Physics
Scientific paper
Oct 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...10019387g&link_type=abstract
Journal of Geophysical Research, Volume 100, Issue A10, p. 19387-19404
Physics
7
Ionosphere: Auroral Ionosphere, Magnetospheric Physics: Mhd Waves And Instabilities, Magnetospheric Physics: Storms And Substorms, Ionosphere: Current Systems
Scientific paper
A comparison of observations of Pi B magnetic pulsations at the ground with wide-angle photometer measurements of the accompanying auroral luminosity fluctuations has found several cases of well-correlated magnetic and optical pulsations, with periods in the range 15-50 s. This finding strongly suggests that precipitation fluctuations drive at least some of those components of the Pi B signal with periods in this range. We found no luminosity fluctuations associated with the 3-s enhancement of Pi B pulsations. We modeled the magnetic perturbation under a patch of enhanced E region conductivity as it drifts or as its conductivity changes, for circular and strip patch shapes. These idealized models can reproduce some features of the Pi B signature. Most notably, a monotonic variation in the model parameters can produce a reversal in the sense of polarization rotation. A moderate enhancement in the conductivity of a 1-km-wide strip can produce magnetic perturbations with amplitudes typical of Pi B pulsations. .
Burns Gary B.
Grant Ian F.
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