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Additional supporting information may be found in the online version of this article.

FilenameFormatSizeDescription
2012gl054591fs01.pdfPDF document93KHourly average ionization rates for the January (top) and March (bottom) SPEs. The contour levels are 100, 200, 500, 1000, 2000, and 5000 cm−3s−1.
2012gl054591fs02.pdfPDF document82KChanges of trace gas mixing ratios (ppbv) relative to 22 January 2012, NOx (left) and HNO3 (right). Weighting by the cosine of latitude has been applied to account for the area represented by each data point. The dashed-dotted lines are the SPEs. White lines represent data gaps due to non-availability of a sufficient number of nominal mode measurements.
2012gl054591fs03.pdfPDF document82KChanges of trace gas mixing ratios (ppbv) relative to 6 March 2012, NOx (left) and HNO3 (right). Weighting by the cosine of latitude has been applied to account for the area represented by each data point. The dashed-dotted lines are the SPEs. White lines represent data gaps due to non-availability of a sufficient number of nominal mode measurements.
2012gl054591fs04.pdfPDF document70KZonal mean differences of post-SPE (2325 January 2012) minus pre-SPE (2122 January 2012) mixing ratios for N2O (left, units of ppbv) and HNO4 (right, units of pptv).
2012gl054591fs05.pdfPDF document37KZonal mean differences of post-SPE (78 March 2012) minus pre-SPE (5-6 March 2012) mixing ratios for HNO4 (pptv).
2012gl054591fs06.pdfPDF document47KTemporal development of CO (colour coded) and CH4 (white isopleths). Since vertical gradients of mixing ratio profiles of both species have opposite sign, parallel isolines hint at anti-correlation, supporting the hypothesis that small-scale changes are caused by transport or sampling rather than chemical processes. CO and CH4 have the same sink (reaction with OH) and should be correlated rather than anticorrelated if their changes were caused by chemical removal.
2012gl054591readme.pdfPDF document29KSupporting Information
54591readme.txtplain text document3KSupporting Information

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