Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...248..232h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 248, no. 1, Aug. 1991, p. 232-236.
Astronomy and Astrophysics
Astrophysics
8
Line Spectra, Solar Granulation, Solar Spectra, Spectrum Analysis, Photosphere, Power Spectra, Solar Activity, Solar Magnetic Field, Spectral Resolution, Spectrograms
Scientific paper
Two spectra obtained with high spatial resolution in active and nonactive regions of the sun have been analyzed. The enhanced fluctuations at subgranular scales in active regions observed in the power spectra of intensity and velocity, provide evidence for the existence of small magnetic flux tubes. Using the brightest and darkest continuum, intensity as indicators for granulum-intergranulum, granular and intergranular line profiles have been determined. In Ca(+) active regions, the intergranular profiles are changed more than the granular profiles. Also the full width at half maximum of the intergranular line profiles is enhanced in the active region. These results have been obtained without any polarization equipment and suggest that the magnetic elements are predominantly located in the intergranular regions.
Hanslmeier Arnold
Mattig Wolfgang
Nesis Anastasios
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