Thermospheric winds in the cusp: Dependence of the latitude of the cusp

Smith, Roger W.; Henriksen, K.; Deehr, C. S.; Rees, D.; McCormac, F. G.; Sivjee, G. G.

doi:10.1016/0032-0633(85)90062-5

Cited by 13 publications

(6 citation statements)

References 17 publications

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“…Smith et al [1985] tried to understand the effect of a cusp-related heat source on FPI measurements at Spitzbergen. They were unable to measure winds at local noon using the ground-based instrument, even in winter.…”

Section: Further High-latitude Measurements and Modelingmentioning

confidence: 99%

“…In the past years, some experimenters who use ground-based Fabry-Perot interferometers have tried to identify the effects of cusp-related precipitation on the high-latitude winds at geomagneticaly quiet times. Smith et al [1985] tried to understand the effect of a cusp-related heat source on FPI measurements at Spitzbergen. They were unable to measure winds at local noon using the ground-based instrument, even in winter.…”

Section: Further High-latitude Measurements and Modelingmentioning

confidence: 99%

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Impact of HIWIND balloon measurements on thermospheric density models

Moe

2014

JGR Space Physics

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The recent HIWIND (High-Altitude Interferometer Wind Observations) balloon measurements have revealed persistent equatorward winds in the dayside thermosphere during geomagnetically quiet times. Although this result does not agree with some current thermospheric density models, it is consistent with an earlier thermospheric density model (M1975) which includes the energy input through the magnetospheric dayside cusps during geomagnetically quiet times. We show the thermospheric density distribution with and without the magnetospheric input to illustrate the effect of the density gradient on the winds at high latitudes. We review the early history of the development of our understanding of the energy input to the high-latitude thermosphere. Future HIWIND measurements can add to our understanding and lead to improved models of thermospheric densities and winds.

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Section: Further High-latitude Measurements and Modelingmentioning

confidence: 99%

Section: Further High-latitude Measurements and Modelingmentioning

confidence: 99%

Impact of HIWIND balloon measurements on thermospheric density models

Moe

2014

JGR Space Physics

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“…A Fabry-Perot situated at Svalbard has.been used to determine both the neutral and ion thermospheric dynamics during the polar (winter) night [81][82][83][84][85].…”

Section: Rich -Latitudesmentioning

confidence: 99%

“…For example, optical measurements were made o~the cusp region ion drift velocity from Svalbard, using the Doppler shift of the OII( P -2D) emission [84], and neutral winds in the same region were measured and compared with the results of TGCN predictions [84,86,87]. The capability for measuring ion velocities optically is a relatively new development that opens up the possibility of performing useful studies in ion-neutral momentum coupling.…”

Section: Rich -Latitudesmentioning

confidence: 99%

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Optical measurements of winds and kinetic temperatures in the upper atmosphere

Hernández

Killeen

1988

Advances in Space Research

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was used to determine the thermospheric neutral motions in the auroral zone. These measurements were compared with simultaneously measured ion drifts, obtained with the Chatanika incoherent backscatter radar [73], see Figure 3. This comparison showed that the neutral wind in the evening sector flowed in a generally sunward direction, in correspondence with the direction of ion convection, but opposite to that which would be expected from a consideration of solar heating alone. Further analysis of the 1972-73 data set [74] was presented, together with a modelling study of the auroral momentum equation, to suggest that ion drag was playing an important role in establishing the sunward neutral wind. This work was in accord with independent experimental results using rocket chemical release vapour trail analysis [75-77]. A more recent paper [78] has compared the optical meridional wind measurements made in Alaska during 1972 with determinations of the same parameter made using the Chatanika incoherent scatter radar. Reasonable agreement was found between the two (optical and radar) techniques, both for averaged wind patterns and for simultaneously observed winds from individual nights; this is illustrated in Figure 4. The experimental results from this study were also compared with the predictions of the NCAR-TGCM; the comparison indicated reasonable agreement and was suggestive of a possible heat source poleward of Chatanika.

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