  The Sun Watcher with Active Pixels and Image Processing (SWAP) EUV solar
telescope on board the Project for On-Board Autonomy 2 (PROBA2) spacecraft has
been regularly observing the solar corona in a bandpass near 17.4 nm since
February 2010. With a field-of-view of 54x54 arcmin, SWAP provides the
widest-field images of the EUV corona available from the perspective of the
Earth. By carefully processing and combining multiple SWAP images it is
possible to produce low-noise composites that reveal the structure of the EUV
corona to relatively large heights. A particularly important step in this
processing was to remove instrumental stray light from the images by
determining and deconvolving SWAP's point spread function (PSF) from the
observations. In this paper we use the resulting images to conduct the first
ever study of the evolution of the large-scale structure of the corona observed
in the EUV over a three-year period that includes the complete rise phase of
solar cycle 24. Of particular note is the persistence over many solar rotations
of bright, diffuse features composed of open magnetic field that overlie polar
crown filaments and extend to large heights above the solar surface. These
features appear to be related to coronal fans, which have previously been
observed in white-light coronagraph images and, at low heights, in the EUV. We
also discuss the evolution of the corona at different heights above the solar
surface and the evolution of the corona over the course of the solar cycle by
hemisphere.
