Studies of discrete and broadband oscillations in the F-peak electron density over Arecibo

Details Studies of discrete and broadband oscillations in the F-peak electron density over Arecibo Studies of discrete and broadband oscillations in the F-peak electron density over Arecibo

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsa33a..07z&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA33A-07

Physics

2437 Ionospheric Dynamics, 2467 Plasma Temperature And Density

Scientific paper

We have revisited the electron plasma line technique for measuring the critical frequency of the F2 peak density over the Arecibo incoherent scatter radar. This technique was publicized by Ganguly, [JGR 1982] who found that measurements of foF2 be made at kHz accuracy, i.e. density changes to within 0.2 cm-3, and at time scales near one second. Using this unprecedented precision, they showed that short period fluctuations (near 5 mHz) were present in the foF2. We have used the same technique with dual beam capabilities of the Arecibo radar to simultaneously measure the F-peak density at two locations in the ionosphere separated in the North-South direction by approximately 160 km. These measurements reveal that the broad-band power profile of fluctuations in the peak density is highly correlated at the two locations, but with a lag of approximately 5.3 minutes, entailing a propagation velocity from North to South of 500 m/s. Additionally, we have found that similar, to Ganguly, [JGR 1982] that there are short period fluctuations present in the F2 peak data with discrete frequencies between 1-3 mHz, and yet shorter period fluctuations are present but at weaker power.

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