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During solar eclipses, the moon's shadow causes a large reduction in atmospheric energy input, including not only the stratosphere but also the thermosphere and ionosphere. The eclipse shadow has a supersonic motion which is theoretically expected to generate atmospheric bow-waves, similar to a fast-moving river boat, with waves starting in the lower atmosphere and propagating into the ionosphere.
On 21 August 2017, during daytime hours, a total solar eclipse with a narrow ?160 km wide umbral shadow occurred across the continental US. Totality was observed from the Oregon coast at ?9:15 LST (17:20 UT) to the South Carolina coast at ?13:27 LST (18:47 UT). A dense network of GNSS receivers was utilized to produce total electron content (TEC) and differential TEC.
Measurements from a dense network of GPS receivers have been used to clarify the relationship between substorm auroras and GPS signal corruption as manifested by loss-of-lock on the received signal. A network of nine receivers was deployed along roadways near the Poker Flat Research Range in central Alaska, with receiver spacing between 15 and 30 km.
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