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Spectroscopy

Spectroscopy of quiet-Sun regions may be one solution to the problems mentioned above. Although spectroscopy requires a scan across an area to make an image, this can be neglected by using a sit and stare study, and provides information at a range of heights throughout the chromosphere. There is also the possibility of confirming the presence of waves via the Doppler shift of the line profile. It is also well known that many oscillations are stronger in a study of the Doppler shift, rather than the intensity of the line. Ideally a combined spectroscopic and imaging campaign, with high resolution magnetograms, and involving support from CDS and TRACE would provide a definitive dataset. With the onset of solar minimum over the next few years it will be easier to select in advance a quiet target region, far from active regions.



James McAteer 2004-01-14