| Session Details | |
| Section | ST - Solar & Terrestrial Sciences |
| Session Title | Ionospheric Response to Extreme Terrestrial and Space Weather Events Including Geomagnetic Storms not Caused by CMEs |
| Main Convener | Prof. Sushil Kumar (The University of the South Pacific, Fiji) |
| Co-convener(s) | Prof. Duggirala Pallamraju (Physical Research Laboratory, India) Dr. Mario Bisi (Science & Technology Facilities Council, United Kingdom) Mr. David Webb (Boston College, United States) Prof. Yihua Yan (National Astronomical Observatories - Chinese Academy of Sciences, China) |
| Session Description | Under the extreme terrestrial weather conditions the average climatic conditions are seriously deviated. Among the severe terrestrial weather events, of particular interest, are tropical cyclones which are the most devastating weather systems affecting Asia, Oceania and the world. Space weather events such as geomagnetic storms and solar flares have significant impact on increasingly sophisticated ground- and space-based technological systems. In addition, Geomagnetic Storms not caused by CMEs are still important space-weather events. Both extreme terrestrial and space weather events (and those less extreme) can seriously affect the sub- and trans-ionospheric communications and other highly relied upon technologies. The atmospheric gravity waves (AGWs) that manifest themselves as traveling ionospheric disturbances (TIDs) may be associated with extreme terrestrial and space weather events and can seriously affect the ionosphere. The changes in the ionosphere, particularly under severe space weather conditions, seriously affect the performance of the global positioning system (GPS) and other global navigation satellite systems (GNSS). During the current solar cycle (Cycle 24), much of the space weather at Earth has resulted from the solar wind itself, particularly from equatorial high-speed streams, their interactions with the slow solar wind, and also their interactions and channelling of CMEs. This session solicits abstracts on space-weather effects, particularly geomagnetic storms at Earth, that are not caused by CMEs. In addition, abstracts covering space-weather effects recorded on other solar-system bodies not due to CMEs are also welcomed. The work may cover the implications for Cycles 24 and 25, implications for modelling efforts, outcomes from data and models presently available, and additional/future observations/measurements requirements. We also solicit contributions on experimental observations, empirical and theoretical modelling studies, and forecasting efforts, concerning terrestrial and space weather events impact on the lower ionosphere (D-region) and the upper ionosphere (F-region) using various ionospheric measurement techniques (radio wave, optical, in-situ); such as Ionosonde, GNSS/GPS, VLF and LF radio waves, remote sensing and radio occultation operations, airglow, interferometers, probes and detectors. Papers dealing with monitoring and the characterization of ionospheric scintillation and irregularities and their influences on GNSS signals, GPS meteorology missions such as COSMIC, AGWs/TIDs generation/propagation and ionosphere, and relevant topics, are also welcome. |