GONG Observations of Solar Surface Flows
| Autor: | J. C. Kasher, David H. Hathaway, J. A. Pintar, John Leibacher, G. W. Simon, Robert Howard, Frank Hill, Harrison P. Jones, Peter A. Gilman, J. W. Harvey |
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| Rok vydání: | 1996 |
| Předmět: |
Physics
Sunspot Multidisciplinary Meteorology Oscillation Geodesy Rotation Latitude Amplitude Physics::Space Physics Astrophysics::Solar and Stellar Astrophysics Solar rotation Differential rotation Astrophysics::Earth and Planetary Astrophysics Physics::Atmospheric and Oceanic Physics Convection cell |
| Zdroj: | Science. 272:1306-1309 |
| ISSN: | 1095-9203 0036-8075 |
| Popis: | Doppler velocity observations obtained by the Global Oscillation Network Group (GONG) instruments directly measure the nearly steady flows in the solar photosphere. The sun's differential rotation is accurately determined from single observations. The rotation profile with respect to latitude agrees well with previous measures, but it also shows a slight north-south asymmetry. Rotation profiles averaged over 27-day rotations of the sun reveal the torsional oscillation signal-weak, jetlike features, with amplitudes of 5 meters per second, that are associated with the sunspot latitude activity belts. A meridional circulation with a poleward flow of about 20 meters per second is also evident. Several characteristics of the surface flows suggest the presence of large convection cells. |
| Databáze: | OpenAIRE |
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