Forcing of the ionosphere from above and below during the Arctic winter of 2005/2006 |
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| Authors: | Pl Mukhtarov B Andonov C Borries D Pancheva N Jakowski |
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| Institution: | 1. Geophysical Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Street bl.3, 1113 Sofia, Bulgaria;2. DLR, Institute of Communications and Navigation, Kalkhorstweg 53, 17235 Neustrelitz, Germany;1. Departamento de Física e Astronomia, Universidade do Vale do Paraíba (UNIVAP), São José dos Campos, São Paulo, Brazil;2. Departamento de Física, Universidade Federal de Goiás (UFG), Campus Jataí, Goiás, Brazil;3. Centro Universitário Luterano de Palmas, Palmas, Brazil;1. South Regional Center for Space Research, National Institute for Space Research (CRS-INPE) and Space Science Laboratory of the Federal University of Santa Maria (LACESM/CT-UFSM), Santa Maria, RS, Brazil;2. Federal University of Santa Maria (UFSM), Santa Maria, RS, Brazil;3. Instituto de Pesquisa e Desenvolvimento (IP&D), Universidade do Vale do Paraíba (UNIVAP), Sao Jose dos Campos, Brazil;4. Aeronomy Division, National Institute for Space Research (DAE-INPE), Sao Jose dos Campos, Brazil;5. Center for Space Physics, Boston University, Boston, MA, USA;1. Universidade Federal de Pernambuco, Recife, PE, Brazil;2. Universidade Federal de Campina Grande, Campina Grande, PB, Brazil;3. Universidade Estadual da Paraíba, PB, Brazil;4. Instituto Nacional de Pesquisas Espaciais, São José dos Campos, SP, Brazil;1. National Institute for Space Research (INPE), São José dos Campos, SP, Brazil;2. Los Andes University, Mérida, Venezuela;3. National Space Science Center, Chinese Academy of Science, Beijing, China;4. Southern Regional Space Research Center (CRS/INPE), Santa Maria, RS, Brazil;1. Physikalisch-Meteorologisches Observatorium Davos World Radiation Centre, Davos, Switzerland;2. Institute for Atmospheric and Climate Science, Swiss Federal Institute of Technology Zurich, Zurich, Switzerland |
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| Abstract: | The present paper focuses on planetary wave type responses of the thermosphere/ionosphere system to forcing from above and below during the Arctic winter of 2005/2006. The forcing from above is described by the sunspot numbers, the solar wind speed, the Bz-component of the IMF and the geomagnetic Kp-index, while the forcing from below, i.e. by upward propagating atmospheric waves, is represented by the SABER/TIMED temperatures. The observed global ionospheric zonally symmetric oscillations with periods of ～9, ～14 and ～24–27 days were approved to be of solar origin. The most persistent ～9-day oscillation is linked to a triad of solar coronal holes distributed roughly 120° apart in solar longitude. The ～18-day westward propagating wave with zonal wavenumber 1, observed in the ionospheric currents (detected by magnetometer data), and in the F-region plasma (foF2 and TEC) could be allocated to a simultaneous 18-day westward propagating planetary wave observed in the stratosphere/mesosphere/lower thermosphere region with large (～70 km) vertical wavelength. |
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