Studies of theEregion neutral wind in the quiet auroral ionosphere

Abstract. Since the auroral ionosphere provides an important energy sink for the magnetosphere, ionosphere-thermosphere coupling must be investigated when considering the energy budget of the ionosphere-magnetosphere coupling. We present the first Scandinavian ground-based study of high-latitude F-region ion-neutral frictional heating where ion velocity and temperature are measured by the EISCAT incoherent scatter radar as well as neutral wind and temperature being measured simultaneously by a Fabry-Perot interferometer. A geomagnetically active period (Kp = 7– – 5–) and quiet period (Kp = 0+ – 0) were studied. Neglecting the neutral wind can result in errors of frictional heating estimates of 60% or more in the F-layer. About 96% of the local ion temperature enhancement over the neutral temperature is accounted for by ion-neutral frictional heating.Key words: Ionosphere (auroral ionosphere; ionosphere-atmosphere interactions)

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Studies of theEregion neutral wind in the disturbed auroral ionosphere

Journal of Geophysical Research Atmospheres ◽

10.1029/95ja00676 ◽

1995 ◽

Vol 100 (A8) ◽

pp. 14717 ◽

Cited By ~ 41

Author(s):

Satonori Nozawa ◽

Asgeir Brekke

Keyword(s):

Neutral Wind ◽

Auroral Ionosphere

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Meridional thermospheric neutral wind at high latitude over a full solar cycle

Annales Geophysicae ◽

10.1007/s00585-998-1400-3 ◽

1998 ◽

Vol 16 (10) ◽

pp. 1400-1409 ◽

Cited By ~ 25

Author(s):

O. Witasse ◽

J. Lilensten ◽

C. Lathuillere ◽

B. Pibaret

Keyword(s):

Solar Activity ◽

Solar Cycle ◽

Universal Time ◽

Neutral Wind ◽

High Latitudes ◽

Auroral Ionosphere ◽

Neutral Winds ◽

F Region ◽

Eiscat Radar ◽

Thermospheric Dynamics

Abstract. EISCAT radar experiments over a full solar cycle between January 1984 and March 1995 have been used to construct meridional neutral wind patterns in the ionospheric F region. For locally geomagnetically quiet periods the neutral winds have been binned according to season, solar activity, and universal time. The diurnal and seasonal behaviors and the effect of the solar flux are described. An empirical model of the meridional neutral wind for the high latitudes at eight altitudes in the ionospheric F region over a full solar cycle is presented. Results are compared with other recent empirical models.Key words. Auroral ionosphere · Thermospheric dynamics · EISCAT

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Characterization of the auroral ionosphere using optical remote-sensing techniques

10.2514/6.1980-1383 ◽

1980 ◽

Author(s):

R. SEARS

Keyword(s):

Remote Sensing ◽

Optical Remote Sensing ◽

Auroral Ionosphere ◽

Remote Sensing Techniques

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Sensor Development Thermospheric Neutral Wind Measurements

10.21236/ada417309 ◽

2002 ◽

Author(s):

R. A. Heelis

Keyword(s):

Neutral Wind ◽

Sensor Development ◽

Wind Measurements

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On the fast movements of the thermosphere: an interpretation

Annales Geophysicae ◽

10.1007/s00585-001-1651-8 ◽

2000 ◽

Vol 18 (12) ◽

pp. 1651-1656

Author(s):

J. Lilensten ◽

P. O. Amblard

Keyword(s):

Rotation Velocity ◽

Atmospheric Composition ◽

Neutral Wind ◽

Typical Size ◽

F Region ◽

Optical Experiment ◽

Atmospheric Composition And Structure ◽

Composition And Structure ◽

Eiscat Radar

Abstract. We examine the oscillations of the meridional neutral wind in the F region as seen by the EISCAT radar. We propose an interpretation in term of eddies (tourbillons) of typical size of a few tens to a few hundreds of kilometers. The observed rotation velocity is a few hundreds of meters per second. We suggest that the tourbillons are a common feature of thermospheric movements. We propose an optical experiment to check the validity of this assumption.Key words: Atmospheric composition and structure (thermosphere · composition and chemistry) · Ionosphere (ionosphere · atmosphere interactions)

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