Invisibility of Solar Active Region Umbra-to-Umbra Coronal Loops: New Evidence that Magnetoconvection Drives Solar-Stellar Coronal Heating

Sanjiv K Tiwari1,2, Julia K Thalmann3, Navdeep Kaur Panesar4, Ron L Moore4,5 and Amy R Winebarger4, (1)Lockheed Martin Solar and Astrophysics Laboratory, Palo Alto, CA, United States, (2)Bay Area Environmental Research Institute Palo Alto, Palo Alto, CA, United States, (3)Institute for Physics/IGAM, University of Graz, Graz, Austria, (4)NASA Marshall Space Flight Center, Huntsville, AL, United States, (5)Center for Space Plasma and Aeronomic Research, Huntsville, AL, United States