Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa23a1133s&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SA23A-1133
Physics
0341 Middle Atmosphere: Constituent Transport And Chemistry (3334), 2427 Ionosphere/Atmosphere Interactions (0335), 2455 Particle Precipitation, 7974 Solar Effects
Scientific paper
In this study we combine odd nitrogen (NOx) observations from the satellite instruments with a radio wave ionisation index to provide a detailed description of the generation and descent of polar NOx into the upper stratosphere during the Northern Hemisphere winter of 2003-2004. The measurements are used to study the relative contributions of ionization due to solar proton events, energetic electron precipitation, and auroral precipitation on NOx production, and its subsequent downward transport to the upper stratosphere. We show that NOx generated from the large solar proton storm in October/November 2003 was transported into the upper stratosphere in agreement with model calculations, but that aurorally generated NOx also descended later in the winter. Both periods were highly significant and produced large long-lived decreases in stratospheric ozone. The observations made by GOMOS/Envisat deep into the nighttime polar vortex prove critical in differentiating between the stratospheric effects of these two events.
Clilverd Mark A.
Rodger Craig J.
Seppälä Annika
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