Search Publications

The anomalous intensities of helium lines in the quiet solar transition region

Jordan, C.; MacPherson, K. P.

Previous studies using observations made at low spatial and spectral resolution showed that the resonance lines of Hei and Heii are anomalously strong in the quiet Sun when compared with other transition region lines formed at similar temperatures. Here, the higher spatial and spectral resolution provided by the Coronal Diagnostic Spectrometer (cd…

Depth of excitation and reversal of asymmetry of low-l solar P modes: a complementary analysis of BiSON^* and VIRGO/SPM† data

Chaplin, W. J.; Appourchaux, T.

We use the solutions to a simple, one-dimensional wave equation - which is intended to describe the essential elements of the solar resonant acoustic cavity - as formalistic models to which to fit low-l modes in observational helioseismic power spectra. We have analysed data collected in velocity, by the ground-based Birmingham Solar-Oscillations …