The work of the diode array - He 10830 observations of spicules and subflares

Details The work of the diode array - He 10830 observations of spicules and subflares The work of the diode array - He 10830 observations of spicules and subflares

Jul 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...43..129r&link_type=abstract

Solar Physics, vol. 43, July 1975, p. 129-145.

Physics

16

Chromosphere, Fine Structure, Helium, Photodiodes, Solar Flares, Spicules, Line Spectra, Near Infrared Radiation, Silicon Junctions, Solar Spectra

Scientific paper

At a spatial resolution of 1 sec and with spectral passbands of 0.25 to 0.47 A, the chromospheric fine structure was studied with an array of 512 silicon photodiodes. The high quantum efficiency of the diodes in the near-IR allowed low-noise spectroheliograms to be constructed from observations in the lines of H I, Ca II, and He I. Magnetograms of the underlying photosphere were obtained simultaneously. Tachograms in the He 10830-A line revelead 1-sec points and elongated features that are interpreted as spicules seen against the disk. Active regions and filaments at 10830 are compared with H-alpha and Ca II (8542 A) features. Twelve subflares were studied, and in eight cases, 3 to 5-sec kernels of He I emission appeared over small growing pores or over 5-sec patches of magnetic field emerging through the photosphere. All the subflares showed 10830 emission, contrary to established belief that the 10830 line goes into emission only in the largest flares. All the subflares included at least one emission kernel over regions where the photospheric magnetic field broke down into a mosaic of both polarities with elements 3 to 5 sec in diameter.

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