Occurrence of the blanketing sporadic E layer during the recovery phase of the October 2003 superstorm

Autor(es)

Denardini, Clezio Marcos ; Araujo Resende, Laysa Cristina ; Moro, Juliano ; Chen, Sony Su

• Tipo de documento: Artigo Científico
• Fonte: EARTH PLANETS AND SPACE; v. 68, p. 9-pg., 2016-05-14.

Resumo

We have routinely monitored the total frequency (ftEs) and the blanketing frequency (fbEs) of sporadic E layers with the digital sounder under the magnetic equator in the Brazilian sector. Sporadic layers appear in the equatorial region (Es-q) at heights between 90 and 130 km, mainly due to irregularities in the equatorial electrojet current. However, during the recovery phase of the October 2003 superstorm, an anomalous intensification of the ionospheric density that exceeded the normal ambient background values for local time and location was observed. The parameter fbEs rose to almost 7.5 MHz during this event, due to a type "c" blanketing sporadic layer (Es-c), which is driven by wind shear. This result is discussed in terms of the atmosphere dynamics based on magnetic signature of the equatorial electrojet current using magnetometer data. Also, using data measured by sensors onboard the Geostationary Operational Environmental Satellite (GOES) 10 we analyze the possible influence of the solar flare-associated X-ray flux as an additional source of ionization. (AU)

• Processo FAPESP: 14/11198-9 - Análise do Efeito de Campos Elétricos Perturbados nas Camadas Es em Regiões Equatoriais e de Baixas Latitudes
• Beneficiário: Láysa Cristina Araújo Resende Chagas
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• 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