Oscillations with a period of 5.6 min were observed on 10 July, 1978 while tracking at 22 GHz the active region McMath 15403. The oscillations were strong, clearly defined, had no damping, and lasted for about two hours. The rarity of the phenomenon is indicated by the fact that it occurred only onc
The origin of the solar five-minute oscillation
โ Scribed by Steven Musman
- Publisher
- Springer
- Year
- 1974
- Tongue
- English
- Weight
- 334 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0038-0938
No coin nor oath required. For personal study only.
๐ SIMILAR VOLUMES
The acoustic overstability in a polytropic plane-parallel atmosphere with superadiabatic temperature gradient and radiative dissipation is demonstrated for optically thick disturbances. The periods of oscillation are found to be in the range 250-480 s and the associated wavelength of the order of 40
Equivalent widths of weak and moderately strong Fraunhofer lines observed in an area roughly 3500 โข 10000 km in extent are found to show small variations of the order of 1 mA, on a time scale of minutes. The dependence of amplitude on line strength and excitation closely fits that predicted for a co
The 5-min oscillations in the photospheric velocity fields have been studied in detail from measurements on 14 absorption lines from three time sequences of spectrograms of high quality. The lines cover a range of heights in the solar atmosphere from log z = + 0.2 to --1.2. Regions oscillating coher
A numerical simulation of observations of the spatial properties of the five-minute oscillations is carried out, assuming the oscillations are internal gravity waves excited by granular convection according to the theory of Thomas et al. (1971). The simulation includes the effects of seeing and fini