Statistics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa42a06p&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SA42A-06
Statistics
2407 Auroral Ionosphere (2704)
Scientific paper
We have extended our current studies on auroral arc formation and structure (using nonlinear dispersive field line resonance wave model) to include effects arising from the non-Maxwellian electron precipitation. Our previous studies with Maxwellian electron distribution provided us with important insights into the role of feedback interactions that result from perpendicular gradients in the ionospheric conductivity, in the formation and structuring of the auroral arc. The gradient in the conductivity is induced by low energy (150 eV) electrons that originate from the plasma sheet. The outcome of these studies has been found to be consistent with the statistics that strongly support the conclusion that discrete aurorae are formed in regions of very low conductivirty. We have computed the Joule heating rate as well as field line resonance (FLR) damping with various models of ionospheric conductance. Our numerical studies show that even when the driver (exciting FLRs) is turned off after few wave periods, a dispersive FLR disperses through the medium, and enhances its amplitude as it encounters regions of low conductivity that allow further enhancement by the ionospheric feedback mechanism. When the field-aligned current of FLRs is increased to a significant value, soliton structures are excited (Prakash et al., 2001). The width of the solitons determines the scale length at which the auroral arc is structured. Comparison of arc structures using different models of conductance and the FLR damping rates will be presented. Significance of these studies using CANOPUS data will be pointed out. Efforts are in progress to examine the optical signatures (in the ionosphere) of the plasma bubbles that are ejected out of the plasma sheet. Manju Prakash, R. Rankin, and V. T. Tikhonchuk, Auroral arc formation and structuring due to feedback interactions caused by electron precipitation, to be submitted to J. Geophys. Res., 2001.
Prakash Madappa
Rankin Robert
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