Densities and Velocities in Fast Coronal Mass Ejections: Radiative Pumping of the O VI Doublet

Details Densities and Velocities in Fast Coronal Mass Ejections: Radiative Pumping of the O VI Doublet Densities and Velocities in Fast Coronal Mass Ejections: Radiative Pumping of the O VI Doublet

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...606l.159r&link_type=abstract

The Astrophysical Journal, Volume 606, Issue 2, pp. L159-L162.

Astronomy and Astrophysics

Astronomy

11

Sun: Activity, Sun: Coronal Mass Ejections (Cmes)

Scientific paper

In very fast coronal mass ejections (CMEs), it is possible for O VI ions to scatter Lyβ photons that originate in the solar chromosphere and for the λ1037 transition of O VI to scatter λ1032 photons from the solar transition region. This scattering process can be identified by departures of the O VI I1032/I1037 intensity ratio from its collisional value of 2. We report the first detection of this effect in a CME that occurred on 2000 June 28, and we show that this pumping provides a density diagnostic for CMEs faster than 1600 km s-1. At heliocentric distances near 3 Rsolar, this diagnostic is useful for densities in the 5×105-107 cm-3 range.

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