Does the coupling of the semiannual oscillation with the quasi-biennial oscillation provide predictability of Antarctic sudden stratospheric warmings?

by V. J. Nordström, A. Seppälä
Published 2021-08-01

Evidence for energetic particle precipitation and quasi-biennial oscillation modulations of the Antarctic NO₂ springtime stratospheric column from OMI observations

by E. M. Gordon, A. Seppälä, J. Tamminen
Published 2020-06-01

Corrigendum to "Geomagnetic activity related NOx enhancements and polar surface air temperature variability in a chemistry climate model: modulation of the NAM index" published in...

by P. Jöckel, A. Seppälä, A. J. G. Baumgaertner, M. A. Clilverd
Published 2011-05-01

Geomagnetic activity related NO_x enhancements and polar surface air temperature variability in a chemistry climate model: modulation of the NAM index

by P. Jöckel, A. Seppälä, A. J. G. Baumgaertner, M. A. Clilverd
Published 2011-05-01

Observational evidence of energetic particle precipitation NO_<i>x</i> (EPP-NO_<i>x</i>) interaction with chlorine curbing Antarctic ozone loss

by E. M. Gordon, A. Seppälä, B. Funke, J. Tamminen, K. A. Walker
Published 2021-02-01

Simulation study for ground-based Ku-band microwave observations of ozone and hydroxyl in the polar middle atmosphere

by D. A. Newnham, M. A. Clilverd, M. Kosch, M. Kosch, A. Seppälä, P. T. Verronen
Published 2019-03-01

Variability of NO_x in the polar middle atmosphere from October 2003 to March 2004: vertical transport vs. local production by energetic particles

by M. Sinnhuber, B. Funke, T. von Clarmann, M. Lopez-Puertas, G. P. Stiller, A. Seppälä
Published 2014-07-01

Mesosphere-to-stratosphere descent of odd nitrogen in February–March 2009 after sudden stratospheric warming

by S.-M. Salmi, P. T. Verronen, L. Thölix, E. Kyrölä, L. Backman, A. Yu. Karpechko, A. Seppälä
Published 2011-05-01

Effects of D-region RF heating studied with the Sodankylä Ion Chemistry model

by C.-F. Enell, A. Kero, E. Turunen, Th. Ulich, P. T. Verronen, A. Seppälä, S. Marple, F. Honary, A. Senior
Published 2005-07-01

Case study of the mesospheric and lower thermospheric effects of solar X-ray flares: coupled ion-neutral modelling and comparison with EISCAT and riometer measurements

by C.-F. Enell, P. T. Verronen, M. J. Beharrell, J. P. Vierinen, A. Kero, A. Seppälä, F. Honary, T. Ulich, E. Turunen
Published 2008-08-01

Statistical response of middle atmosphere composition to solar proton events in WACCM-D simulations: the importance of lower ionospheric chemistry

by N. Kalakoski, P. T. Verronen, P. T. Verronen, A. Seppälä, M. E. Szeląg, M. E. Szeląg, A. Kero, D. R. Marsh, D. R. Marsh
Published 2020-07-01

Statistical response of middle atmosphere composition to solar proton events in WACCM-D simulations: the importance of lower ionospheric chemistry

by N. Kalakoski, P. T. Verronen, P. T. Verronen, A. Seppälä, M. E. Szeląg, M. E. Szeląg, A. Kero, D. R. Marsh, D. R. Marsh
Published 2020-07-01

Statistical response of middle atmosphere composition to solar proton events in WACCM-D simulations: the importance of lower ionospheric chemistry

by N. Kalakoski, P. T. Verronen, P. T. Verronen, A. Seppälä, M. E. Szeląg, M. E. Szeląg, A. Kero, D. R. Marsh, D. R. Marsh
Published 2020-07-01

Spatio-temporal observations of the tertiary ozone maximum

by V. F. Sofieva, E. Kyrölä, P. T. Verronen, A. Seppälä, J. Tamminen, D. R. Marsh, A. K. Smith, J.-L. Bertaux, A. Hauchecorne, F. Dalaudier, D. Fussen, F. Vanhellemont, O. Fanton d&apos;Andon, G. Barrot, M. Guirlet, T. Fehr, L. Saavedra
Published 2009-07-01

A 2003 stratospheric aerosol extinction and PSC climatology from GOMOS measurements on Envisat

by F. Vanhellemont, D. Fussen, C. Bingen, E. Kyrölä, J. Tamminen, V. Sofieva, S. Hassinen, P. Verronen, A. Seppälä, J. L. Bertaux, A. Hauchecorne, F. Dalaudier, O. Fanton d'Andon, G. Barrot, A. Mangin, B. Theodore, M. Guirlet, J. B. Renard, R. Fraisse, P. Snoeij, R. Koopman, L. Saavedra
Published 2005-01-01

HEPPA-II model–measurement intercomparison project: EPP indirect effects during the dynamically perturbed NH winter 2008&ndash;2009

by B. Funke, W. Ball, S. Bender, A. Gardini, V. L. Harvey, A. Lambert, M. López-Puertas, D. R. Marsh, K. Meraner, H. Nieder, S.-M. Päivärinta, K. Pérot, C. E. Randall, T. Reddmann, E. Rozanov, H. Schmidt, A. Seppälä, M. Sinnhuber, T. Sukhodolov, G. P. Stiller, N. D. Tsvetkova, P. T. Verronen, S. Versick, T. von Clarmann, K. A. Walker, V. Yushkov
Published 2017-03-01

Solar forcing for CMIP6 (v3.2)

by K. Matthes, K. Matthes, B. Funke, M. E. Andersson, L. Barnard, J. Beer, P. Charbonneau, M. A. Clilverd, T. Dudok de Wit, M. Haberreiter, A. Hendry, C. H. Jackman, M. Kretzschmar, T. Kruschke, M. Kunze, U. Langematz, D. R. Marsh, A. C. Maycock, S. Misios, C. J. Rodger, A. A. Scaife, A. Seppälä, M. Shangguan, M. Sinnhuber, K. Tourpali, I. Usoskin, M. van de Kamp, P. T. Verronen, S. Versick
Published 2017-06-01