Computer Science
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984stin...8435245g&link_type=abstract
Presented at the SBPC Meeting, Sao Paulo, Brazil, 1984
Computer Science
Interplanetary Magnetic Fields, Periodic Variations, Polarity, Power Spectra, Solar Activity, Solar Cycles, Spectrum Analysis, Sunspots, Time
Scientific paper
The behavior of the interplanetary magnetic field (IMF) polarity was analyzed from data covering the years 1926 to 1982. The data refer to daily values of the IMF polarity, which is defined as being away or toward, according to the predominat direction of the magnetic field along the Archimedes Spiral. In order to find possible periodicities, the data were submitted to power spectrum analysis, both in their totality and also grouped in shorter time intervals. The results show that, although on a large temporal scale the IMF seems to have a structure composed of two approximately equal sectors with opposite polarities, this configuration is not unique. On the contrary, from a subdivision of the data in annual intervals, it is seen that epochs with quasi-symmetric bi-sectorial structures are followed, with recurrences of 1.5 to 3 years by epochs with less defined structures or even with quasi-symmetric four-sectors, thus explaining the apparent controversy concerning the basic features of the IMF-polarity structure.
Gonzalez Alicia L. C.
Gonzalez Walter D.
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