Day-to-Day Variability in the Post-Sunrise F-Layer at Millstone Hill During Three Month- Long ISR Campaigns

Details Day-to-Day Variability in the Post-Sunrise F-Layer at Millstone Hill During Three Month- Long ISR Campaigns Day-to-Day Variability in the Post-Sunrise F-Layer at Millstone Hill During Three Month- Long ISR Campaigns

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa24a..01d&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SA24A-01

Physics

2427 Ionosphere/Atmosphere Interactions (0335), 2431 Ionosphere/Magnetosphere Interactions (2736), 2435 Ionospheric Disturbances, 2443 Midlatitude Ionosphere

Scientific paper

Ionospheric data from the Millstone Hill Incoherent Scatter Radar (ISR) is available for three month-long periods: Oct 2002, Sep 2005, and Mar 2006. These special data bases, in which observations are taken every day for an extended time, are very important because they allow us to study day-to-day variability in the ionosphere. Previously, in David et al [2004], we have reported on the variability in the rate of plasma buildup after sunrise at Millstone Hill during the Oct 2002 study. We supported our analysis of the data with results from the Utah State University Time Dependent Ionospheric Model (TDIM), showing that day-to-day variation in the vertical drift is most likely responsible for the wide variation seen in the F-layer buildup in the hours following sunrise. We also stated that the vertical drifts could be the result either of an eastward electric field, or a horizontal neutral wind, and that it was not possible, from a study of the data, to determine which of these two sources of vertical drift was primarily responsible. Since that study was presented, two additional month-long data bases from the Millstone Hill ISR have become available. We find that these also show their own degree of variability in the rate of plasma buildup after sunrise; and, in the case of Sep 2005, of a magnitude comparable to that seen during the Oct 2002 campaign. We show that the post-sunrise variability encompasses several different types of weather, and that the attribution of any one of these types to specific drivers of the ionosphere is very challenging. In particular, the correlation of the rate of buildup with the vertical drifts is not so clearly defined as in the previous case. This highlights the importance of having available a variety of such extended-period data bases, spanning different seasons and solar cycles.

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