What we look forward to in LOFAR 2.0: Live warning system to study solar eruptions

The Sun’s activity appears not only in the well-known 11-year Sunspot cycle, but also in short duration eruptions as flares and coronal mass ejections (CMEs). Such eruptive events, also known as space weather, can harmfully influence our Earth’s environment and technologies, such as GPS navigation, satellite communications and electric power grids. These events are accompanied by an enhanced radio emission of the Sun, especially in the frequency range (30-240 MHz) covered by LOFAR.

Published by the editorial team, 19 June 2020

Hence, LOFAR is of great interest for solar physicists, since LOFAR with its spectroscopic and imaging capabilities is well suited for studying active processes in the Sun’s corona. This is the reason why the Key Science Project “Solar Physics and Space Weather with LOFAR” was founded. During LOFAR’s commissioning phase and the first cycles of regular observations, the solar KSP performed observations of the Sun, together with ASTRON.

DISTURB

On 30 January 2019, ASTRON, together with S[&]T started the design of a solar radio telescope to directly detect eruptions on the sun, at the request of the Ministry of Defence; the Royal Netherland Meteorological Institute (KNMI) is also involved. The project is called DISTURB (Disturbance detection by Intelligent Solar Radio Telescope or (Un)perturbed Radiofrequency Bands). “We finished the initial development phase on June 15th,’ says ASTRON senior scientist Michiel Brentjens. “Currently we are looking for funding, so that in the next three to five year we can build a fully functional prototype.” That prototype will then be able to directly detect eruptions on the Sun. Eventually, the solar telescope might be scaled up to seven to twelve stations worldwide, providing global coverage.

An impression of what the solar radio telescope will look like. (Credit: ASTRON)

Michiel Brentjens points out that DISTURB is not so much an expansion of LOFAR as it is reusage of its technology. However, the development of this solar radio telescope will enable LOFAR 2.0 to study space weather more quickly and more accurately. DISTURB warns LOFAR that a solar eruption is taking place, so that LOFAR immediately can start measuring solar radio waves. Brentjens: “We no longer will have to stare at the Sun for weeks up to months without something happening; now we can immediately respond to a live warning from DISTURB; much more efficient!”

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On June 13-17, the LOFAR Family Meeting took place in Cologne. After two years LOFAR researchers could finally meet in person again. The meeting brings together LOFAR users and researchers to share new scientific results.
https://www.astron.nl/dailyimage/main.php?date=20220621

Our renewed ‘Melkwegpad’ (Milky Way Path) is finished! The new signs have texts in Dutch on the one side and in English on the other side. The signs concerning planets have a small, 3D printed model of that planet in their centre.
https://www.astron.nl/dailyimage/
#Melkwegpad @RTVDrenthe

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The background drawing shows how the subband correlator calculates the array correlation matrix. In the upper left the 4 UniBoard2s we used. The two ACM plots in the picture show that the phase differences of the visibilities vary from 0 to 360 degrees.

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https://www.astron.nl/dailyimage/main.php?date=20220607

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