Equatorial spread-F occurrence observed at two near equatorial stations in the Brazilian sector and its occurrence modulated by planetary waves

Details Equatorial spread-F occurrence observed at two near equatorial stations in the Brazilian sector and its occurrence modulated by planetary waves Equatorial spread-F occurrence observed at two near equatorial stations in the Brazilian sector and its occurrence modulated by planetary waves

Mar 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jastp..73..457b&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 73, Issue 4, p. 457-463.

Physics

Scientific paper

In this work, we present a study on the ionospheric Equatorial Spread-F (ESF) occurrence and morphologic features, based on measurements made during the period of October 2005 and January 2006 and May-July 2006 by digital ionosondes operating at two near magnetic equator locations, namely, Palmas (10.2°S, 48.2°W; dip lat. 5.5°S) and Manaus (3.1°S, 60.0°W; dip lat. 6.4°N), Brazil. The ionospheric height related parameter (h′F), the ionospheric density related parameter (foF2), and the dynamo-electric fields inferred from h′F time derivative (dh′F/dt) were analyzed with wavelets transform. The results exhibit periodic nature with wave-like signatures of 12-16 days. On the other hand, the electron density time variability (dNe/dt) was also analyzed using wavelets transform, and it presented planetary wave modulation with episodic nature. The ESF start time variability demonstrates to have a periodic signature of approximately 15 days with a good significance level, and it has a tendency to be anti-correlated with the pre-reversal enhancement time velocity (dh′F/dt), showing that larger vertical drift velocities (ionospheric uplift) may contribute to generate earlier ESF occurrence.

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