2.2.2 spase://SMWG/Instrument/Ground/MaunaLoaSO/ECHO MLSO_ECHO 2015-10-23T00:00:00Z The ECHO (Experiment for Coordinated Helioseismic Observations) is a network of two instruments which observe solar oscillations as seen in the radial velocity of the solar surface. The ECHO will use the next generation of the LOWL [Low degree(L)] instrument, which has been operated at the Mauna Loa Solar Observatory of the National Center for Atmospheric Research for the past several years. The first of the new ECHO instruments became operational on Dec 15, 1999 at the Observatorio del Teide, located at Izana, Tenerife, Spain. The LOWL instrument at MLSO was upgraded and became the second instrument in the ECHO network. The LOWL observes the oscillations as perturbations of the radial velocity over the surface of the Sun. This is accomplished by taking images in narrow bandpass filters displaced slightly redward and blueward of a solar absorption line. spase://SMWG/Person/Thomas.E.Holzer GeneralContact spase://SMWG/Instrument/MaunaLoaSO/ECHO Imager ECHO at MLSO spase://SMWG/Observatory/Ground/MaunaLoaSO