The coronal structure above sunspots and pores

Abstract

High-resolution X-ray observations of the solar corona have been used to study the structure above pores and small sunspots. We find that the lack of X-ray emission previously observed above large spot umbrae is also seen above pores. As is the case with large spots, the pores are surrounded by bright X-ray emitting structures. Using these data we argue that coronal heating requires magnetic field stressing from imposed motions internal to coronal flux bundles, rather than from displacement of the flux bundles. © 1993. The American Astronomical Society. All rights reserved.