caa a22 4500 445346876 CHVBK 20180317142831.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1007/s11207-011-9747-0 doi (NATIONALLICENCE)springer-10.1007/s11207-011-9747-0 Ionospheric Day-to-Day Variability Around the Whole Heliosphere Interval in 2008 [Elektronische Daten] [Wenbin Wang, Jiuhou Lei, Alan Burns, Liying Qian, Stanley Solomon, Michael Wiltberger, Jiyao Xu] Ionospheric F2 peak electron densities (NmF2) measured at ten ionosonde stations have been analyzed to investigate ionospheric day-to-day variability around the Whole Heliosphere Interval (WHI) in 2008 (Day of Year (DOY) 50 - 140). The ionosonde data showed that there was significant global day-to-day variability in NmF2. This variability had 5-, 7-, 9-, 11-, 13.5-, and 16 - 21-day periodicities. At middle latitudes, the ionosphere appeared to respond directly to the solar-wind and interplanetary-magnetic-field (IMF) induced geomagnetic-activity forcing, with the day-to-day variability having the same periods as those in the solar-wind/IMF and geomagnetic activity. At the geomagnetic Equator, the ionosphere had a strong 7-day periodicity, corresponding to the same periodicity in the IMF B z component. In the equatorial anomaly region, the ionosphere showed more complicated day-to-day variability, dominated by the 9-day periodicity. In addition, there were also periodicities of 11 days and 16 - 21 days in the ionosonde data at some stations. The ionosonde data were compared with the Coupled Magnetosphere Ionosphere Thermosphere (CMIT) simulations that were driven by the observed solar-wind and IMF data during the WHI. The CMIT simulations showed similar ionospheric daily variability seen in the data. They captured the positive and negative responses of the ionosphere at middle latitudes during the first corotating interaction region (CIR) event in the WHI. The response of the model to the second CIR event, however, was relatively weak. Springer Science+Business Media B.V., 2011 Wang Wenbin High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO, USA aut Lei Jiuhou Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO, USA aut Burns Alan High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO, USA aut Qian Liying High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO, USA aut Solomon Stanley High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO, USA aut Wiltberger Michael High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO, USA aut Xu Jiyao Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing, China aut Solar Physics Springer Netherlands 274/1-2(2011-12-01), 457-472 0038-0938 274:1-2<457 2011 274 11207 https://doi.org/10.1007/s11207-011-9747-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11207-011-9747-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wang Wenbin High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO, USA aut NATIONALLICENCE 700 1- Lei Jiuhou Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO, USA aut NATIONALLICENCE 700 1- Burns Alan High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO, USA aut NATIONALLICENCE 700 1- Qian Liying High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO, USA aut NATIONALLICENCE 700 1- Solomon Stanley High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO, USA aut NATIONALLICENCE 700 1- Wiltberger Michael High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO, USA aut NATIONALLICENCE 700 1- Xu Jiyao Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing, China aut NATIONALLICENCE 773 0- Solar Physics Springer Netherlands 274/1-2(2011-12-01), 457-472 0038-0938 274:1-2<457 2011 274 11207 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer