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  • Guanchun Wei, Jianyong Lu, Jingyuan Li, Fen Tang, Meng Sun. 2024: The Dawn-Dusk Asymmetry in Mesosphere and Lower Thermosphere Temperature Disturbances during Geomagnetic Storms at High Latitude. Earth and Planetary Physics. DOI: 10.26464/epp2024016
    Citation: Guanchun Wei, Jianyong Lu, Jingyuan Li, Fen Tang, Meng Sun. 2024: The Dawn-Dusk Asymmetry in Mesosphere and Lower Thermosphere Temperature Disturbances during Geomagnetic Storms at High Latitude. Earth and Planetary Physics. DOI: 10.26464/epp2024016
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The Dawn-Dusk Asymmetry in Mesosphere and Lower Thermosphere Temperature Disturbances during Geomagnetic Storms at High Latitude

  • Utilizing observations by the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER), the dawn-dusk asymmetry in temperature disturbances within the high-latitude mesosphere and lower thermosphere (MLT) during the main phase of geomagnetic storms was quantitatively assessed in this study. The analysis of five geomagnetic superstorm events indicated that during the main phase, negative temperature disturbances were more prevalent on the dawn side than dusk side in the high-latitude MLT region. The statistical results of 54 geomagnetic storm events also revealed a notable disparity in temperature disturbances between the dawn and dusk sides. At high latitudes, 38.2% of observational points on the dawn side exhibited negative temperature disturbances (less than -5 K), while on the dusk side, this percentage was only 29.5%. In contrast, at mid-latitudes, these proportions were 34.1% and 36.5%, respectively, showing no significant differences. We also conducted a statistical analysis of temperature disturbances at different altitudes, revealing an increase in the proportion of warming disturbances with altitude. Conversely, the proportion of cooling disturbances initially rose with altitude, reaching a peak around 105 km, and then subsequently decreased. These temperature disturbance differences could be explained by the day-night asymmetry in vertical wind disturbances during storm conditions.
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