Contributions of Neutral Wind and Electroject to the Dynamics of Equatorial Ionization Anomaly

Contributions of Neutral Wind and Electroject to the Dynamics of Equatorial Ionization Anomaly 

Sovit Khadka1, 2, Cesar Valladares2 and Rezy Pradipta2

1Physics Department, 2Institute for Scientific Research, Boston College, Massachusetts, USA

Correspondence to:

S. M. Khadka
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Key Points:

• New GPS data provide insights on the present-day crustal deformation of the Peruvian Andes
• We describe the kinematics and boundaries of the Peruvian Forearc Sliver and Subandean retro-shortening rates
• We map a highly heterogeneous interseismic coupling pattern of the Nazca megathrust at the scale of the 2200 km of the Peruvian margin


The response of Equatorial Ionization Anomaly (EIA) to the variability of the Equatorial Electrojet (EEJ) and neutral winds in the American low latitude regions is studied using ground based observations . The EEJ strengths are determined using magnetometers and the trans-equatorial neutral wind profile during the day is estimated using Second-generation, Optimized, Fabry-Perot Doppler Imager (SOFDI) located near geomagnetic equator. EIA is calculated using total electron content (TEC) data measured by Global Positioning System (GPS) from the Low-Latitude Ionospheric Sensor Network (LISN). We find that the spatial configuration such as strength, shape, amplitude and latitudinal extension of the EIAs are generally affected by equatorial electrojet. The asymmetries on EIA crests are observed more frequently during solstice than in equinox season. Results also show that meridional neutral winds have a significant effect on generation of the asymmetry on EIA crests as seen through TEC distributions.

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