(THE GIST OF PIB) Ionosphere

(DECEMBER-2023)

A team of scientists from the Indian Institute of Geomagnetism (IIG) have examined the long-term seasonal ionospheric observations at Indian Antarctica station Bharati between 2010 and 2022 and also with solar activity following the Sun's 11-year cycle.

It is a part of Earth’s upper atmosphere, which is partially ionised, extending from 100-1000 km.
The ionosphere at polar regions is highly dynamic and acts as a major energy sink for space weather events, and related processes in magnetosphere-ionosphere systems as the magnetic field lines are vertical in this region.
It is an interesting layer which overlaps the mesosphere, thermosphere, and exosphere.
It’s a very active part of the atmosphere, and it grows and shrinks depending on the energy it absorbs from the sun.
The ionospheric observations in Antarctica are few compared to the Arctic region due to geographic limitations and limited number of stations.

Decade-long ionospheric observations at Bharati station, Antarctica, found a substantial seasonal variation with maximum total electron count (TEC) in equinoctial months followed by the summer and winter.
The scientists attributed the peak ionisation to particle precipitation and transportation of convectional plasma from high latitudes.
Also, the maximum ionospheric density in the summer months where 24 hours sunlight is present (polar days), was about twice more than that of polar nights at the Bharati region.
Significance of the study: Such long-term studies can help understand effects of the ionosphere on satellite-based navigation and communication systems and to mitigate them.