The Evershed effect was first detected at this observatory in January 1909 . Solar data collected by the lab is the oldest continuous series of its kind in India.
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Afterwards, measurements of the spectral emission lines emitted in the ultraviolet wavelengths have shown a systematic red-shift . The Evershed effect is common to every spectral line formed at a temperature below 10 5 K; this fact would imply a constant downflow from the transition region towards the chromosphere.
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