Introduction to IRIS
The Kilpisjärvi IRIS imaging riometer in northern Finland (69.05° N, 20.79° E) is supervised by Lancaster University (UK) and operated in conjunction with Sodankylä Geophysical Observatory (SGO), Finland. It has been in operation since 2nd September 1994. IRIS is funded by the Science and Technology Facilities Council. The site is kindly loaned by METLA, the Finnish Forest Research Institute.
The system operates at 38.2 MHz and produces an array of 49 narrow beams with widths between 13° and 16°. The phasing of the array is achieved using an assembly of Butler matrices. The basic scanning interval of the array is one second. For further technical details see the system specifications.
Examples of results obtained from IRIS can be seen on the IRIS highlights page.
More information about IRIS
- IRIS data and plots can be requested using the automated data request facility.
- IRIS system specifications.
- A description of the algorithm used to generate the quiet day curves.
- ‘Rules of the road’ for using IRIS data.
- Summary plots of IRIS data, and how to interpret them.
- IRIS utilities to calculate when scintillation can be seen in which beam, etc.
- IRIS highlights.
- Equipment used inside IRIS (restricted access).
The following related pages may also be of interest:
- Riometer and imaging riometer database (list of known riometers around the world containing their location and other details).
- Search our publication database for publications using IRIS data.
- Real-time access to IRIS data.
For enquiries about IRIS please contact us.