A Study of Equatorial Coronal Holes during the Maximum Phase of Four Solar Cycles

Nishu Karna, Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, United States, Mahendra Lal Karna, Retired, Janakpur Dham, Nepal, Steven H. Saar, Smithsonian Astrophysical Observatory, Cambridge, MA, United States, William Dean Pesnell, NASA / GSFC, Greenbelt, MD, United States and Edward DeLuca, SAO, Cambridge, MA, United States