What is ihy?

IHY can refer to different things depending on the context, but one of the notable references is to the International Heliophysical Year (IHY). It was an international scientific endeavor that took place in 2007-2008 to promote global cooperation in the study of heliophysics and to better understand the physical processes of the Sun and its interaction with the Earth and the solar system. It marked the 50th anniversary of the International Geophysical Year (IGY) of 1957 and included activities such as coordinated observation campaigns, educational outreach, and fostering international partnerships. If you meant something else by "ihy," please provide more context or clarification, and I'll be glad to help!