Stein, Robert F.

Contact Email: stein@pa.msu.edu
Institute: Physics and Astronomy Department,
Michigan State University
First Coauthor: David Bercik
Institute: Physics and Astronomy Department, Michigan State University
Second Coauthor: Aake Nordlund
Institute: Theoretical Astrophysics Center and Astronomical Observatory, NBIfAFG
Research URL:http://www.pa.msu.edu/~steinr/research.html
Presenting Thesis: Yes
Subject Area: The Sun
Waveband: Other (Please Specify Below)
Technique: Computational Astrophysics
Other: none
Presentation: Poster Display
Title: Formation and Evolution of Pores
Abstract: Pores form at the vertices of intergranular lanes, preferentially over vertices in the underlying mesogranular lanes. Typically they form when a small granule is squeezed out of existence and the surrounding magnetic field moves into its former location. The magnetic field in pores suppresses both vertical and horizontal fluid flows. This reduces the convective heat flux, which leads to cooling by radiation in the vertical direction while at the same time they are being heated by their surrounding hot walls. Because of their cooler temperature they become evacuated. Because of both the lower temperature and density the opacity is reduced and the optical depth unity layer is depressed by several hundred kilometers. Micropores typically form and disappear on a granulation time scale even though the underlying magnetic field configuration evolves on a much longer time scale. However, occasionally much longer lived pores form and live for many granulation time scales. <A HREF="http://www.pa.msu.edu/ steinr/research.html"> http://www.pa.msu.edu/ steinr/research.html</A>