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Average Radial Structures of Gas Convection in the Solar Granulation by Oba, T.; Iida, Y.; Shimizu, T. is a Physics and Astronomy article available to read on EtoBox.

What is Average Radial Structures of Gas Convection in the Solar Granulation about?

Gas convection is observed in the solar photosphere as granulation, i.e., having highly time-dependent cellular patterns, consisting of numerous bright cells called granules and dark surrounding channels called intergranular lanes. Many efforts have been made to characterize the granulation, which may be used as an energy source for various types of dynamical phenomena. Although the horizontal gas flow dynamics in intergranular lanes may play a vital role, they are poorly understood. This is because the Doppler signals can be obtained only at the solar limb, where the signals are severely degraded by a foreshortening effect. To reduce such a degradation, we use Hinodeʼs spectroscopic data, which are free from a seeing-induced image degradation, and improve the image quality by correcting for stray light in the instruments. The data set continuously covers from the solar disk to the limb, providing a multidirectional line-of-sight (LOS) diagnosis against the granulation. The obtained LOS flow-field variation across the disk indicates a horizontal flow speed of 1.8-2.4 km s -1 . We also derive the spatial distribution of the horizontal flow speed, which is 1.6 km s -1 in granules and

Who reads Average Radial Structures of Gas Convection in the Solar Granulation?

Author

Oba, T.; Iida, Y.; Shimizu, T.

Publisher

University of Chicago Press; American Astronomical Society; Institute of Physics Publishing; IOP Publishing; Oxford University Press (OUP) (ISSN 0004-637X)

Published

2020

Language

EN

Field

Physics and Astronomy (Physical Sciences)