Intensity oscillations in Na(I) D1 and D2 linesThe central intensities of Na(I) D1 and D2 linear profiles at the sites of the chromospheric bright points in the interior of the supergranulation cells were derived from photographic spectra. The observation scheme sampled spectra simultaneously in seven lines at a repetition rate of 12 sec. It is shown that the Na(I) D1 and D2 lines exhibit a four minute periodicity in their intensity oscillations. It is seen that the period of intensity oscillations decreases outwardly from the photosphere to the corona. It is surmised that the spatial and temporal relationships between intensity and/or velocity in the photosphere and chromosphere may explain the physical mechanisms of the underlying oscillations.
Document ID
19960014211
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Kariyappa, R. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Pap, Judit M. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 17, 2013
Publication Date
June 1, 1995
Publication Information
Publication: ESA, Proceedings of 4th SOHO on Helioseismology. Volume 2: Posters