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Items where NERC Author is "Seppala, Annika"

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Number of items: 11.

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Newnham, David A.; Espy, Patrick J.; Clilverd, Mark A.; Rodger, Craig J.; Seppala, Annika; Maxfield, David J.; Straub, Corinne; Holmén, Kim; Horne, Richard B.. 2013 Observations of nitric oxide in the Antarctic middle atmosphere during recurrent geomagnetic storms. Journal of Geophysical Research - Space Physics, 118 (12). 7874-7885. 10.1002/2013JA019056

Kokorowski, M.; Seppala, A.; Sample, J. G.; Holzworth, R. H.; McCarthy, M. P.; Bering, E. A.; Turunen, E.. 2012 Atmosphere-ionosphere conductivity enhancements during a hard solar energetic particle event. Journal of Geophysical Research (Space Physics), 117 (A5), A05319. 14, pp. 10.1029/2011JA017363

Newnham, David; Espy, Patrick J.; Clilverd, Mark; Rodger, Craig J.; Seppala, Annika; Maxfield, David; Hartogh, Paul; Holmen, Kim; Horne, Richard. 2011 Direct observations of nitric oxide produced by energetic electron precipitation into the Antarctic middle atmosphere. Geophysical Research Letters, 38 (L20104). 5, pp. 10.1029/2011GL048666

Baumgaertner, A.J.G.; Seppala, Annika; Jockel, P.; Clilverd, Mark A.. 2011 Geomagnetic activity related NOx enhancements and polar surface air temperature variability in a chemistry climate model: modulation of the NAM index. Atmospheric Chemistry and Physics, 11 (9). 4521-4531. 10.5194/acp-11-4521-2011

Salmi, S.-M.; Verronen, P.T.; Tholix, L.; Kyrola, E.; Backman, L.; Karpechko, A.Yu.; Seppala, Annika. 2011 Mesosphere-to-stratosphere descent of odd nitrogen in February-March 2009 after sudden stratospheric warming. Atmospheric Chemistry and Physics, 11 (10). 4645-4655. 10.5194/acp-11-4645-2011

Verronen, P.T.; Santee, M.L.; Manney, G.L.; Lehmann, R.; Salmi, S.-M.; Seppala, Annika. 2011 Nitric acid enhancements in the mesosphere during the January 2005 and December 2006 solar proton events. Journal of Geophysical Research, 116 (D17), D17301. 12, pp. 10.1029/2011JD016075

Clilverd, Mark A.; Rodger, Craig J.; Gamble, Rory J.; Ulich, Thomas; Raita, Tero; Seppälä, Annika; Green, Janet C.; Thomson, Neil R.; Sauvaud, Jean-André; Parrot, Michel. 2010 Ground-based estimates of outer radiation belt energetic electron precipitation fluxes into the atmosphere. Journal of Geophysical Research, 115 (A12), A12304. 11, pp. 10.1029/2010JA015638

Rodger, Craig J.; Clilverd, Mark A.; Seppälä, Annika; Thomson, Neil R.; Gamble, Rory J.; Parrot, Michel; Sauvaud, Jean-André; Ulich, Thomas. 2010 Radiation belt electron precipitation due to geomagnetic storms: Significance to middle atmosphere ozone chemistry. Journal of Geophysical Research, 115 (A11), A11320. 12, pp. 10.1029/2010JA015599

Seppälä, A.; Randall, C.E.; Clilverd, Mark A.; Rozanov, E.; Rodger, C.J.. 2009 Geomagnetic activity and polar surface air temperature variability. Journal of Geophysical Research, 114 (A10), A10312. 10, pp. 10.1029/2008JA014029

Turunen, Esa; Verronen, Pekka T.; Seppälä, Annika; Rodger, Craig J.; Clilverd, Mark A.; Tamminen, Johanna; Enell, Carl-Fredrik; Ulich, Thomas. 2009 Impact of different energies of precipitating particles on NOx generation in the middle and upper atmosphere during geomagnetic storms. Journal of Atmospheric and Solar-Terrestrial Physics, 71 (10-11). 1176-1189. 10.1016/j.jastp.2008.07.005

Rodger, Craig J.; Clilverd, Mark A.; Thomson, Neil R.; Gamble, Rory J.; Seppala, Annika; Turunen, Esa; Meredith, Nigel P.; Parrot, Michel; Sauvaud, Jean Andre; Berthelier, Jean-Jacques. 2007 Radiation belt electron precipitation into the atmosphere: Recovery from a geomagnetic storm. Journal of Geophysical Research, 112 (11), A11307. 12, pp. 10.1029/2007JA012383

This list was generated on Fri Nov 28 00:02:58 2014 GMT.