New Mauna Loa coronagraph systems

Details New Mauna Loa coronagraph systems New Mauna Loa coronagraph systems

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apopt..20.1094f&link_type=abstract

Applied Optics, vol. 20, Mar. 15, 1981, p. 1094-1101.

Physics

Optics

72

Coronagraphs, Solar Activity Effects, Solar Corona, Solar Instruments, Solar Prominences, Bandpass Filters, Hawaii, Linear Arrays, Raster Scanning, Solar Cycles, Solar Maximum Mission, Spatial Resolution

Scientific paper

A new set of instruments, consisting of two coronagraph systems, has been installed and is operating at the Mauna Loa Observing Station, Hawaii. The instruments are the 23-cm objective Mark III K-coronameter (K-III) system, a photoelectric instrument used to observe the inner solar corona from 1.2 R0 to 2.2 R0 and the 12.5-cm objective Prominence Monitor system used for the detection of H-alpha limb activity. New features of the K-coronameter system include the use of achromatic wave plates for wide bandpass operation and linear diode array detectors. Raster scans of the coronal image are obtained in 1.5 min for a critical sampling scheme of 20-sec of arc resolution (10 x 10-sec of arc pixels) in the coronal pB image. This represents a 350 information gain factor for each detection channel when compared with the previous Mauna Loa K-coronameters.

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