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The Impact of Coronagraphs
St. Cyr, O. C.; Davila, J. M.; Fleck, B.
Given the grandeur of a total solar eclipse, it is likely that prehistoric humans marveled at the Sun's corona. Artificially rejecting light from the solar disk to see the million times fainter corona is a significant challenge, so it is not surprising that efforts to reproduce an eclipse were not successful until relatively recently.
The First Cluster and Double Star Symposium
Laakso, Harri; Goldstein, Melvyn; Masson, Arnaud +2 more
Cluster, a joint project between the European Space Agency (ESA) and NASA, is the first mission that is composed of four spacecraft flying in formation, and thus the first able to separate spatial and temporal features inside smallscale plasma structures within, and the boundaries between, many regions of the Earth's upper atmosphere (from 19,000-…