Propagation of gravity waves and spread F in the low-latitude ionosphere over Tucumán, Argentina, by continuous Doppler sounding: First results

Results of systematic analysis of propagation directions and horizontal velocities of gravity waves (GWs) and spread F structures in low‐latitude ionosphere (magnetic inclination ~27°) in Tucumán region, Argentina, are presented. Measurements were carried out by multipoint continuous Doppler system...

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Bibliographic Details
Published in:	Journal of geophysical research. Space physics Vol. 119; no. 8; pp. 6954 - 6965
Main Authors:	Chum, J., Bonomi, F. A. M., Fišer, J., Cabrera, M. A., Ezquer, R. G., Burešová, D., Laštovička, J., Baše, J., Hruška, F., Molina, M. G., Ise, J. E., Cangemi, J. I., Šindelářová, T.
Format:	Journal Article
Language:	English
Published:	Washington Blackwell Publishing Ltd 01-08-2014
Subjects:	Climatology Doppler effect Doppler sounding equatorial spread F Geophysics Gravitational waves Gravity Gravity waves Inclination Ionosphere Ionospheric propagation Latitude low-latitude ionosphere Night Optical observations Propagation Sounding Spectrograms Spread F Summer Wave propagation Weather Argentina Argentina, Tucuman
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Summary:	Results of systematic analysis of propagation directions and horizontal velocities of gravity waves (GWs) and spread F structures in low‐latitude ionosphere (magnetic inclination ~27°) in Tucumán region, Argentina, are presented. Measurements were carried out by multipoint continuous Doppler system during 1 year from December 2012 to November 2013. It was found that meridian propagation of GWs dominated and that southward propagation prevailed in the local summer. Oblique spread structures observed in Doppler shift spectrograms and associated with spread F propagated roughly eastward at velocities from ~70 to ~180 m/s and were observed at night from ~ September to ~ March. The velocities were computed for 182 events and the azimuths for 64 events. Continuous Doppler sounding makes it possible to analyze more events compared to optical observations often used for propagation studies since the measurements do not depend on weather. Key Points Propagation of spread F and gravity waves in the low‐latitude ionosphereOne year observation by multipoint continuous Doppler sounding systemDetermination of azimuths and horizontal velocities of propagation
Bibliography:	ArticleID:JGRA51242 istex:78E907FB66DC54F844A489FA76A4D2847F056E39 ark:/67375/WNG-WGV02MD9-C Czech National Foundation - No. P209/12/2440; No. 13-09778P ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	2169-9380 2169-9402
DOI:	10.1002/2014JA020184