  The photometry of eclipse white-light (W-L) images showing a moving blob is
interpreted for the first time together with observations from space with the
PRoject for On Board Autonomy (PROBA-2) mission (ESA). An off-limb event seen
with great details in W-L was analyzed with the SWAP imager (Sun Watcher using
Active pixel system detector and image Processing) working in the EUV near 174
A. It is an elongated plasma blob structure of 25 Mm diameter moving above the
E-limb with coronal loops under. Summed and co-aligned SWAP images are
evaluated using a 20 hours sequence, in addition to the July 11, 2010 eclipse
W-L images taken from several sites. The Atmospheric Imaging Assembly (AIA)
instruments on board the Solar Dynamical Observatory (SDO) recorded the event
suggesting a magnetic reconnection near a high neutral point; accordingly, we
also call it a magnetic plasmoid. The measured proper motion of the blob shows
a velocity up to 12 km s^-1. Electron densities of the isolated condensation
(cloud or blob or plasmoid) is photometrically evaluated. The typical value is
10^8 cm^-3 at r=1.7 R, superposed on a background corona of 10^7 cm^-3 density.
The mass of the cloud near its maximum brightness is found to be 1.6x10^13 gr
which is typically 0.6x10^-4 of the overall mass of the corona. From the
extrapolated magnetic field the cloud evolves inside a rather broad open region
but decelerates, after reaching its maximum brightness. The influence of such
small events for supplying material to the ubiquitous slow wind is noticed. A
precise evaluation of the EUV photometric data after accurately removing the
stray light, suggests an interpretation of the weak 174 A radiation of the
cloud as due to resonance scattering in the Fe IX/X lines.
