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.
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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.