Physics – Space Physics
Scientific paper
2011-08-23
Physics
Space Physics
18 pages, 7 Figures submitted to Journal of Atmospheric and Solar-Terrestrial Physics on 13th May, 2011
Scientific paper
The horizontal component amplitudes observed by ground-based observatories of the INTERMAGNET network have been used to analyze the global pattern variance of the solar diurnal variations. Data from magnetic stations present gaps in records and consequently we explored them via a time-frequency gapped wavelet algorithm. After computing the gapped wavelet transform, we performed wavelet cross-correlation analysis which was useful to isolate the period of the spectral components of the geomagnetic field in each of the selected magnetic stations and to correlate them as function of scale (period) with the low latitude Vassouras Observatory, Rio de Janeiro, Brazil, which is under the South Atlantic Magnetic Anomaly (SAMA) influence and should be used as a reference for an under-construction Brazilian network of magnetic observatories. The results show that the records in magnetic stations have a latitudinal dependence affected by the season of year and by the level of solar activity. We have found a disparity on the latitudinal response at southern and northern hemispheres during solstice, which is expected due to the asymmetry of the Sq field. On the other hand, records from magnetic stations located at approximately the same latitude but at different longitudes presented peculiar dissimilarities. These results suggest that quiet day patterns and the physical processes involved in their formation still remain an important issue, far from being fully understood.
Domingues Margarete O.
Frick Peter
Klausner Virginia
Mendes Odim
Papa Andres R. R.
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