From the analysis of simultaneous Kitt Peak Ca ii Kline spectroheliograms and photospheric magnetic area scans, Sivaraman et al. (2000) showed the association of internetwork K2V bright points with magnetic features, con ﬁrming the earlier results of Sivaraman & Livingston (1982).
The relationship between chromospheric emissions and magnetic field strength
VAULT is speciﬁcally designed to obtain high spectral purity, zero dispersion spectroheliograms in the Lyman-α (1216 ˚A) resonance line of hydrogen.
The Structure and Dynamics of the Upper Chromosphere and Lower Transition Region as Revealed by the Subarcsecond VAULT Observations
The authors investigated spectroheliograms of active region fan loops produced from Fe viii and Si vii lines.
Off-limb (spicule) DEM distribution from SoHO/SUMER observations