Characteristic structures of the solar disc observed on rocket UV filtergrams

Details Characteristic structures of the solar disc observed on rocket UV filtergrams Characteristic structures of the solar disc observed on rocket UV filtergrams

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...136..133f&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 136, no. 1, July 1984, p. 133-141.

Astronomy and Astrophysics

Astrophysics

15

Filtergrams, Fourier Analysis, Solar Atmosphere, Spectroheliographs, Spectrum Analysis, Ultraviolet Filters, Autocorrelation, Energy Spectra, High Resolution, Image Processing, Power Spectra, Remote Sensing, Solar Granulation, Solar Oscillations, Solar Temperature, Statistical Analysis

Scientific paper

The high resolution ultraviolet filtergrams obtained with the Transition Region Camera (a 10 cm aperture telescope equipped with broad-band filters and a film cassette) have been statistically analyzed, using two different methods of Fourier filtering (the Optical and the Numerical Fourier Analysis) and autocorrelation of one-dimensional scans of network and active disk areas. The statistical properties and average dimensions of the structures characteristic of ultraviolet solar filtergrams near temperature minimum are deduced. The dimensions of the ultraviolet cell grains characteristic of the 160 nm pictures are found to be of the order of 0.6 Mm (i.e., 0.9 arcsec with an interdistance 1.4 Mm). The network and plage elements are brighter and broader (about 1.0 Mm). An intermediate scale of about 8 Mm is found in the cells which is discussed in terms of the velocity field associated with the 3 min chromospheric oscillations. A scale of about 14 Mm is found in plage areas, which is related to the structure of the network in active regions.

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