F-corona

F-corona

The outer part of the solar corona, responsible for the greater part of its intensity beyond a distance of about two solar radii. It consists of relatively slow-moving particles of interplanetary dust and exhibits an absorption spectrum because the particles scatter light from the photosphere. The F-corona extends for many million kilometers into the interplanetary medium and merges, in the plane of the ecliptic, with the particles that give rise to the zodiacal light.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
Mentioned in ?
References in periodicals archive ?
Can you observe the F-corona? What overall shape will the corona take during the August 21st eclipse?
I'm familiar with only two observers who have knowingly seen the F-corona extending along the ecliptic during a total eclipse.
The F-corona is characterized by the presence of Fraunhofer lines and, in the SSM, is believed to be produced by dust particles which act to scatter photospheric light without polarization [16, p.
*3 The idea that the F-corona was produced by interplanetary dust particles was initially adopted in accounting for the behavior of the corona, even within the context of the LMHSM [22-24].
This is the case in the outer corona, or F-corona, where photospheric light is being scattered by dust particles contained in the interplanetary medium [13, p.
Oddly, while the gaseous models invoke electron based scattering of Fraunhofer lines, causing them to disappear in the K-corona, scattering by dust particles preserves the lines of the F-corona. The situation is further complicated because the K-corona is in the same physical space as the E-corona, which is producing emission lines, including the coronal line at 5303.3 A [13-16].