Moon-based UV reflecting coronagraph

Details Moon-based UV reflecting coronagraph Moon-based UV reflecting coronagraph

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994adspr..14...43v&link_type=abstract

Advances in Space Research, vol. 14, no. 6, p. (6)43-(6)47

Astronomy and Astrophysics

Astronomy

Coronagraphs, Earth Limb, Lunar Bases, Lyman Alpha Radiation, Ultraviolet Reflection, Angular Resolution, Plasmas (Physics), Solar Physics, Spatial Resolution, Moon, Space, Utilization, Astronomy, Science Aspects, Ultraviolet, Sun, Equipment, Moon-Based Observations, Lyman-Alpha Radiation, Magnetic Properties, Structure, Atmosphere, Velocity, Wavelength, Telescope, Design, Coronas, Comparison

Scientific paper

UV observations of the solar disc, and above the limb, have evidenced a wide range of possible diagnostics, especially in the Lyman alpha line. On the disc, Lyman alpha traces the magnetic (sometimes unexpected) structuring of the top of the atmosphere; out from the limb, it allows measurement of radial velocities up to a few solar radii where most optical techniques fail. Other diagnostics include the kinematics of ejections (e.g. Coronal Mass Ejections (CMEs), but also small-scale rapidly evolving plasmoids). We propose a dual-channel reflecting coronagraph combining relatively-high angular resolution (0.2-0.4 inches) with large spatial (2.5 solar radii from Sun center) and temporal coverage. The advantages offered by a Moon-based instrument are discussed.

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