Effect of the Non-Dipole Field on the Seasonal Variation of the Geomagnetic Sq(Y) ...

• Main Authors: Luo, Hao, Du, Aimin, Tian, Lin
• Format: Conference Object
• Language: unknown
• Published: GFZ German Research Centre for Geosciences 2023
• Subjects: South Atlantic Ocean
• Online Access: https://dx.doi.org/10.57757/iugg23-2135; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018699

<!--!introduction!--> The annual mean (Sq0), annual (Sq1), and semiannual (Sq2) components of the monthly averageddaily amplitude of the geomagnetic Y component during quiet period over several solar cycles at 25 mid-lowlatitudes observatories were separated by means of Fourier analysis. No obvious distinction is found for themorphology of the spatial distribution of these Sq(Y) components during solar quiet and active periods, exceptthat they are more intense in high solar activity. We found that the longitudinal variations in the SouthernHemisphere were primarily attributed to the differences in the annual component (Sq1), which is stronger atthe Eurasia and Australia anomaly zones than at the South Atlantic Ocean anomaly (SAA) zones. The positivecorrelation between Sq0 and geomagnetic vertical component Z suggests that the convection electric fields inthe dynamo region play a key role in controlling the annual mean (Sq0). On the other hand, the Sq1 exhibits apositive correlation with geomagnetic ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...