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首页> 外文期刊>Journal of geophysical research >E-Field Effects on Day-To-Day Variations of Geomagnetic Mid-Latitude Sporadic E Layers
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E-Field Effects on Day-To-Day Variations of Geomagnetic Mid-Latitude Sporadic E Layers

机译：E-Field Effects on Day-To-Day Variations of Geomagnetic Mid-Latitude Sporadic E Layers

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摘要

This study investigates the effects of the electric fields (E-fields) on day-to-day variations in geomagnetic mid-latitude sporadic E layers (EsLs) using a numerical ionospheric model. It is widely accepted that geomagnetic mid-latitude EsL dynamics depend largely on wind shear variations. In contrast, E-field effects on geomagnetic mid-latitude EsLs have not been investigated extensively and are still little known. Previous observations have reported that E-fields change EsL heights by only several kilometers. However, no studies have investigated E-field effects on day-to-day EsL variations. Recently, our numerical ionospheric model succeeded generally in reproducing day-to-day EsL variations driven by winds at geomagnetic mid-latitudes. In this study, using the ionospheric model, we conducted EsL simulations including both E-fields and winds, to elucidate how E-fields affect day-to-day EsL variations at geomagnetic mid-latitudes. It was found that zonal and meridional/vertical E-fields change the vertical EsL dynamics above & SIM;110 km. Below & SIM;130 km, where most Es layers appear, vertical/meridional E-fields are more effective for EsL dynamics than zonal E-fields. During the day, E-fields pump metal ions from the lower ionosphere to more than 110 km. Pumping facilitates the formation of daytime EsLs above & SIM;110 km. In the evening, E-fields drive downward ion motion and increase the descending EsL density and occurrence. E-fields affect day-to-day EsL variations at geomagnetic mid-latitudes by altering background metal ion distribution and transport.

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