Contribution of Low Latitude Electrodynamics to Gravity Waves

Changes in (a) TEC over South America and (b) vertical drifts from JULIA and magnetometer data over Jicamarca (Habarulema et al., (2016): Simultaneous storm time equatorward and poleward large-scale TIDs on a global scale, Geophys. Res. Lett., 43, doi:10.1002/2016GL069740)



Electrodynamic changes plays the main role in ionospheric plasma motion in low latitudes. Additional electric field arising from penetration and disturbance dynamo contributions drastically alters the conventional understanding of low latitude electrodynamics. A number of processes take place including vertical coupling between equatorial electrojet and neutral atmosphere through Lorentz forcing. During the coupling process, atmospheric gravity waves can be launched resulting into travelling atmospheric disturbances.
In this project, we wish to answer the questions:
(a) Are gravity waves always present in low latitudes at all times?
(b) When are they frequently observed?
(c) What effect do they have on other latitude regions and what is their significance?
To answer the above questions, it is proposed to look at low latitude data during extremely quiet and disturbed conditions and on a long-term basis