Title: 
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Search for solar g-modes using the limb data

Lead Investigator:
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Stuart Jefferies, National Solar Observatory

Team Members:
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Cliff Toner, National Solar Observatory		     

Local Coordinator:
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Rock Bush

Lead Programmer:
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Technical Summary:
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The objective is to detect solar g-modes.
The analysis is based on a differential measurement between
the signal in an annulus at the extreme limb edge and the signal
in an annulus with a slightly smaller radius. The limb signal
will be broken up into sectors to provide some spatial 
discrimination. 
        

Proposal Text:
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The solar g-mode signal is expected to be strongly concentrated
at the solar limb (T. Toutain, private communication). To enhance
the signal:noise ratio for g-mode detection, the effects of
the solar "background" signal will be reduced using a differential
measurement between concentric annulii at the limb (the g-mode signal
is expected to lie within 1/2 pixel).
Preliminary work using intensity data obtained at the geographic
South pole, indicate that the differential measurement produces
an l-nu spectrum that is much 'quieter' at the low-spatial 
frequencies than a spectrum produced from the signal in a single
annulus (We can produce high-quality l-nu spectra from a narrow
annulus at the limb). This work will compliment the reasearch
by J.Kuhn and colleagues who are modeling the limb signal
and looking at the spectra generated from the time-series
data of fit coefficients. 

See Also:
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