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Effect of meteor ionization on sporadic‐E observed at Jicamarca

Relatively little progress has been made in the study of equatorial Sporadic‐E when compared to the study of mid‐latitude 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.