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Cosmology Seminar: Brad Holden (UC Santa Cruz)
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Solar Physics Seminar: Peter Sturrock (Stanford)
| What | seminar |
|---|---|
| When |
19 May 08 from 04:00 pm to 05:00 pm |
| Where | Physics & Astrophysics Conf. Room 232 |
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Combined Analysis of Solar Neutrino and Solar Irradiance Data: Indications of an Inhomogeneous, Fluctuating, Slowly Rotating Core, and Suggestions of an Inner Tachocline, an Inner Dynamo, and a Second Solar Cycle
A search for any particular feature in any single solar
neutrino dataset is unlikely to establish variability of the solar
neutrino flux since the count rates are very low. It helps to combine
datasets, and in this talk I examine data from both the Homestake and
GALLEX experiments. These show evidence of modulation with a
frequency of 11.85 yr-1, which could be indicative of rotational
modulation originating in the solar core. I find that precisely the
same frequency is prominent in power spectrum analyses of the ACRIM
irradiance data for the Homestake and GALLEX time intervals. These
results suggest that the solar core is inhomogeneous and rotates with
sidereal frequency 12.85 yr-1. I find, by Monte Carlo calculations,
that the probability that the neutrino data would match the
irradiance data in this way by chance is only a few parts in 10,000.
This rotation rate is significantly lower than that of the inner
radiative zone (13.97 yr-1) as recently inferred from analysis of
Super-Kamiokande data, suggesting that there may be a second, inner
tachocline separating the core from the radiative zone. This opens up
the possibility that there may be an inner dynamo that could produce
a strong internal magnetic field and a second solar cycle. Analysis
of ACRIM data points to the existence of such a cycle with frequency
0.92 yr-1.
MASS: Doug Applegate