3:30 PM - 3:45 PM
[PEM12-16] Equatorial Sporadic E layers as seen from GNSS radio occultations
★Invited Papers
Keywords:Ionosphere, sporadic E layer, GNSS radio occultation
GNSS RO signals are very sensitive to vertical electron density gradients in the Earth’s ionosphere. This becomes visible as strong fluctuations in, e.g., signal-to-noise ratio recordings, which allow detecting ionospheric disturbances like sporadic E (Es) layers in the lower ionospheric E region. Due to the geometry of the GNSS RO technique, it enables for the first time receiving a global and comprehensive picture of the occurrence and the properties of Es layers in a high spatial resolution.
In this presentation, we like to focus on the difference between midlatitude and low-latitude sporadic E properties. We observed that the Es occurrence rate shows a pronounced depression directly at the magnetic equator. Further, the equatorial Es altitudes show a strong longitudinal variability which is not the case at midlatitudes. We will give and explanation attempt for the observed features in the equatorial region using equatorial electric field data provided by the Swarm satellites.