Stanford Helioseismology Archive, Stanford University
Data Center Description
The Stanford Helioseismology Archive provides data from the upgraded Global Oscillations Network Group.
Simultaneous intensity and line-of-sight velocity data of the full solar disk as measured at the two heights probed by the K (770 nm) and Na (589 nm) Fraunhofer lines. Three sets of uninterrupted observations at 10-seconds cadence were taken on 2003, January 1, 6 and 17, lasting 45, 107, and 68 hours, respectively.
Images in the red and blue wings of the lines were first corrected for dark and flat fields. Intensity images were then produced by adding toghether the red and blue wing intesities (red+blue). Line-of-sight velocity was cacluated according to (red-blue)/(red+blue).