Simulation of the pre‐reversal enhancement in the low latitude vertical ion drifts

By C. Fesen, Geoff Crowley, R. Roble, Arthur D. Richmond, B. Fejer. 2000

197 citations recorded by the source corpus.

Low latitude F region ion motions exhibit strong seasonal and solar cycle dependences. The pre‐reversal enhancement (PRE) in the vertical ion drifts is a particularly well‐known low latitude electrodynamic feature, exhibited as a sharp upward spike in the velocity shortly after local sunset, which remains poorly understood theoretically. The PRE has been successfully simulated for the first time by a general circulation model, the National Center for Atmospheric Research thermosphere/ionosphere/electrodynamic general circulation model (TIEGCM). The TIEGCM reproduces the zonal and vertical plasma drifts for equinox, June, and December for low, medium, and high solar activity. The crucial parameter in the model to produce the PRE is the nighttime E region electron densities: densities ≥ 104 cm−3 preclude the PRE development by short‐circuiting the F region dynamo. The E region semidiurnal 2,2 tidal wave largely determines the magnitude and phase of the daytime F region drifts.

Subfields: Aerospace Engineering, Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/5fb095d5a91a9183735aa2e836ef730996bfde90

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Citations in the corpus

An investigation into the influence of tidal forcing on F region equatorial vertical ion drift using a global ionosphere‐thermosphere model with coupled electrodynamics (2001, background): “In this regard our results are in agreement with similar studies undertaken recently using the National Center for At-mospheric Research Thermosphere Ionosphere Electro-dynamic General Circulation Model (NCAR TIEGCM) [Fesen et al., 2000].”
Tropospheric tidal effects on the middle and upper atmosphere (2009, background): “[7] Migrating tides excited by the absorption of solar infrared radiation in the troposphere have long been included in TIME-GCM simulations, since their impacts on the atmosphere aloft are well established [e.g., Hagan, 1996; McLandress et al., 1996; Fesen et al., 2000].”
The influence of atmospheric tide and planetary wave variability during sudden stratosphere warmings on the low latitude ionosphere (2013, background): “[5] Amplitude and phase changes of the migrating semidiurnal tide (SW2) are known to significantly alter the local time variation of the low latitude vertical plasma drift velocity [Fesen et al., 2000].”
C/NOFS: a Mission to Forecast Scintillations (2004, methodology): “Recent studies of the PRE electric fields with the TIEGCM model [Fesen et al., 2000] coupled to the mesospheric National Center for Environmental Prediction model suggest that the variability of the eastward electric field is modulated by the lower-altitude drivers.”
Connections between deep tropical clouds and the Earth's ionosphere (2007, background): “Any variations in lower thermospheric daytime winds, such as those associated with atmospheric tides will affect the equatorial fountain [e.g., Fesen et al., 2000].”
On monthly/seasonal/longitudinal variations of equatorial irregularity occurrences and their relationship with the postsunset vertical drift velocities (2008, unknown): “However, from many theoretical simulation models published in the literature [e.g., Batista et al., 1986; Crain et al., 1993; Eccles, 1998a, 1998b; Fesen et al., 2000; Vichare and Richmond, 2005], it is understood that the flux tube integrated Pedersen conductivity as well as the longitudinal grad”