Solar observations with ALMA have been offered since Cycle 4 (2016–2017), and all solar data of Cycle 4 and a part of the data of Cycle 5 (2017–2018) have already been released to the public. However, non-experts in the field of radio interferometers have some fundamental difficulties in analyzing the ALMA solar data. The most difficult obstacle to overcome in achieving scientific results from the ALMA solar data is the issue of image synthesis. To overcome this difficulty, we hold the workshop for discussing and resolving the problems of solar image synthesis.

The Rosseland Centre for Solar Physics (RoCS),
Institute of Theoretical Astrophysics,
The Faculty of Mathematics and Natural Sciences,
University of Oslo

2 - 5 March 2020 & 6 March 2020

Although the official main part of the workshop ends on March 5, we can use the meeting rooms of RoCS until Friday (6 March) for continuing the work begun during the workshop.


2 March 2020
10:00 -- 10:10Welcome address / Information from LOC
10:10 -- 11:00Overview of on synthesis imaging, deconvolution, and self-calibration
T. Bastian (NRAO)
11:00 -- 11:30Summary of the current solar calibration in the QA2 process and its problems/Single-Dish
I. Skokic (Hvar Observatory)
11:30 -- 12:00Summary of the current solar calibration in the QA2 process and its problems/Interferometer
M. Shimojo (NAOJ)
12:00 -- 13:30<Lunch Break>
13:30 -- 17:00 Status report of the development of solar image synthesis
15:15 -- 15:30Single-dish mappings S. White
15:30 -- 16:00<Cofee Break>
16:00 -- 16:20Development of tools for solar research with ALMA at RoCS: S. Wedemeyer (UiO)
16:20 -- 17:00Discussion - Aims of the Workshop and development priorities
17:30 Reception
3 March 2020
9:30 -- 10:15Summary of the workshop "Radio Interferometer and Single-Dish Data Combination" at Leiden
T. Bastian (NRAO)
10:15 -- 10:45Introduction of the datasets for the workshop
10:45 -- 11:00<Coffee Break>
10:15 -- 10:45 Grouping
    Candidate groups A participant can join plural groups.
  • Team A [INT] Self-calibration and its evaluation; How to do we look for suitable parameters for each science?
  • Team B [INT] How to apply the self-calibration for MOSAIC data?
  • Team C [INT] Tiger team for solving the issues in QA2 cal; anomalies of T_ant and XX-YY asymmetry.
  • Team D [SD] Tiger team for solving the problems in QA2 cal; flux calibration, and the scan pattern/serrations at the limb.
  • Team E [INT/SD] What is the best way to combine the solar INT and SD data?
  • Team F Astrometry and pointing
12:00 -- 13:30<Lunch Break>
13:30 -- 17:00Discussion and data Analysis
4 March 2020 All-day for discussion and data Analysis
5 March 2020
9:30 -- 12:00Discussion and data Analysis
12:00 -- 13:30<Lunch Break>
13:30 -- 15:30Summary report from each group
15:30The workshop is ended officially.
6 March 2020 The meeting rooms are kept for the participants of the workshop.

The data analysis in the workshop should be carried out on your PC. Please bring your laptop PC. It is good that CASA and SSW+IDL can be use on your PC.

VISA to visit Norway

  • Do you need a visa to visit Norway? ⇒ UDI's page
  • Who do not need a visa to visit Norway?⇒ UDI's page

Official travel guide to Oslo ⇒ Oslo Visitor Center

How to get RoCS from the city center of Oslo

  • Option 1: 3min walk from subway station “Blindern”. Lines 4+5. Connected to city centre (and city ring) frequently. About 10min from city centre.
  • Option 2: 5min walk from tram station “Universitetet”. Lines 17+18. Connected to city centre (about every 5min).
Google Map: Svein Rosselands Hus, Sem Sælands vei 13


The following list is our choice. There are many other hotels. Prices are typically around 1000-1300 NOK per night (breakfast included) but it might be possible to find something cheaper, too. We recommend booking something near a subway station as that is very convenient. We do not book a room for you. Please book yourself.

Closer to the university

SOC (Alphabet order)
Miroslav Barta (CAS)
Tim Bastian (NRAO)
Masumi Shimojo (NAOJ)
Sven Wedemeyer (UiO)
Sven Wedemeyer [Chair]
Mikolaj Szydlarski
Shahin Jafarzadeh
Henrik Eklund
Juan Camilo Guevara Gomez
Sneha Pandit

This workshop is supported by the Rosseland Centre for Solar Physics and the SolarALMA project with funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No. 682462), and by the Research Council of Norway through its Centres of Excellence scheme, project number 262622.

Please send comments and questions to the following E-mail address


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