Effects of geomagnetic disturbances on neutral winds and temperatures in the thermosphere observed over Millstone Hill

Details Effects of geomagnetic disturbances on neutral winds and temperatures in the thermosphere observed over Millstone Hill Effects of geomagnetic disturbances on neutral winds and temperatures in the thermosphere observed over Millstone Hill

Sep 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.5349b&link_type=abstract

Journal of Geophysical Research, vol. 84, Sept. 1, 1979, p. 5349-5354.

Physics

2

Atmospheric Temperature, Diurnal Variations, Geomagnetism, Magnetic Disturbances, Thermosphere, Wind (Meteorology), Atmospheric Models, Graphs (Charts), Incoherent Scattering, Mass Spectroscopy, Radar Scattering, Transport Properties

Scientific paper

Ionospheric measurements of electron density, electron and ion temperature, and vertical drift made at the Millstone Hill incoherent scatter radar were used to derive the neutral exospheric temperature and the thermospheric neutral wind speed along the magnetic meridian. These parameters provided an input to a dynamic model for the neutral atmosphere over Millstone from which the values of the zonal and meridional winds at 300 km were derived. Geomagnetically disturbed days were analyzed with consideration of the ion heating by the neutral winds, differences in the neutral density from mass spectrometer/incoherent scatter model predictions, and electric field effects. All disturbed days showed enhanced nighttime temperatures, strong equatorward nighttime winds, and transition of the zonal winds from eastward to westward much earlier in the nighttime sector than usual. The strong equatorward winds transport high latitude heat away from the auroral zone and usually maximize after midnight, representing an extension to mid-latitudes of the 'midnight surge' seen at auroral latitudes.

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