Our experiment relies on National Institute of Standards and Technology (NIST) radio station WWVB in Fort Collins, Colorado, which constantly transmits time synchronization information on a 60 kHz carrier frequency.  

NIST operates several radio stations that provide precise time and frequency reference signals.  The WWVB signal is mainly used to synchronize radio-controlled clocks and watches all over the United States to a very precise atomic clock.  In the EclipseMob experiment, we will observe how the WWVB signal strength changes in response to the ionospheric changes caused by the eclipse.  Click here for more information about WWVB.