Variability in the Mesosphere/Thermosphere/Ionosphere System During the Quiet Time of April 2002

Details Variability in the Mesosphere/Thermosphere/Ionosphere System During the Quiet Time of April 2002 Variability in the Mesosphere/Thermosphere/Ionosphere System During the Quiet Time of April 2002

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm32b1160g&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM32B-1160

Physics

2427 Ionosphere/Atmosphere Interactions (0335), 2443 Midlatitude Ionosphere

Scientific paper

We investigate the structure of the global mesosphere-thermosphere-ionosphere system using multi-instrument observations during the April 2002 period, with focus on geomagnetically quiet periods. Large variations in electron density were observed at midlatitudes by the array of incoherent scatter radars, ionosondes and GPS receivers. On April 16, 2002, electron density decreases to ~50-70% of the level observed on Apr 15, 2002. This depletion far exceeds commonly observed 10-20% quiet-time variations. At the same time, the observations from the array of MF and meteor radars show global presence of planetary wave disturbances, and a westward offset in the zonal wind of 15 m/s was noticed at locations coincident with the area of large variations in the electron density. We find that variations in ionospheric parameters have a strong relationship with neutral density, and show that an extensive area of depleted electron density as observed by GPS receivers, ISR radars and ionosondes is coincident with the area of large decrease in the column integrated O/N2 ratio measured by the GUVI instrument on board of TIMED satellite. Similar variations are also predicted by the TIMEGCM/ASPEN model in both O/N2 ratio and electron density, though the magnitude of the variations in the model is significantly smaller.

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