Effect of meteor ionization on sporadic-E observed at Jicamarca

Akshay Malhotra, John D. Mathews, Julio Urbina

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16 Scopus citations


Relatively little progress has been made in the study of equatorial Sporadic-E when compared to the study of midlatitude Sporadic-E. Indeed, it is unclear if Sporadic-E has been observed at all near the geomagnetic equator using any technique other than the ionosonde. In particular, there have been no reports of Sporadic-E observed using the Jicamarca Radio Observatory (JRO) 50 MHz radar. The overwhelming - in SNR terms - presence of the nearly ubiquitous Equatorial Electrojet (EEJ) is the likely reason Sporadic-E has not been reported at JRO as well as at other similar radars near the geomagnetic equator. We present here what we believe to be the first Sporadic-E (defined here as altitude-narrow E-region layers that last tens of minutes) observations from JRO. The structure and characteristics of these equatorial Sporadic-E layers is compared with their mid-latitude counterparts. We also demonstrate the immediate effect of meteor-produced ionization on the formation and evolution of the equatorial Sporadic-E layers.

Original languageEnglish (US)
Article numberL15106
JournalGeophysical Research Letters
Issue number15
StatePublished - Aug 16 2008

All Science Journal Classification (ASJC) codes

  • Geophysics
  • General Earth and Planetary Sciences


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