Outside of an eclipse, the solar corona
is made invisible by the extremely bright light coming directly from the sun's visible surface - the photosphere.
However, as the solar corona
transitions into the solar wind, the ratio of the plasma pressure to the magnetic pressure changes, and the plasma pressure takes control.
Harkness for the first time obtained the spectrum of the solar corona
at the occasion of a solar eclipse in North America in 1869, and discovered an emission line emitted by the corona at a wavelength of 530.3 nm.
Caption: During a total solar eclipse in 2017, the moon will block the sun, allowing people to see the solar corona
(as seen in this picture from a 1999 eclipse observed In France).
With the advent of the Lyot coronograph in 1930, the study of the solar corona
outside of total eclipses became possible .
In the hypothesis that the solar corona
is in a state of self-organized criticality, the stressing of the magnetic field should be enhanced until a small perturbation switches on many small instabilities, happening together as it occurs in avalanches.
It continues EITs systematic CME watch program at an improved average cadence of 1 min to 2 min to better monitor events in the low solar corona
that might be relevant for space weather.
is a scientific mission to study the Sun, particularly physical processes that heat the solar corona
, accelerate the solar wind, and produce coronal mass ejections ( in picture).
The project will focus on the solar corona
, the outer atmosphere of the sun.
He is taking the lead for one particular project: 'Quantifying reconnection in the global solar corona
Richard Baum published his interesting historical account 'Mercury projected on the solar corona
', in the 2012 February Journal.
It was also observed in detail by NASA's STEREO satellites, actually showing the comet's tail wiggling wildly in transit through the solar corona