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Ionospheric Effects of the 2009 Sudden Stratospheric Warming

Ionospheric Effects of the 2009 Sudden Stratospheric Warming. M.V. Klimenko, V.V. Klimenko, Yu.N. Korenkov, F.S. Bessarab, I.V. Karpov, N.A. Korenkova (West Department of the Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation RAS, Kaliningrad,

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Ionospheric Effects of the 2009 Sudden Stratospheric Warming

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  1. Ionospheric Effects of the 2009 Sudden Stratospheric Warming M.V. Klimenko, V.V. Klimenko, Yu.N. Korenkov, F.S. Bessarab, I.V. Karpov, N.A. Korenkova (West Department of the Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation RAS, Kaliningrad, e-mail maksim.klimenko@mail.ru) K.G. Ratovsky, M.A. Chernigovskaya (Institute of Solar-Terrestrial Physics RAS, Irkutsk) A.E. Stepanov (Institute of Cosmophysical Research and Aeronomy, RAS, Yakutsk, Russia)

  2. INTRODUCTION • The PW can be observed in the ionosphere (Altadill et al., 2001; Pancheva et al., 2002; Danilov and Vanina, 2004). • Liu et al. (2010) demonstrated clearly that the quasi-stationary PWs present at the lower boundary at high latitudes modify the total electron content (TEC). • The low-latitude ionospheric variations during SSW periods can be found in Goncharenko et al. (2010a, b), and Chau et al. (2010, 2011).

  3. Observational Evidence of Ionospheric Response During SSW Goncharenko et al, 2010 Yue et al, 2010 afternoon morning

  4. Pancheva and Mukhtarov., 2011 Day Number (start 1 October 2007) Day Number (start 1 October 2008)

  5. Recent Model results Chau et al, JGR 2010 Fuller-Rowell et al., JGR 2011 Goncharenko et al, GRL 2010

  6. Model GSM TIP BriefDescription 2009 SSW Event GlobalSelf-consistentModeloftheThermosphere, IonosphereandProtonosphere(GSM TIP) wasdevelopedinWesternDepartmentof IZMIRAN. The model GSM TIP was described in details inNamgaladzeetal., 1988. Inthismodelthenumericaldecisionofthehydrodynamicsequationsformulticomponentgasmixture, consistingofneutral (O2, N2, O, H), andcharged (themolecularions O2+, NO+, atomicions O+, H+, andelectrons) particlesisrealized. Themodelisaddedbythenewblockofelectricfield calculation Klimenkoetal., 2006, 2007.

  7. Observation Data • Vertical profiles of the atmospheric temperatures were obtained using the Microwave Limb Sounder (MLS) installed on satellite Aura EOS (Schwartz et al., 2008). • The DPS-4 Digisondes in Yakutsk and Irkutsk (Reinisch et al., 1997) were used as a data source for peak electron density over these stations. All Digisonde ionogram data has been manually scaled using an interactive ionogram scaling software, SAO Explorer (Reinisch et al., 2004; Khmyrov et al., 2008). • The observational data above two Brazilian ionospheric stations in S.J. Campos (SJCA). • Digital Ionosonde in Kaliningrad, Russia

  8. SSW scenario for 2009 Deviations of stratospheric (31 km, red line), mesospheric(76 km, green dashed line), and thermospheric(96 km, blue dotted line)temperatures on January – February 2009 measured by the EOS Aura spacecraft. The modeled deviations of Tn at the altitudes of 80 and 96 km are shown by green andblueasterisks, accordingly. The neutral temperature disturbances at altitude of 80 km (lower boundary of GSM TIP model).

  9. The longitude-altitude neutral temperature disturbances calculated at latitude of 60º with use GSM TIP model.

  10. Quiet The calculated ionospheric response to a permanent disturbance at the lower boundary of the thermosphere The global foF2 Model deviations initiated by SSW event foF2 disturbances (bottom) in MHz and electron temperaturedisturbances in K at altitude 300 kmat 24:00 UT

  11. CONCLUSIONS • Specifying perturbation in neutral temperature and density at the lower boundary of the thermosphere during SSW events, one can reproduce the variation of the neutral temperature in MLT region above Irkutsk and changes in ionospheric parameters that are consistent with the observation data presented by Pancheva and Muhtarov (2011, JASTP) • Choosing the position of minima and maxima of temperature and density perturbation of the neutral gas at the lower boundary of the thermosphere when proposed SSW scenario is implemented, one can reproduce the disturbance in thermospheric and ionospheric parameters • The morning-noon SSW positive effects in the electron density at low latitudes which have recently been discussed by Goncharenko et al. (2010), Chau et al. (2011), Fejer et al. (2011) are absent in our results • In future we want to use a more realistic description of neutral atmosphere parameters at altitudes of the mesopause region (lower boundary of the GSM TIP model) in order to reproduce the observed positive ionospheric disturbances at low latitudes during stratospheric warming events

  12. New Scenario for 2009 SSW Event GSM TIP model TIME-GCM model Thermospheic output at 80 km ECMWFmodel for SSW 2009 event Output at 30 km

  13. ECMWF + TIME-GCM +GSM TIP Preliminary results ECMWF + TIME-GCM

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