:: Data Centre-CENTRE For GLOBAL CHANGE ::


List of 12 RWC's managed by ISES worldwide :
India (New Delhi)
USA (Boulder)
Russia (Moscow)
China (Beijing)
Canada (Ottawa)
Czech Republic (Prague)
Japan (Tokyo)
Australia (Sydney)
Sweden (Lund)
Belgium (Brussels)
Poland (Warsaw)
The European Space Agency (Noordwijk)
Related Links
International Space Environment Service
Global Change Data
Indian Space Data
Special Program
Visitor's  View

Overview -Regional Warning Centre
RWC - India
Daily RWC Message
Monthly Geophysical Bulletin
Ionospheric Data
Ionospheric Prediction Models
HF Link/Region Predictions
TEC Model for Indian Zone
Ionospheric Scintillations
Solar Activity Prediction
Related Links
Ionospheric Prediction Models ::...

:::: Introduction :

The radio communication and Space Physics group at NPL has been continuously engaged in characterizing and updating our knowledge of the Radio Environment (Tropospheric and Ionospheric Media) over India and around. 

There are primarily two reasons for advancing the state of ar in propagation research: firstly, the explosion in sophisticated electronic system hardware with zero failure rate has made the medium uncertainty as the only limiting factor in attaining super high performances. Secondly, the high data transmission rates, abetted by advanced systems and necessitated by economics of spectrum management require a much more accurate prediction of radio climatology than available currently.

As per the needs of different users, especially defence services, in the area of better radio communication and navigations in the country, NPL has developed several Ionospheric prediction models. The starting point in developing ionospheric prediction models is to make long-term solar activity predictions, because ionospheric parameters are essentially controlled by varying solar activity. 

RWC - NPL has developed its own techniques for long term solar activity predictions. The relationship between the sunspot numbers (R12) and foF2/TEC is usually not linear and it is advisable to fit second degree curves for different local times and latitudes and generate a set of constants for the Indian zone. Such constants have been used for developing different Ionospheric Prediction Models.

The accuracy of the prediction models depends upon the accuracy of the solar activity predictions. All our models are user friendly and are very simple to use on a Window or DOS based Pentium Computer.
:::: Note :
For Further Details, Kindly Contact Dr. A.K Upadhayaya. 
       2003 Data Centre, Centre for Global Change, National Physical Laboratory, Dr. K.S. Krishnan Marg, New Delhi-12, India.