Articles | Volume 25, issue 2
Ann. Geophys., 25, 457–473, 2007
Ann. Geophys., 25, 457–473, 2007

  08 Mar 2007

08 Mar 2007

Combined radar observations of equatorial electrojet irregularities at Jicamarca

D. L. Hysell1, J. Drexler1, E. B. Shume1, J. L. Chau2, D. E. Scipion3,2, M. Vlasov4, R. Cuevas4, and C. Heinselman5 D. L. Hysell et al.
  • 1Earth and Atmospheric Science, Cornell University, Ithaca, NY, USA
  • 2Radio Observatorio de Jicamarca, Instituto Geofísico del Perú, Lima
  • 3Electrical and Computer Engineering, University of Oklahoma, Norman, OK, USA
  • 4Electrical and Computer Engineering, Cornell University, Ithaca, NY, USA
  • 5SRI International, Menlo Park, CA, USA

Abstract. Daytime equatorial electrojet plasma irregularities were investigated using five distinct radar diagnostics at Jicamarca including range-time-intensity (RTI) mapping, Faraday rotation, radar imaging, oblique scattering, and multiple-frequency scattering using the new AMISR prototype UHF radar. Data suggest the existence of plasma density striations separated by 3–5 km and propagating slowly downward. The striations may be caused by neutral atmospheric turbulence, and a possible scenario for their formation is discussed. The Doppler shifts of type 1 echoes observed at VHF and UHF frequencies are compared and interpreted in light of a model of Farley Buneman waves based on kinetic ions and fluid electrons with thermal effects included. Finally, the up-down and east-west asymmetries evident in the radar observations are described and quantified.