Instruments:cht

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Chatanika IS Radar

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ACKNOWLEDGMENTS

The Chatanika incoherent scatter radar was supported by the National Science Foundation.

Instrument/Model Description

The incoherent scatter transmitter station at Chatanika, Alaska (65.1N, 147.4W) operated between 1971 and 1982. It was moved to Sondrestrom in 1982-1983, where it has been in operation since 1983. There are generally 7 record types (KINDAT) for each Chatanika experiment that are usually inputs or outputs to a program called VAST, which calculates electric fields, vector velocities and conductivities. VAST assumes the velocity field varies linearly with time. Data from five positions are used to find the three line-of-sight velocities at the time of the middle observation. Full error propagation, including covariance terms, is included. The density and temperature data are combined to obtain a spatial average for the time of the middle observation.

In addition, several criterea involving the least squares fit, as well as relative absolute uncertainties, have been examined to determine whether the derived F-region vector velocities are converted to electric fields, and the good values are height integrated to find the best possible estimate of the electric field. Starting in the D-region, the averaged electron densities are used to calculate the conductivities. The calculation has been improved to explicitly include the ion-neutral collision frequencies and to include a model atmosphere.

There are 4 areas in the summary plots. There are image plots as a function of height and time of the electron density, electron temperature, and ion temperature. The ion drift near 300 km is plotted in the perpendicular east, north and parallel directions. There are 2 days per page. For the image plots, the data above 60 degrees elevation is averaged over 30 minutes. The height bin is 6 km for the electron density, which is power channel data from the center position used as input to VAST (KINDAT=5101 or 5102). The electron density has been both calibrated and corrected for temperature effects. The height bin for the electron and ion temperatures is 40 km. The temperatures plotted are derived paramaters from the OAC (old auto-correlator, KINDAT=15013) and are outputs from VAST.

Summary Plots for Chatanika IS Radar

Other IS Radars

Daily Listing for IS/HF Radars


-Revised 20 Feb 2002 by Barbara Emery