TAILIEUCHUNG - Simulation of long-term variations of the F2-layercritical frequency f0F2 at the northern tropical crest of ionization at Phu Thuy, Hanoi, Vietnam using the thermosphere-ionosphere-electrodynamicsgeneral circulation model (TIE-GCM)
In this work, the long-term variations of the simulated f0F2 by the NCAR thermosphere ionosphere-electrodynamics general circulation model (TIE-GCM) at the northern tropical crest of ionization at Phu Thuy, Hanoi, Vietnam (geographic latitudes and longitude: ) during the period from 1962 to 2002 are examined to evaluate the ability of this model to reproduce the major features of the f0F2 as observed. | Vietnam Journal of Earth Sciences 36 (2014) 470-479 Vietnam Academy of Science and Technology Vietnam Journal of Earth Sciences (VAST) Website: Simulation of long-term variations of the F2-layercritical frequency f0F2 at the northern tropical crest of ionization at Phu Thuy, Hanoi, Vietnam using the thermosphereionosphere-electrodynamics general circulation model (TIE-GCM) Pham Thi Thu Hong*1, C. Amory-Mazaudier2,3, Le Huy Minh1 1 Institute of Geophysics, Vietnam Academy of Science and Technology, Hanoi, Vietnam 2 Sorbonne Paris, UPMC University Paris VI, LPP, 4 place Jussieu 75252 Paris 3 T/ICT4D, ICTP, Strada Costiera 11, I - 34151 Trieste Italy Accepted 27 December 2014 ABSTRACT In this work, the long-term variations of the simulated f0F2 by the NCAR thermosphere ionosphere-electrodynamics general circulation model (TIE-GCM) at the northern tropical crest of ionization at Phu Thuy, Hanoi, Vietnam (geographic latitudes and longitude: ) during the period from 1962 to 2002 are examined to evaluate the ability of this model to reproduce the major features of the f0F2 as observed. The TIE-GCM simulates the influences of migrating and non-migrating diurnal and semidiurnal tides at the lower thermosphere, and changes of geomagnetic activity on the long-term variations of the f0F2. It reproduces well the diurnal and seasonal variations. We analyze the diurnal and seasonal variations of the observed f0F2 at Phu Thuy in approximately the same solar activity condition as in 1964, 1996 for the March and September equinoxes and June and December solstices. The local time and seasonal structures of these simulated results correspond well to those that are observed in 1964. On the contrary, the TIE-GCM does not reproduce the amplitude observed at Phu Thuy in 1996. The TIE-GCM with the chosen inputs does not yet allow us to explain well the long-term variations observed at Phu Thuy. We also try the different numerical
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