Enhanced antisunward convection and F region scintillations at mid-latitudes during storm onset

Details Enhanced antisunward convection and F region scintillations at mid-latitudes during storm onset Enhanced antisunward convection and F region scintillations at mid-latitudes during storm onset

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....9311537f&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Oct. 1, 1988, p. 11537-11542.

Physics

13

Convective Flow, F Region, Magnetic Storms, Magnetohydrodynamic Flow, Scintillation, Midlatitude Atmosphere, Radar Measurement, Thermosphere, Winds Aloft

Scientific paper

Millstone Hill, MA, USA, radar observations over a wide span of latitudes detail the onset of 300 m/s antisunward (westward) convection at midlatitudes and low latitudes in the morning sector as a region of storm-enhanced sunward convection retreats poleward. Ring current observations reported by Lui et al (1987), suggest that the magnetospheric shielding layer was coincident with the observed reversal between sunward and antisunward convection. A strong southward component of the F region neutral wind is observed at latitudes equatorward of the convection reversal. These observations are in agreement with the model of Spiro et al. (1988) who find that storm-enhanced neutral winds at latitudes equatorward of the shielding layer can generate a long-lived perturbation electric field in the inner magnetosphere. The observations show the growth of the subauroral electric field as the shielding boundary moves poleward. The 136-MHz scintillations were observed in both the auroral sunward convection region and the region of subauroral antisunward convection when the convection electric fields exceed 5 mV/m.

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