The Work of the Diode Array: HE 10830 Observations of Spicules and Subflares.

摘要

At a spatial resolution of 1 sec and with spectral passbands of 0.25-0.47 A, the chromospheric fine structure was studied with an array of 512 silicon photodiodes. The high quantum efficiency of the diodes in the near infrared 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 revealed 1 sec points and elongated features that are interpreted as spicules seen against the disk. Active regions and filaments of 10830 are compared with H alpha and Ca II (8542 A) features. Filament contrast increases with the proximity of bright plage. Twelve subflares were studied and in eight cases, 3-5 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, contary 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, as seen with a resolution of 1-2 sec, broke down into a mosaic of both polarities with 3-5 sec diam. elements. (Author)