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The staff and alumni of the High Altitude Observatory were deeply saddened to hear of R. Grant Athay’s passing on June 10, 2015, in Provo, Utah.
Scott McIntosh details the Sun's seasonal weather patterns and demonstrates how understanding the formation, interaction and instability of the Sun's activity bands will considerably improve forecast capability in space weather and solar activity over a range of timescales.
Just as a hurricane drives rain, wind, and floods, the space weather arising from a solar eruption can come in different forms. First comes the light from a solar flare, disrupting high-frequency radio communications at the Earth more or less immediately (eight minutes after leaving the Sun).
Approximating a model’s “true” state by applying Kalman filtering to solar cycles, a technique first developed in the 1950s and 1960s to help Apollo 11 settle safely on the Moon.
Recent work on historical recurrent geomagnetic activity and the peculiarity of the recent solar-cycle minimum, was chosen by the editors of AGU journals for special highlight.
New observational work provides more information about the evolution of the Sun's interior and origins of its enigmatic 11(-ish) solar cycle. The research potentially opens the door to improved forecasting of decadal-scale solar variability.