HAO Colloquium - Tzu-Wei Fang, CU CIRES

Quantifying the sources of ionospheric day-to-day variability 

Driving the Global Ionosphere Plasmasphere (GIP) model with the thermospheric parameters from the Whole Atmosphere Model (WAM), simulation results show significant longitudinal and day-to-day variations in the ionospheric parameters. To further quantify the contribution of lower atmosphere, solar and geomagnetic forcing to the ionospheric variability, three sets of simulations for June-July period are carried out. First, using the fixed solar and geomagnetic activity levels, the contributions of lower atmosphere tides to the longitudinal and day-to-day variability in the upper atmosphere are estimated. Secondly, apply the realistic day-to-day solar and geomagnetic inputs in the models to capture most of the variability in the ionosphere. Third, fixed the geomagnetic activities to quantify the contribution mainly from lower atmosphere and variations due to solar radiation. In this version of model, the TIROS/NOAA auroral precipitation patterns are included and the daily solar irradiance is derived from the SDO/EVE measurements. The standard deviations of the NmF2 and TEC at each local time from these runs are calculated and compared with observation. The sources of these variability and the amount of their contributions will be discussed. 


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Wednesday, October 11, 2017 - 1:30pm to 2:30pm