EclipseMob (http://eng.umb.edu/~eclipsemob/) is a citizen science experiment that’s being organized in connection with the August 21 solar eclipse. NSF and the Geological Society of America are the sponsors.
EclipseMob is a crowdsourced effort to conduct the largest-ever low-frequency radio wave propagation experiment during an eclipse. The goal is to better understand the effect of sunlight on the ionosphere. You build a simple radio receiver and antenna (the kits are free to educators and non-profits) and collect the data before, during, and after the eclipse with your mobile phone or laptop — then upload them to EclipseMob.
You don’t have to be in the path of totality to participate. EclipseMob needs data from all over the United States, so they can study how signals traveling along different paths through the atmosphere are affected. The more observations, the better!