New techniques for auroral irregularity studies with COSCAT |
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| Authors: | P Eglitis I W McCrea T R Robinson T Nygrén K Schlegel T Turunen T B Jones |
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| Institution: | (1) Department of Physics and Astronomy, Leicester University, Leicester, LE1 7RH, UK;(2) Rutherford Appleton Laboratory, Chilton, Didcot, UK;(3) Physics Department, University of Oulu, Oulu, Finland;(4) Max-Planck-Institut für Aeronomie, D-3411 Katlenburg-Lindau, Germany;(5) Sodankylá Geophysical Observatory, Finland;(6) Uppsala Division, Swedish Institute of Space Physics, S-755 91 Uppsala, Sweden;(7) Present address: The Department of Astronomy, Uppsala University, Uppsala, Sweden |
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| Abstract: | The COSCAT system enables the detection of E-region auroral backscatter with the EISCAT remote receivers at magnetic aspect angles close to 90°. This is achieved by utilising a low-power transmitter stationed in Oulu, Finland. Many important observations of E-region irregularities have been achieved with this simple experiment. Recent studies have attempted to push the COSCAT system to its experimental limits. Firstly, the CW signal has been phase-modulated with 13-bit Barker codes with baud lengths of 40, 70 and 100  s. Interpretation of the received power allows the spatial distribution of the auroral scatterers to be determined. The second advance is in the use of a sophisticated correlator program which allows data to be buffered within the correlator at very high time resolution. This enables the coherent backscatter power to be sampled every 12.5 ms and the full auto-correlation function to be measured every 100 ms. These measurements allow the COSCAT system to be employed for the first time in an investigation of the growth and decay of the auroral irregularities. |
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| Keywords: | Ionosphere (ionospheric irregularities) Radio science (Instruments and techniques) |
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