Helioseismology
The greater the depth, the greater the speed of sound and thus the wavelength.
The Helioseismology ( Greek Helio for sun and Seismology for Seismology) is a scientific branch of solar astrophysics , while a multidisciplinary field of research that the natural vibration analyzes of the sun and learned from them about their inner structure wins.
The American physicist Robert B. Leighton had observed a rhythmic movement with a period of about five minutes since 1960 and recognized that it was an oscillation of the sun's surface. He published his findings in 1961 and thus founded helioseismology as a new branch of astronomy .
The basic period of the sun's natural oscillation of around five minutes could be determined quite precisely using various earth-based observations and space probes such as SOHO .
The analysis of the observation or vibration data allows precise conclusions to be drawn about various physical parameters of the sun, e.g. B. on the speed of propagation of sound inside the sun. At the same time, the analysis enables the distribution of temperature and magnetic fields under the surface of the sun to be depicted.
According to recent findings, the self-oscillation is also for the 1,877 discovered supersonic plasma responsible jets on the sun's surface. As a rule, the sound waves inside the sun are slowed down. Occasionally, however, these waves can also reach the surface and cause material to be ejected. The plasma is thrown up to 5000 km at a speed of up to 80,000 km / h.
See also
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- ↑ Stars and Space (SuW), vol. 43 (2004), issue 8, p. 22, ( ISSN 0039-1263 )