VIRGO intercomparison:
Reduction of Noise for g mode Detection

Lead Investigator:	Thierry Appourchaux
Team Members:	T. Hoeksema & A. Kosovichev*
Local Coordinator:	T. Hoeksema
Lead Programmer:	TBD

Technical Summary:

This proposal should be part of the VIRGO intercomparison. The passage of sunspots from pixel to pixel on the LOI will induce low frequency noise that might prevent us to detect the g modes. Due to the low resolution capability of the LOI, the only way to 'see' sunspots moving across the LOI detector is to use the MDI data. The data needed will be the LOI proxy (LOI mask of the Structure Program), and the Continuum and Line Depth Averages (also of the Structure Program). These data will also be used to have a proper flat field of the LOI pixels.

Proposal Text:

At the time of writing, feasibility of such an approach is being done with the GONG data and the LOI Tenerife data. Up to now the main item of concern is the effect of sub-pixel guiding; this spurious effect is due to the pixelisation of the images. A proper integration of a given pixel needs to be implemented.

See Also:

GONG program 76: Detection of sunspot passage with the LOI and GONG data (for SOHO...)