A new wideband, fully steerable, decametric array at Clark Lake

Erickson, W. C.; Fisher, J. Richard

doi:10.1029/rs009i003p00387

Cited by 27 publications

(11 citation statements)

References 28 publications

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“…For example, the use of aperture arrays to implement electronically steerable antennas with high flexibility and low cost is a pathfinder activity for the SKA, and the MWA and LOFAR are pioneering this technology on medium to large scales. While electronic steering with no moving parts has been used before, notably with the teepee-tee (TPT) array at Clark Lake (Erickson & Fisher 1974) (also used at Nancay), such systems typically used phase rotation which is a narrow-band technique. The MWA instead uses switched delay lines with fine-grained steps, implemented using modern fabrication techniques to achieve the goals of low-cost, accurately steerable beams with a wide fractional bandwidth.…”

Section: Discussionmentioning

confidence: 99%

The Murchison Widefield Array: The Square Kilometre Array Precursor at Low Radio Frequencies

Tingay

Goeke

Bowman

et al. 2013

Publ. Astron. Soc. Aust.

1,129

637

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The Murchison Widefield Array (MWA) is one of three Square Kilometre Array Precursor telescopes and is located at the Murchison Radio-astronomy Observatory in the Murchison Shire of the mid-west of Western Australia, a location chosen for its extremely low levels of radio frequency interference. The MWA operates at low radio frequencies, 80-300 MHz, with a processed bandwidth of 30.72 MHz for both linear polarisations, and consists of 128 aperture arrays (known as tiles) distributed over a ß3-km diameter area. Novel hybrid hardware/software correlation and a real-time imaging and calibration systems comprise the MWA signal processing backend. In this paper, the as-built MWA is described both at a system and sub-system level, the expected performance of the array is presented, and the science goals of the instrument are summarised.

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Section: Discussionmentioning

confidence: 99%

The Murchison Widefield Array: The Square Kilometre Array Precursor at Low Radio Frequencies

Tingay

Goeke

Bowman

et al. 2013

Publ. Astron. Soc. Aust.

1,129

637

View full text Add to dashboard Cite

show abstract

“…Scientifically, the realization that many sources have inverted radio spectra due to synchrotron self-absorption or freefree absorption as well as the detection of (ultra-) steep spectra in pulsars and high redshift radio galaxies highlighted the need for data at lower frequencies. Further impetus for lowfrequency radio data came from early results from Clark Lake (Erickson & Fisher 1974;Kassim 1988), the Cambridge sky surveys at 151 MHz, and the 74 MHz receiver system at the VLA (Kassim et al 1993(Kassim et al , 2007. In this same period, a number of arrays were constructed around the world to explore the sky at frequencies well below 1 GHz (see Table 2 in Stappers et al 2011, and references therein).…”

Section: Introductionmentioning

confidence: 99%

LOFAR: The LOw-Frequency ARray

Haarlem

Wise

Gunst

et al. 2013

A&A

2,007

783

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LOFAR, the LOw-Frequency ARray, is a new-generation radio interferometer constructed in the north of the Netherlands and across europe. Utilizing a novel phased-array design, LOFAR covers the largely unexplored low-frequency range from 10-240 MHz and provides a number of unique observing capabilities. Spreading out from a core located near the village of Exloo in the northeast of the Netherlands, a total of 40 LOFAR stations are nearing completion. A further five stations have been deployed throughout Germany, and one station has been built in each of France, Sweden, and the UK. Digital beam-forming techniques make the LOFAR system agile and allow for rapid repointing of the telescope as well as the potential for multiple simultaneous observations. With its dense core array and long interferometric baselines, LOFAR achieves unparalleled sensitivity and angular resolution in the low-frequency radio regime. The LOFAR facilities are jointly operated by the International LOFAR Telescope (ILT) foundation, as an observatory open to the global astronomical community. LOFAR is one of the first radio observatories to feature automated processing pipelines to deliver fully calibrated science products to its user community. LOFAR's new capabilities, techniques and modus operandi make it an important pathfinder for the Square Kilometre Array (SKA). We give an overview of the LOFAR instrument, its major hardware and software components, and the core science objectives that have driven its design. In addition, we present a selection of new results from the commissioning phase of this new radio observatory.

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“…This is because the number of radio telescopes suitable to getting a radio image of the Sun at low frequencies is very small. Many years ago the low-frequency facilities were operated at Culgoora (Labrum, 1985) in Australia at 40-320 MHz and at Clark Lake (Erickson et al, 1974) in the USA at 20-110 MHz. Unfortunately, they were taken out of service.…”

Section: Introductionmentioning

confidence: 99%

An upgrade of the UTR-2 radio telescope to a multifrequency radio heliograph

Stanislavsky¹,

Konovalenko²,

Koval³

et al. 2018

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We present the broadband heliograph based on the UTR-2 radio telescope for obtaining the solar corona images in the frequency range 8-32 MHz with the frequency resolution 4 kHz, the time resolution up to 1 ms, and under the dynamic range about 90 dB. The instrument provides new possibilities to measure the non-thermal radiation in an unprecedented way for a better understanding of the radio emission processes in solar corona. We describe various aspects of the instrument including its antenna system, receiver front end, digital hardware and the data acquisition. This is the lowest-frequency heliograph operating in the world. It allows us to detect radio emission from solar radio sources in the upper solar corona near frequencies of ionosphere cut-off. The instrument performance is illustrated with source maps of solar radio bursts at low frequencies during the observational campaigns of 2013 and 2015.

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A new wideband, fully steerable, decametric array at Clark Lake

Cited by 27 publications

References 28 publications

The Murchison Widefield Array: The Square Kilometre Array Precursor at Low Radio Frequencies

The Murchison Widefield Array: The Square Kilometre Array Precursor at Low Radio Frequencies

LOFAR: The LOw-Frequency ARray

An upgrade of the UTR-2 radio telescope to a multifrequency radio heliograph

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