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Atomic Hydrogen Abundance During the Declining Phase of Solar Cycle 23

Martin Kaufmann(1), Catrin Lehmann(1) and Martin Riese(1)

(1) Forschungszentrum Juelich, Leo-Brandt-Str., 52425 Juelich, Germany

Abstract

We present global measurements of atomic hydrogen abundance as derived from SCIAMACHY airglow and GOMOS ozone measurements. These observations extend about 30S-70N in latitude and 85-95 km in altitude. The time-span of the dataset (2002-2009) covers the declining phase of the 23rd solar cycle. During this period, atomic hydrogen densities increase by 10-30%, depending on latitude, whereas ozone abundance as well as chemical heating rates show an opposite trend.