Imaging Coronal Emission Lines under High Sky-Background Conditions

Details Imaging Coronal Emission Lines under High Sky-Background Conditions Imaging Coronal Emission Lines under High Sky-Background Conditions

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996soph..166..311k&link_type=abstract

Solar Physics, Volume 166, Issue 2, pp.311-315

Physics

Scientific paper

We have obtained images in solar coronal emission lines under high sky-background conditions by making precise differential measurements between the coronal emission line and the near-by continuum, which is primarily due to scattered light from the solar disk. Chopping between the two wavelengths was performed at 100 kHz to avoid artifacts from fast-flying dust particles and other aerosols, and also from seeing effects. The differential signal was detected with a novel CCD camera that demodulates signals up to 100 kHz. These preliminary observations show coronal emission at the 0.2% level of the scattered-light background and pave the way to efficient and precise imaging of coronal emission features under less than ideal ‘coronal-sky’ conditions.

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