Other
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh32a0722m&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SH32A-0722
Other
7511 Coronal Holes
Scientific paper
We use the observations of the green corona low brightness regions to construct a time series of polar coronal hole area from 1939 to 1996, covering 5 solar cycles. We then perform a power spectral analysis of the monthly data time series. Several persistent significant periodicities appear in the spectra, they are related with those found in solar magnetic flux emergence, geomagnetic storm sudden commencements and cosmic ray flux at Earth. Of particular importance is the peak around 1.6-1.8 yr that was recently found in cosmic ray intensity fluctuations, and the peak at around 1 yr, also identified in coronal hole magnetic flux variations. Additional interesting features are the peaks close to 5 yr, 3 yr and the possible peak at around 30 yr that were also found in other solar and interplanetary phenomena. Our results stress the physical connection between the solar magnetic flux emergence and the interplanetary medium dynamics, in particular the
Lara Alejandro
Maravilla Dolores
Mendoza Blanca
Valdes-Galicia J.
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