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Anomalously low solar extreme-ultraviolet irradiance and thermospheric density during solar minimum

Woods, Thomas N.; Didkovsky, Leonid V.; Solomon, Stanley C. +2 more

Solar activity during 2007-2009 was very low, and during this protracted solar minimum period, the terrestrial thermosphere was cooler and lower in density than expected. Measurements from instruments on the SOHO and TIMED spacecraft, and by suborbital rocket flights, indicate that solar extreme-ultraviolet irradiance levels were lower than they w…