Solar induced variations of odd nitrogen: Multiple regression analysis of UARS HALOE data
AffiliationUniv Arizona, Lunar & Planetary Lab
MetadataShow full item record
PublisherAMER GEOPHYSICAL UNION
CitationSolar induced variations of odd nitrogen: Multiple regression analysis of UARS HALOE data 2006, 33 (22) Geophysical Research Letters
JournalGeophysical Research Letters
RightsCopyright 2006 by the American Geophysical Union.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at email@example.com.
AbstractA linear multiple regression statistical model is applied to estimate the solar induced component of odd nitrogen variability in the stratosphere and lower mesosphere using UARS HALOE data for 1991–2003. Consistent with earlier studies, evidence is obtained for a decadal NOx variation at the highest available latitudes (50° – 70°) that projects positively onto the solar cycle. This variation, which is most statistically significant in the Southern Hemisphere, also correlates positively with the auroral Ap index. It is therefore probably caused by downward transport during the polar night of thermospheric and mesospheric odd nitrogen. In addition, at low latitudes near and above the stratopause, evidence is obtained for an inverse solar cycle NOx variation. It is suggested that this low-latitude response may be caused primarily by increased photolysis of NO under solar maximum conditions. Throughout most of the rest of the stratosphere, no statistically significant response is obtained.
Note6 month embargo: Version of record online: 21 November 2006
VersionFinal published version
SponsorsThis material is based upon work supported by the National Science Foundation under grant ATM-0424840. Additional support from the NASA Living With a Star Research Program is also appreciated.