Eclipse observations of coronal forbidden lines emitted by highly ionized elements are unique as they extend the field of view of space-borne high-resolution EUV spectrometers and narrow-band EU Vimagers up to several solar radii. Furthermore, they combine in one single dataset the two main features of space-borne instrumentation:high spatial resolution 2D images of the solar corona and full temperature resolution and diagnostic potential allowed by monochromatic imaging of individual spectral lines. The limitation of the published eclipse results, however, has been the absence of an absolute calibration. In the present work, we combine the 2010 July 11 eclipse observations with simultaneous observations carried out with the Hinode/EIS instrument. Such a combination allows us to calibrate the eclipse images and to use them to carry out detailed plasma diagnostics in the extended corona out to a few solar radii using a variety of techniques.
|Published - 01 May 2012