5 research outputs found
Dynamics of Coronal Bright Points as seen by Sun Watcher using Active Pixel System detector and Image Processing (SWAP), Atmospheric Imaging Assembly AIA), and Helioseismic and Magnetic Imager (HMI)
The \textit{Sun Watcher using Active Pixel system detector and Image
Processing}(SWAP) on board the \textit{PRoject for OnBoard Autonomy\todash 2}
(PROBA\todash 2) spacecraft provides images of the solar corona in EUV channel
centered at 174 \AA. These data, together with \textit{Atmospheric Imaging
Assembly} (AIA) and the \textit{Helioseismic and Magnetic Imager} (HMI) on
board \textit{Solar Dynamics Observatory} (SDO), are used to study the dynamics
of coronal bright points. The evolution of the magnetic polarities and
associated changes in morphology are studied using magnetograms and
multi-wavelength imaging. The morphology of the bright points seen in
low-resolution SWAP images and high-resolution AIA images show different
structures, whereas the intensity variations with time show similar trends in
both SWAP 174 and AIA 171 channels. We observe that bright points are seen in
EUV channels corresponding to a magnetic-flux of the order of Mx. We
find that there exists a good correlation between total emission from the
bright point in several UV\todash EUV channels and total unsigned photospheric
magnetic flux above certain thresholds. The bright points also show periodic
brightenings and we have attempted to find the oscillation periods in bright
points and their connection to magnetic flux changes. The observed periods are
generally long (10\todash 25 minutes) and there is an indication that the
intensity oscillations may be generated by repeated magnetic reconnection
Selling displaced people? A multiâmethod study of the public communication strategies of international refugee organisations
Since 2011, the world has faced a major increase in forced displacement (UNHCR, 2017). As a growing number of states implement restrictive refugee policies, public communication has become essential for refugee organizations (Dijkzeul & Moke, 2005). Therefore, we have examined three international refugee organizationsâ discursive strategies towards the Syrian crisis, and their production and social context. A critical discourse analysis of international press releases (N=122) and six semi-structured interviews with press and regional officers have shown that the observed organizations largely dehumanize displaced people and subordinate them to the âWestern selfâ and state interests. Displaced people hardly obtain their own voice. First, press releasesâ medium characteristics and the importance of media attention result in a depersonalising humanitarian discourse. Second, we found indications of a post-humanitarian discourse reproducing the humanitarian sectorâs âmarketizationâ. Third, the examined organizations use the political realist cross-issue persuasion strategy, displaying displaced people as resettlement objects