ISRO’s GIRI
ISRO
established the Gadanki Ionospheric Radar Interferometer (GIRI) near Tirupati
in Andhra Pradesh. It was set up at the National Atmospheric Research
Laboratory (NARL) which is an autonomous research institute of the Department
of Space.
Features of GIRI
System
Ø It is a 30 MHz radar system that will be engaged in
meteor and space weather research in a comprehensive way.
Ø It consists of a rectangular antenna array of 160
two-element Yagi-antenna, arranged in a 20x8 matrix, 20 transmitter units, 6
digital receivers including data processing systems, a radar controller, and a
host computer.
Ø Its primary objective is to carry out unattended
observations towards studying the forcing from the sun like variation in solar
flux, solar flare and magnetic storm on the ionospheric irregularities.
Ø It also seeks to study unattended observations from
the underneath atmosphere (e.g., waves generated by weather phenomena) on the
ionospheric irregularities.
Ø It will provide important information on the angular
location of plasma irregularities during the onset phase and its relationship
to background ionospheric state parameters and sunset terminator.
Ø Investigations made using this facility are expected
to improve the skill in Equatorial Plasma Bubble (EPB) forecasting which is
detrimental for satellite based navigation/communication applications.
About National
Atmospheric Research Laboratory
· It is an autonomous society supported by Department of
Space and is located at Gadanki near Tirupati in Andhra Pradesh.
· It is one of the specialized atmospheric research in
the country to conduct basic atmospheric research, indigenous technology
development for atmospheric probing and weather and climate modeling.
· It regularly operates state-of-the-art MST radar,
Rayleigh / Mie Lidar, Boundary Layer Lidar, Sodium Lidar, Lower Atmospheric
Wind Profiler, Sodar and Dual frequency GPS receiver.
· Its facilities are available for national and
international scientists to conduct atmospheric research.
· The proposed up-gradation of the upcoming active array
MST radar into Incoherent Scatter Radar (ISR) will provide a unique opportunity
for scientists from both home and abroad to conduct frontline atmospheric and
ionospheric research.
- With the ISR upgrade, NARL will become the first comprehensive low latitude observatory in the world.
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