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Sub-second structures in low frequency solar radio observations

Online hands-on workshop
30. March - 1st April 2021

Important message to participants: due to the coronavirus situation, this workshop will be held online, using zoom and slack.

This workshop focuses on novel observations obtained with LOFAR to study sub-second structures of solar radio emissions. It will provide training to analyse this data to solar radio astronomers and is directed to PhD students, postdocs and researchers.

Registration is open until March 22nd.

Goal of the workshop

Recent observations with LOFAR have revealed several features which are inconsistent with the current understanding of the solar radio emission mechanisms. Such observations at sub-second scales require new models and a re-thinking of the current understanding of the non-thermal processes in the outer corona. In addition, recent studies showed that radio-wave propagation effects, mainly scattering, strongly influence the observed emissions in a number of ways (www.issibern.ch/teams/lofar).
The aim of this two-day intensive workshop is to discuss the challenges introduced by radio-wave propagation effects with members of the solar radio community and focus on the interpretation of puzzling sub-second structures. Using fully-processed, calibrated imaging spectroscopy LOFAR data, we aim to have a real-time analysis and focused discussion on the puzzling features observed in radio dynamic spectra. Several of the features identified for the purposes of this workshop have not been reported in the past, and are until this day unpublished.
The workshop will focus on solar radio physics at sub-second scales: from LOFAR observations to new understanding of solar physics and sub-second solar radio burst properties.

Target audience

This workshop is aimed at solar radio astronomers at the PhD level and above.

Structure

We aim to provide participants with the science-ready datasets of uninterpreted features seen in LOFAR data in order to boost the discovery potential of the currently available observations. This workshop will be structured with practical lectures and hands-on training activities (practical sessions).
For the analysis, openly-available SSW LOFAR routines (IDL) will be used which will also be introduced and explained during the topic introductions and practicals. Smaller working groups will be formed and the datasets will be divided according to the attendees’ topics of interest.
Participants are expected to use their own laptop. The workshop is best suited to participants familiar to SSW and who have access to SSW in their home institutions. An installation of SSW is necessary for the practicals: Installation instructions.
The workshop will be held online. Participants will receive a zoom link and slack invitation. The sessions will be held on zoom and the slack channel will be available as a mean for further discussion and group collaboration. Each practical session has a specific focus linked to the lectures preceding it, and participants are therefore expected to participate in all practical sessions during the workshop.

Requirements

The workshop is open to solar radio astronomers from PhD level and above.
The participants are expected to bring their laptops with SSW installation which should include LOFAR in the instruments list (https://sohowww.nascom.nasa.gov/solarsoft/radio/lofar/).

Registration

Please register here before March 22nd. The registration is free of charge. Links to connect to the meeting will be communicated to the participants by email.

Preliminary program

Please find a tentative program below. The workshop is held from 1pm to 5pm (London time) during the three days of the workshop.

Tuesday 30. March

1:00 - 1:45 Introduction on LOFAR solar data (Nicolina Chrysaphi) [lecture's presentation]
1:45 - 2:45 Imaging and spectroscopy with LOFAR solar data (Hamish Reid)
3:00 - 4:00 Practical session: handeling LOFAR data and imaging
4:00 - 5:00 Correcting LOFAR observations for ionospheric and instrumental effects (Mykola Gordovskyy) [lecture's presentation]

Wednesday 31. March

1:00 - 2:00 Fine structures in LOFAR solar data (Alexey Kusnetsov)
2:00 - 2:45 Practical session: analysis of fine structures in LOFAR spectra
3:00 - 4:00 Scattering effects in radio observations 1/2 (Eduard Kontar) [lecture's presentation]
4:00 - 5:00 Practical session: Use of ray-tracing simulations [tutorial notes]

Thursday 1st April

1:00 - 2:00 Scattering effects in radio observations 2/2 (Eduard Kontar) [lecture's presentation]
2:00 - 5:00 Practical session: use of LOFAR data (in groups)

Contact

Sophie Musset: sophie.musset (at) glasgow.ac.uk

Nicolina Chrysaphi: nicolina.chrysaphi (at) obspm.fr