Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.1102s&link_type=abstract
American Astronomical Society, SPD meeting #40, #11.02; Bulletin of the American Astronomical Society, Vol. 41, p.825
Astronomy and Astrophysics
Astronomy
Scientific paper
We examine the magnetic evolution of the last three solar cycles (21-23) by using over 400 synoptic magnetic charts constructed by the National Solar Observatory (NSO). We find that flux levels and the spatial distribution of the strong field (>50 G) during cycle 23 are similar to those of the previous two cycles in the northern hemisphere, while the southern hemisphere behaves differently and appears responsible for the extended solar minimum. With hindsight, we could have predicted this anomalous behavior at least three years ago. Similar analysis of magnetic synoptic charts from the SOHO Michelson Doppler Imager (MDI) provides a cross-check on the cycle 23 NSO results; moreover, the MDI synoptic charts made from continuum data taken near the magneto-sensitive Ni I 6768 A spectral absorption line show sunspots, allowing us to contrast and compare the cycle as shown by the strong-field magnetic flux with that seen from measured sunspot area and computed sunspot number. The cycles look distinctly different.
Saba Julia L. R.
Strong Keith Temple
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