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- A. A. Konovalenko, Institute of Radio Astronomy of the National Academy of Sciences of Ukraine, Kharkiv, Ukraine
- G. Mann, Leibniz Institute for Astrophysics, Potsdam, Germany
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By combining observations from the Low Frequency Array (LOFAR) and Ukrainian radio telescopes such as the Giant Ukrainian Radio Telescope (GURT) and UTR-2, more information can be obtained compared to using the radio telescopes separately. This enables more detailed and accurate studies of solar radio physics and Jovian radio emissions as well as planetary lightning, extra-solar planets, flaring stars, and pulsars. In addition, simultaneous use of spacecraft data from Cassini and Stereo can provide supplementary information.
LOFAR is almost fully deployed. It consists of low-cost dual-polarized wire antennas deployed as 24 core stations and 15 remote stations in the Netherlands and eight international stations in France, Germany (5 stations), Sweden, and UK. With an exceptional resolution of a few arc-seconds and a sensitivity of about 10 milli-Jansky, LOFAR will make observations in the frequency ranges 10-80 MHz and 120-240 MHz. A high-speed optical network provides connection to the central processor in the Netherlands where the data from all stations are processed.
GURT is being built at the site of the UTR-2 radio telescope close to Kharkov, Ukraine. It covers the frequency range 10-70 MHz. The elements are dual-polarized and are grouped in sub-arrays of 25 elements. Fully deployed, there will be up to 100 sub-arrays giving a total of 2,500 elements. The final effective area of GURT will be comparable to the LOFAR core. Data from LOFAR Low Band Antennas in the frequency range 10-80 MHz (10-30 MHz with reduced sensitivity) will be used together with GURT data. Comparisons of the dynamic spectra from the two stations will be made to study differences in frequency, time, and intensity. The data from the stations can also be combined to make use of an extended frequency range and a very long baseline of more than 2,000 km, which is almost the double of the longest LOFAR baseline. The addition of the extra baseline will improve the angular resolution and allow for sky-images of better quality than by LOFAR itself can provide.
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| 1. |
Karlsson et al.:
Combined observations with LOFAR and the Giant Ukrainian Radio Telescope, in Planetary Radio Emissions VII, edited by H. O. Rucker, W. S. Kurth, P. Louarn, and G. Fischer,
Austrian Academy of Science Press,
2011.
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| 2. |
Konovalenko et al.:
New antennas and methods for the low frequency stellar and planetary radio astronomy, in Planetary Radio Emissions VII, edited by H. O. Rucker, W. S. Kurth, P. Louarn, and G. Fischer,
Academy of Science Press,
2011.
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| 3. |
Konovalenko et al.:
Solar radio emission and space weather studies with the ground-based existing (and future) low-frequency radio telescopes,
Presentation at the Solar Key Science Project Workshop II, Potsdam,
2009.
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