Computer Science
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mwoc.conf..323s&link_type=abstract
Multi-Wavelength Observations of Coronal Structure and Dynamics -- Yohkoh 10th Anniversary Meeting. Proceedings of the conferenc
Computer Science
2
Scientific paper
There is some evidence that the low-energy component of the solar neutrino flux exhibits rotational modulation. The power spectrum of the GALLEX-GNO neutrino data has a peak at 13.59 +/- 0.06 y-1 (period = 26.88 +/- 0.12 days), that is within the band of synodic rotation rates of the solar convection zone. In order to relate the neutrino time series to the Sun's internal rotation, we have formed a "resonance statistic" that is a measure of the degree of "resonance" of the neutrino flux with the Sun's internal rotation, as determined by MDI. A map of this statistic indicates that the source of the modulation of the solar neutrino flux is located deep in the convection zone. We have now carried out a comparative analysis of GALLEX-GNO neutrino data and SXT X-ray data. We have formed the logarithm of the mean daily X-ray flux (to de-emphasize active regions) and then formed the mean power spectrum for five 15-degree latitude bands centered on 30S, 15S, the equator, 15N, and 30N. The mean spectrum peaks at 13.54 +/- 0.08 y-1 (period = 26.98 +/- 0.16 days). Taking account of the error bars, the neutrino peak frequency and SXT peak frequency are indistinguishable. We find that the neutrino and X-ray waveforms are approximately in anti-phase. We have also formed a map of the resonance statistic formed from the SXT power spectrum and the MDI rotation estimates. The neutrino-rotation and X-ray-rotation resonance maps are very similar, and both point to the same location deep in the convection zone. These results suggest that modulation of the low-energy solar neutrino flux and long-lived quasi-rigid rotation of the corona have a common cause. It seems possible that a magnetic structure deep in the convection zone leads to (a) an enhancement of the X-ray flux, and (b) a diminution of the observed neutrino flux. This diminution could be caused by any one of several proposed mechanisms by which an electron neutrino, with non-zero magnetic moment and non-zero mass, may be converted into a neutrino of different flavor and/or opposite spin.
Sturrock Peter Andrew
Weber Mark A.
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