Neutral Parcel Transport in the High Latitude F-Region

Killeen, T. L.; Roble, R. G.

doi:10.1007/978-94-009-5295-9_19

Cited by 10 publications

(1 citation statement)

References 18 publications

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“…The storm-time meridional disturbance winds are mostly equatorward with disturbance velocities of~500-800 m/s at high latitudes (Babcock & Evans, 1979;Emery et al, 1999;Richmond & Lu, 2000;Fuller-Rowell et al, 2002;Gardner & Schunk, 2010). Ion drag and pressure gradient force are the primary drivers for the high-latitude meridional wind changes in the E and F regions (e.g., Killen & Roble, 1986;Richmond et al, 2003). Storm-time high-latitude meridional wind perturbations can quickly propagate to lower latitudes in the upper thermosphere.…”

Section: Introductionmentioning

confidence: 99%

A Modeling Study of the Responses of Mesosphere and Lower Thermosphere Winds to Geomagnetic Storms at Middle Latitudes

Wang

et al. 2019

JGR Space Physics

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Thermosphere Ionosphere Mesosphere Electrodynamics General Circulation Model (TIMEGCM) simulations are diagnostically analyzed to investigate the causes of mesosphere and lower thermosphere (MLT) wind changes at middle latitudes during the 17 April 2002 storm. In the early phase of the storm, middle‐latitude upper thermospheric wind changes are greater and occur earlier than MLT wind changes. The horizontal wind changes cause downward vertical wind changes, which are transmitted to the MLT region. Adiabatic heating and heat advection associated with downward vertical winds cause MLT temperature increases. The pressure gradient produced by these temperature changes and the Coriolis force then drive strong equatorward meridional wind changes at night, which expand toward lower latitudes. Momentum advection is minor. As the storm evolves, the enhanced MLT temperatures produce upward vertical winds. These upward winds then lead to a decreased temperature, which alters the MLT horizontal wind pattern and causes poleward wind disturbances at higher latitudes.

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Section: Introductionmentioning

confidence: 99%

A Modeling Study of the Responses of Mesosphere and Lower Thermosphere Winds to Geomagnetic Storms at Middle Latitudes

Wang

et al. 2019

JGR Space Physics

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

Smith¹,

Henriksen

Deehr

et al. 1985

Planetary and Space Science

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The thermosphere as a sink of magnetospheric energy: A review of recent observations of dynamics

Killeen

1985

Advances in Space Research

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The study of the dynamics and thermodynamics of the earth's upper atmosphere has made significant progress over the past few years owing to the availability of new global-scale data sets from the Dynamics Explorer satellites. The thermospheric wind and temperature fields at high latitude have been observed to depend strongly on forcing processes of magnetospheric origin. A key momentum source is due to the drag effect of ions convecting in response to electric fields mapped down on the ionosphere from magnetospheric boundary regions. Likewise, an important heat source derives from Joule or frictional dissipation due to ion/neutral difference velocities governed, in turn, by magnetospherio forcing. In this paper we discuss the progress made over the last 2-3 years initiated by the new satellite measurements and we review published data on ion and neutral motions in the context of the energy and momentum coupling between the magnetosphere and the ionosphere/neutral upper atmosphere. The observations indicate the existence of a "flywheel effect" which implies direct feedback from the neutral thermosphere to the magnetosphere via the release of energy and momentum previously "stored" in the neutral thermosphere.

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Neutral Parcel Transport in the High Latitude F-Region

Cited by 10 publications

References 18 publications

A Modeling Study of the Responses of Mesosphere and Lower Thermosphere Winds to Geomagnetic Storms at Middle Latitudes

A Modeling Study of the Responses of Mesosphere and Lower Thermosphere Winds to Geomagnetic Storms at Middle Latitudes

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

The thermosphere as a sink of magnetospheric energy: A review of recent observations of dynamics

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