precipitating particles during substorms. While the ultraviolet imagers can be used to estimate the distributions below ~30-50 keV the X-ray measurements provide information about the electrons up to 100 keV. We estimate the global energy deposition rate (UA) by auroral electrons in the northern hemisphere using data from the different imagers. By deriving the UA from ultraviolet emissions only we find that about 90-100 % of the total energy flux will be estimated during growth phase and expansion phase. However, due to the hard tail above 20-30 keV in the electron spectrum frequently observed during recovery phase only about 80% of the total energy flux will be estimated when only UV emissions are used to estimate UA. Using the time-shifted solar wind measurements (WIND satellite) we calculate the total available kinetic energy in the solar wind (USW) and the predicted energy transport due to merging (epsilon-parameter) prior to and during 7 substorms. Using geomagnetic indices (Dst and AE) we estimate the energy increase of the ring current (UR) and the Joule heating in both hemispheres (UJ). Knowing the most important energy sources and sinks for the magnetospheric-ionospheric (MI) system, we present the energy budget for these substorms. We find that a viscous interaction that transfers 0.15% of the USW in addition to the energy transferred by the epsilon-parameter is sufficient to balance the total energy dissipation UT (=UA+U_R+U_J)
Frey Harald U.
Germany G. G.
Immel Thomas J.
Mende Stephen B.
Ostgaard Nikolai
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