Signatures of the midnight open-closed magnetic field line boundary during balanced dayside and nightside reconnectionReportar como inadecuado




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1 Department of Physics 2 BAS - British Antarctic Survey 3 Department of Electronic Engineering 4 William B. Hanson Center for Space Sciences 5 IPS Radio and Space Services

Abstract : The geomagnetic conditions were moderately disturbed Kp = 2 during magnetic midnight on 10 December 1999, when the Tasman International Geospace Environment Radar TIGER, a Southern Hemisphere HF SuperDARN radar, observed a persistent, sharp latitudinal decrease ~ 90 km in spectral width near - 69°L. The line-of-sight Doppler velocity also rapidly declined across this spectral width boundary SWB. The region poleward of the SWB was characterized by high spectral widths >200 m-s, and the start of bursty equatorward and eastward flows >500 m-s, which rapidly expanded equatorward. The relationships between familiar ionospheric and magnetospheric regions were inferred by comparing TIGER data with spectrograms calculated from precipitating particles measured on board the Defence Meteorology Satellite Program DMSP F14 satellite. The high spectral width scatter is often observed, and on this evening it was associated with irregularities forming on the open but soon to be reconnected field lines threading the polar cap ionosphere to the southern tail lobe. The region equatorward of the SWB was characterized by very low spectral widths



Autor: M. L. Parkinson - P. L. Dyson - M. Pinnock - J. C. Devlin - M. R. Hairston - E. Yizengaw - P. J. Wilkinson -

Fuente: https://hal.archives-ouvertes.fr/



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