Electron density irregularities in the equatorial ionosphere at night are understood terms of plasma bubbles, which produced by transport low-density from bottomside F region to topside. Equatorial bubbles (EPBs) have been detected various techniques on ground and space. One distinguishing characteristics EPBs identified long-term observations is systematic seasonal longitudinal variation EPB a...

[1] Horizontal neutral winds play an important role in lowlatitude ionospheric E and F-region dynamics. In particular, the zonal winds have strong effects on the local structure of the low-latitude ionospheric current system. Accurate wind specification is therefore essential for modeling these currents. In order to investigate the retrieval of eastward electric fields from satellite-derived eq...

The evening pre-reversal vertical drift velocity enhancement (PRE) constitutes an important seeding mechanism for the generation of F region irregularities. Ion density and drift measurements from ROCSAT-1 and DMSP satellites are used to examine the correlation of longitudinal/seasonal (l/s) variations in the evening pre-reversal vertical drift velocity at the magnetic equator in the topside io...

Airglow imaging at mid-latitude stations often show intensity modulations associated with medium scale travelling ionospheric disturbances (MSTID), while those carried out near the equatorial regions reveal depletions caused by equatorial plasma bubbles (EPB). Two all sky cameras are used to observe plasma depletions in the 630.0 nm emission over the equatorial ionization anomaly (EIA) region, ...

The day-to-day variability in ionospheric irregularity generation giving rise to equatorial scintillation has remained an unresolved issue over many decades (Basu and Basu, 1985). We take a fresh look at the problem utilizing the global imagery provided by the GUVI instrument on NASA’s TIMED satellite. GUVI has been acquiring images of 135.6-nm emission in the Earth’s ionosphere/thermosphere sy...

The presence of the dawn-to-dusk electric field about 4 mV/m in Jovian inner magnetosphere and its response to enhancement solar wind dynamic pressure are still a mystery rotation-dominated magnetosphere. Previous studies have suggested that magnetosphere-ionosphere (M-I) coupling via Region 2-like (R2-like) field-aligned current (FAC) could be origin field. This study investigates whether is f...

The plasma density distribution in the equatorial and low latitude ionosphere can often be severely disturbed during active space weather events that have paramount impacts on long-distance high frequency (HF) radio wave (Skywave) communications through ionosphere. On St. Patrick's Day storm of 17 March 2015, a deep depletion with more than two orders magnitude was observed over narrow longitud...

The unique geometry of the geomagnetic field lines over the equatorial ionosphere coupled with the E– W electric field causes the equatorial ionization anomaly (EIA) and equatorial spread-F (ESF). Ionosonde data obtained at a chain of four stations covering equator to anomaly crest region (0.3 to 33 °N dip) in the Indian sector are used to study the role of EIA and the associated processes on t...

Plasma depletions in the disturbed equatorial ionosphere are known to be associated with magnetic fluctuations and Alfvén waves. Here, using data from Swarm B satellite's vector field magnetometer electric fields instrument at an altitude of ?500 km, we present evidence standing modes trapped within strong density depletions. Fourier transforms (?E) (?B) perturbations reveal harmonic structure ...