Testing the Hill model of transpolar potential with Super Dual Auroral Radar Network observations

Details Testing the Hill model of transpolar potential with Super Dual Auroral Radar Network observations Testing the Hill model of transpolar potential with Super Dual Auroral Radar Network observations

Jan 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30a...2s&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 1, pp. 2-1, CiteID 1002, DOI 10.1029/2002GL015426

Physics

6

Ionosphere: Ionosphere/Magnetosphere Interactions (2736), Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Ionosphere: Plasma Convection, Ionosphere: Ionospheric Dynamics, Ionosphere: Electric Fields (2712)

Scientific paper

We use a data set consisting of periods for which the transpolar ionospheric potential (Φpc) is well-determined by Super Dual Auroral Radar Network (SuperDARN) data to test the Hill model. The Hill model, as formulated by Siscoe et al. [2002], specifies Φpc as a function of solar wind speed and ram pressure, the interplanetary magnetic field, the reconnection electric field (Er), and the ionospheric conductance (Σ). The periods used in our study were identified as times when the interplanetary electric field was quasi-stable for and SuperDARN coverage was sufficient to determine Φpc. SuperDARN-determined Φpc (ΦpcSD) is compared to Φpc determined using the Hill model (ΦpcHill) for 1317 10-min periods. A minimum in the root-mean-square difference between ΦpcSD(Er) and ΦpcHill(Er) i;s achieved when Σ = 23 S and a constant potential, Φ0 = 17 kV, are used. Some aspects of the data agree very well for these values of Σ and Φ0, including the mean value of Φpc(Er) and that both data sets clearly indicate saturation at higher values of Er. The ram pressure dependence of ΦpcHill, however, is inconsistent with that of ΦpcSD and suggests that Σ should be lower than 23 S. There is also significantly more variability in ΦpcSD for all values of Er than the Hill model predicts.

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