Modulation of equatorial electrojet irregularities by atmospheric gravity waves

Autor(es)

Shume, E. B. ^[1] ; Rodrigues, F. S. ^[2] ; Mannucci, A. J. ^[1] ; de Paula, E. R. ^[3]

Afiliação do(s) autor(es)

^[1] CALTECH, Jet Prop Lab, Pasadena, CA 91125 - USA

^[2] Univ Texas Dallas, WB Hanson Ctr Space Sci, Dallas, TX 75230 - USA

^[3] Natl Inst Space Res, Sao Jose Dos Campos - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS; v. 119, n. 1, p. 366-374, JAN 2014.
• Citações Web of Science: 6

Resumo

On 9 January 2002 and 14 November 2001, the SAo Luis 30 MHz coherent backscatter radar observed unusual daytime echoes scattered from the equatorial electrojet. The electrojet echoing layers on these days, as seen in the range time intensity maps, exhibited quasiperiodic oscillations. Time-frequency decomposition of the magnetic field perturbations H, measured simultaneously by the ground-based magnetometers, also showed evidence of short-period waves. The ground-based observations were aided by measurements of the brightness temperature in the water vapor and infrared bands made by the GOES 8 satellite. The GOES 8 satellite measurements indicated evidence of deep tropospheric convection activities, which are favorable for the launch of atmospheric gravity waves (AGW) near SAo Luis. Our multitechnique investigation, combined with an analysis of the equatorial electric field and current density, indicates that AGW forcing could have been responsible, via coupling with E region electric fields, for the short-period electrojet oscillations observed over SAo Luis. Key Points <list list-type={''}bulleted{''}> <list-item id={''}jgra50807-li-0001{''}>Quasi-periodic oscillation of equatorial electrojet waves <list-item id={''}jgra50807-li-0002{''}>Ionosphere-atmosphere coupling <list-item id={''}jgra50807-li-0003{''}>Modulation of electrojet waves by gravity waves (AU)

• Processo FAPESP: 04/01065-0 - Imageamento das irregularidades ionosféricas por radar VHF
• Beneficiário: Eurico Rodrigues de Paula
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 07/08185-9 - Investigação das irregularidades do plasma do eletrojato equatorial e do eco de 150 km no setor brasileiro utilizando multi-instrumentos e modelagem
• Beneficiário: Esayas Belay Shume
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 99/00026-0 - Estudos das irregularidades ionosféricas utilizando radar HF/VHF/ de espalhamento coerente
• Beneficiário: Eurico Rodrigues de Paula
• Modalidade de apoio: Auxílio à Pesquisa - Regular