LOFAR antenna development and initial observations of solar bursts

Details LOFAR antenna development and initial observations of solar bursts LOFAR antenna development and initial observations of solar bursts

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004p%26ss...52.1351s&link_type=abstract

Planetary and Space Science, Volume 52, Issue 15, p. 1351-1355.

Astronomy and Astrophysics

Astronomy

4

Scientific paper

We are developing and testing active baluns and electrically short dipoles for possible use as the primary wide band receiving elements in the low-frequency array (LOFAR) for long wavelength radio astronomy. Several dipoles of various designs and dimensions have been built and tested. Their useful range occurs when the dipole arms are approximately 18 to one wavelength long and the feedpoint is less than 12 wavelength above ground. An eight-element NRL LOFAR test array (NLTA) interferometer has been built and fringes have been observed from the brightest celestial sources in the frequency range from 10 to 50 MHz. The antenna temperatures vary from about 10% to 100% of the average brightness temperature of the galactic background. With these parameters it is easy to make the amplifier noise levels low enough that final system temperature is dominated by the galactic background.

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