Further evidence of 15,000 KM cellular structure in the solar photosphere.

Abstract

view Abstract Citations References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Further evidence of 15,000 KM cellular structure in the solar photosphere. Stuart, F. E. ; Rush, J. H. Abstract In 1950 Richardson and Schwarzschild obtained a high quality spectrogram exhibiting small Doppler velocities in solar granules.1 They noted only a slight correlation between velocity and brightness for the small granules. Later, Frenkiel and Schwarzschild found in the turbulence spectrum calculated from these velocity data evidence of cells spaced approximately 15,000 km apart.2 From Richardson and Schwarzschild's published data we confirmed the existence of a weak positive correlation between ascending velocities and brightness (r = 0.3). We then applied a running-mean procedure to reduce the effects of large scale fluctuations, and obtained an improvement in the correlation (r = o.~) that can only be interpreted as evidence that the bright small granules are, in general, ascending. We also analyzed several excellent white-light photographs of the solar disk taken by W. A. Miller at R.C.A. Laboratories, Rocky Point, Long Island. Microdensitometer traces of these plates revealed a brightness structure with a mean spacing of 15,000 km. The r.m.s. deviation from the mean brightness averaged about I per cent of the mean brightness. It is tempting to identify these brightness fluctuations with Frenkiel and Schwarzschild's velocity fluctuations. This research was supported in part by the Radio Corporation of America. I.A~. J. ~~~, 351, 1950. 2.A~. J. ii6, 422, 1952. Department of Physics, University of Colorado, and High Altitude Observatory, Boulder, Colo. Publication: The Astronomical Journal Pub Date: December 1953 DOI: 10.1086/106872 Bibcode: 1953AJ.....58..231S full text sources ADS |