AGU's online Space Weather Journal ran a special "news article" highlighting the Boulder science community anniversaries of several key historical events in solar physics and space weather, including HAO's 75th.
Seventy-five years ago Walter Orr Roberts helped establish the High Altitude Observatory. A Harvard graduate student, at the time, Roberts and his doctoral adviser, astrophysicist Donald Menzel, founded a small solar observing station high on the Continental Divide in Climax, Colorado. Years later, HAO joined the National Center for Atmospheric Research in Boulder, CO.