Monthly Archives: March 2014

9. HMI as “Coronagraph”?

Contributed by Juan-Carlos Martínez Oliveros. Posted on March 26, 2014

Reports of white-light ejecta above the limb of the Sun and imaged without the aid of a true coronagraph are exceedingly rare. Here we report the successful use of HMI to observe flare effects in the corona by the use of differencing as a substitute for an actual occulter.