From a sequence of white-light photographs of solar granulation at the centre of the disk, obtained by Spectro-Stratoscope on May 17, 1975, two-dimensional spatial power spectra of photospheric intensity fluctuations were deduced. These show periodicities of ~1000 s, 250--450 s (5-min oscillation),
Spatial and temporal variations in the solar brightness
โ Scribed by M.F. Woodard; K.G. Libbrecht
- Book ID
- 110429514
- Publisher
- Springer
- Year
- 2003
- Tongue
- English
- Weight
- 136 KB
- Volume
- 212
- Category
- Article
- ISSN
- 0038-0938
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Observations of X-ray bright points (XBP) over a six-month interval in 1973 show significant variations in both the number density of XBP as a function of heliographic longitude and in the full Sun average number of XBP from one rotation to the next. The observed increases in XBP emergence are estim
## Abstract The Southern Oscillation is an important mode of operation of the atmosphere. Several indices of the Southern Oscillation have been recognized, but for many purposes an index that gives a continuous, homogeneous time series is required. Phase differences between various areas complicate