Day-to-day variability of equatorial electrojet and its role on the day-to-day characteristics of the equatorial ionization anomaly over the Indian and Brazilian sectors

Autor(es)

Venkatesh, K. ^[1] ; Fagundes, P. R. ^[1] ; Prasad, D. S. V. V. . D. ^[2] ; Denardini, C. M. ^[3] ; de Abreu, A. J. ^[4] ; de Jesus, R. ^{[3, 1]} ; Gende, M. ^[5]

Afiliação do(s) autor(es)

^[1] Univ Vale Paraiba, IP&D, Sao Jose Dos Campos - Brazil

^[2] Andhra Univ, Dept Phys, Visakhapatnam, Andhra Pradesh - India

^[3] Inst Nacl Pesquisas Espaciais, Sao Jose Dos Campos - Brazil

^[4] ITA, Div Ciencias Fundamentais, Sao Jose Dos Campos, SP - Brazil

^[5] Univ Nacl La Plata, Fac Ciencias Astron & Geofis, La Plata, Buenos Aires - Argentina

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS; v. 120, n. 10, p. 9117-9131, OCT 2015.
• Citações Web of Science: 20

Resumo

The equatorial electrojet (EEJ) is a narrow band of current flowing eastward at the ionospheric E region altitudes along the dayside dip equator. Mutually perpendicular electric and magnetic fields over the equator results in the formation of equatorial ionization anomaly (EIA), which in turn generates large electron density variabilities. Simultaneous study on the characteristics of EEJ and EIA is necessary to understand the role of EEJ on the EIA variabilities. This is helpful for the improved estimation of total electron content (TEC) and range delays required for satellite-based communication and navigation applications. Present study reports simultaneous variations of EEJ and GPS-TEC over Indian and Brazilian sectors to understand the role of EEJ on the day-to-day characteristics of the EIA. Magnetometer measurements during the low solar activity year 2004 are used to derive the EEJ values over the two different sectors. The characteristics of EIA are studied using two different chains of GPS receivers along the common meridian of 77 degrees E (India) and 45 degrees W (Brazil). The diurnal, seasonal, and day-to-day variations of EEJ and TEC are described simultaneously. Variations of EIA during different seasons are presented along with the variations of the EEJ in the two hemispheres. The role of EEJ variations on the characteristic features of the EIA such as the strength and temporal extent of the EIA crest has also been reported. Further, the time delay between the occurrences of the day maximum EEJ and the well-developed EIA is studied and corresponding results are presented in this paper. (AU)

• Processo FAPESP: 12/08445-9 - Estudo da variabilidade dia-a-dia da mesosfera, termosfera e ionosfera em baixas latitudes e região equatorial, durante o ciclo solar 24
• Beneficiário: Paulo Roberto Fagundes
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 13/17380-0 - Estudo da ionosfera em baixas latitudes usando ionossondas e GPS.
• Beneficiário: Kavutarapu Venkatesh
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado