Items where NERC Author is "Seppala, Annika"

van de Kamp, M.; Seppala, Annika; Clilverd, Mark A. ORCID: https://orcid.org/0000-0002-7388-1529; Rodger, Craig J.; Verronen, P.T.; Whittaker, I.C.. 2016 A model providing long-term data sets of energetic electron precipitation during geomagnetic storms. Journal of Geophysical Research - Atmospheres, 121 (20). 12520-12540. https://doi.org/10.1002/2015JD024212

Clilverd, M.A. ORCID: https://orcid.org/0000-0002-7388-1529; Rodger, C.J.; Andersson, M.E.; Seppala, A.; Verronen, P.T.. 2016 Linkages between the radiation belts, polar atmosphere and climate: Electron precipitation through wave particle interactions. In: Balasis, Georgios; Daglis, Ioannis A.; Mann, Ian R., (eds.) Waves, particles, and storms in geospace: a complex interplay. Oxford, Oxford University Press, 354-376.

Newnham, David A. ORCID: https://orcid.org/0000-0001-8422-1289; Espy, Patrick J.; Clilverd, Mark A. ORCID: https://orcid.org/0000-0002-7388-1529; Rodger, Craig J.; Seppala, Annika; Maxfield, David J.; Straub, Corinne; Holmén, Kim; Horne, Richard B. ORCID: https://orcid.org/0000-0002-0412-6407. 2013 Observations of nitric oxide in the Antarctic middle atmosphere during recurrent geomagnetic storms. Journal of Geophysical Research: Space Physics, 118 (12). 7874-7885. https://doi.org/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, 117 (A5), A05319. 14, pp. https://doi.org/10.1029/2011JA017363

Verronen, P.T.; Santee, M.L.; Manney, G.L.; Lehmann, R.; Salmi, S.-M.; Seppälä, A.. 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. https://doi.org/10.1029/2011JD016075

Newnham, David A. ORCID: https://orcid.org/0000-0001-8422-1289; Espy, Patrick J.; Clilverd, Mark A. ORCID: https://orcid.org/0000-0002-7388-1529; Rodger, Craig J.; Seppälä, Annika; Maxfield, David J.; Hartogh, Paul; Holmén, Kim; Horne, Richard B. ORCID: https://orcid.org/0000-0002-0412-6407. 2011 Direct observations of nitric oxide produced by energetic electron precipitation into the Antarctic middle atmosphere. Geophysical Research Letters, 38 (20), L20104. 5, pp. https://doi.org/10.1029/2011GL048666

Baumgaertner, A.J.G.; Seppala, Annika; Jockel, P.; Clilverd, Mark A. ORCID: https://orcid.org/0000-0002-7388-1529. 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. https://doi.org/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. https://doi.org/10.5194/acp-11-4645-2011

Clilverd, Mark A. ORCID: https://orcid.org/0000-0002-7388-1529; 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. https://doi.org/10.1029/2010JA015638

Rodger, Craig J.; Clilverd, Mark A. ORCID: https://orcid.org/0000-0002-7388-1529; 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. https://doi.org/10.1029/2010JA015599

Seppälä, A.; Randall, C.E.; Clilverd, Mark A. ORCID: https://orcid.org/0000-0002-7388-1529; Rozanov, E.; Rodger, C.J.. 2009 Geomagnetic activity and polar surface air temperature variability. Journal of Geophysical Research, 114 (A10), A10312. 10, pp. https://doi.org/10.1029/2008JA014029

Turunen, Esa; Verronen, Pekka T.; Seppälä, Annika; Rodger, Craig J.; Clilverd, Mark A. ORCID: https://orcid.org/0000-0002-7388-1529; 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. https://doi.org/10.1016/j.jastp.2008.07.005

Rodger, Craig J.; Clilverd, Mark A. ORCID: https://orcid.org/0000-0002-7388-1529; Thomson, Neil R.; Gamble, Rory J.; Seppala, Annika; Turunen, Esa; Meredith, Nigel P. ORCID: https://orcid.org/0000-0001-5032-3463; 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. https://doi.org/10.1029/2007JA012383