Ionospheric absorption derived by riometers measurements at 30/38.2 MHz.

These kind of measurements are useful to determine the ionospheric absorption in the lower ionosphere and to contribute to the physical-chemical mechanism in the D ionospheric region. The 38.2 MHz riometer was installed at Terra Nova Bay during the austral summer 1993-94, while the 30 MHz riometer is working since the austral summer 1994-95.

The riometric station is operating in automatic data acquisition during the austral winter since February 1995. Another 38.2 MHZ riometer has been installed at Eskimo Point during austral summer 1997-98 and it's acquiring data also in austral winter. In the austral summer, the stations operate under human control while in the austral winter the acquisition is automatic.