Quantitative imagery of photospheric oscillations

Details Quantitative imagery of photospheric oscillations Quantitative imagery of photospheric oscillations

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984crasb.298..735d&link_type=abstract

Academie des Sciences (Paris), Comptes Rendus, Serie II Mecanique, Physique, Chimie, Sciences de l'Univers, Sciences de la Terre

Astronomy and Astrophysics

Astronomy

2

Astronomical Photography, Photosphere, Solar Oscillations, Fourier Transformation, Power Spectra, Spatial Filtering

Scientific paper

A selective solar polarization filter (SSPF) permitted direct photography of the oscillations on the surface of the sun. The SSPF transmits the half-width of th 0.135 A to isolate the NaD1 spectral band. Material movements on the solar surface are then perceived in terms of intensity variations. An angular resolution of 1 arcsec is achieved at sites of about 450 km below the 5000 K temperature level of the photosphere. Sample images of oscillating cells from 4-22 thousand km across featuring material velocities of 220-1080 m/sec are provided. The oscillating modes are calculated to last 285 sec, within an error of 25 sec.

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