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Tidal control of equatorial vertical ExB drift under solar minimum conditions
  • Han-Li Liu,
  • Astrid Maute
Han-Li Liu
National Center for Atmospheric Research, P. O. Box, 3000, Boulder, CO 80307-3000

Corresponding Author:[email protected]

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Astrid Maute
CIRES/ University of Colorado Boulder
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Observations show that equatorial ionospheric vertical drifts during solar minimum differ from the climatology between late afternoon and midnight. By analyzing WACCM-X simulations, which reproduce this solar cycle dependence, we show that the interplay of the dominant migrating tides, their propagating and in-situ forced components, and their solar cycle dependence impact the F-region wind dynamo. In particular, the amplitude and phase of the propagating migrating semidiurnal tide (SW2) in the F-region plays a key role. Under solar minimum conditions, the SW2 tide propagate to and beyond the F-region in the winter hemisphere, and consequently its zonal wind amplitude in the F-region is much stronger than that under solar maximum conditions. Furthermore, its phase shift leads to a strong eastward wind perturbation near local midnight. This in turn drives a F-region dynamo with an equatorial upward drift between 18-1 hour local times.
01 Mar 2024Submitted to ESS Open Archive
13 Mar 2024Published in ESS Open Archive