Variability in the Equatorial electrojet due to the solar migrating tides
| Autor: | Dwivedi, Divyanshu, Nelapatla, Phani Chandrasekhar, Arora, Kusumita |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Zdroj: | XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
| Popis: | Earth’s lower atmosphere generates daily ionospheric variation during geomagnetic quiet times. Atmospheric waves such as solar and lunar tides, planetary waves, and gravity waves likely cause ionospheric currents that cause daily variations in the geomagnetic field. Among these atmospheric waves, solar migrating tides have significant amplitudes. The vertically propagated migrating diurnal and semidiurnal solar tides affect the Equatorial electrojet (EEJ), and the counter electrojet (CEJ) associated with the variability in the solar radio flux. However existing studies indicate no significant correlation between tidal effects on geomagnetic data and solar activity.In this study, we determine the daily characteristics of EEJ and CEJ signatures from the equatorial observatory (ETT) in the Indian sector over two decades (1980-2002). The EEJ is influenced by diurnal tidal (DW1), semi-diurnal (SW2), ter-diurnal (TW3) and quarta-diurnal (QW4) amplitudes by 46.7%, 28.5%., 17.1%, and 7.5% respectively. These tidal amplitudes are found to be maximum in equinox in comparison to solstices and follow the solar cycle patterns. The instances of strong, moderate, and weak Pearson correlation are observed between solar radio flux (F10.7) and the four tidal amplitudes during different phases of solar cycles (21-23) highlighting that the characteristics of each solar cycle are unlike each other. The discrepancy between the ground observatories and the EEJM-2.0 model may provide constraints on the role of other atmospheric processes on the EEJ. The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|