Automatic Recognition and Characterisation of Supergranular Cells from Photospheric Velocity Fields
| Autor: | Hugh Potts, Declan A. Diver |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Physics
Photosphere Source data business.industry Astronomy and Astrophysics Power law Quantitative Biology::Cell Behavior Computational physics symbols.namesake Optics Space and Planetary Science Noise tolerance symbols High spatial resolution Astrophysics::Solar and Stellar Astrophysics Supergranulation business Doppler effect Smoothing |
| Zdroj: | Solar Physics. 248:263-275 |
| ISSN: | 1573-093X 0038-0938 |
| DOI: | 10.1007/s11207-007-9068-5 |
| Popis: | We have developed an exceptionally noise-resistant method for accurate and automatic identification of supergranular cell boundaries from velocity measurements. Because of its high noise tolerance the algorithm can produce reliable cell patterns with only very small amounts of smoothing of the source data in comparison to conventional methods. In this paper we describe the method and test it with simulated data. We then apply it to the analysis of velocity fields derived from high-resolution continuum data from MDI (Michelson Doppler Imager) on SOHO. From this, we can identify with high spatial resolution certain basic properties of supergranulation cells, such as their characteristic sizes, the flow speeds within cells, and their dependence on cell areas. The effect of the noise and smoothing on the derived cell boundaries is investigated and quantified by using simulated data. We show in detail the evolution of supergranular cells over their lifetime, including observations of emerging, splitting, and coalescing cells. A key result of our analysis of cell internal velocities is that there is a simple linear relation between cell size and cell internal velocity, rather than the power law usually suggested. |
| Databáze: | OpenAIRE |
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