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ALMA – The key to the Sun’s coronal heating problem.

Total Cost €


EC-Contrib. €






 SolarALMA project word cloud

Explore the words cloud of the SolarALMA project. It provides you a very rough idea of what is the project "SolarALMA" about.

identification    implications    heating    polarisation    kelvin    coronal    clear    heated    physics    impeded    temporal    co    spatial    transported    potentially    observations    offers    questions    physical    dissipated    intensity    fundamental    million    array    impressive    how    contributions    accurate    chromospheric    atacama    transport    contemporary    radio    spectral    chromosphere    optimisation    responsible    stellar    energy    linear    submillimeter    complementary    mechanisms    temperatures    radiation    excess    thermal    recombination    dissipation    interior    resolution    tools    valuable    sun    dynamics    heights    layers    diagnostics    atmospheric    molecular    lines    wavelengths    narrow    effect    serves    magnetic    solar    sinks    thermometer    sources    interferometric    structure    continuum    outer    lies    preparation    mapping    alma    solving    millimeter    interpretation    zeeman    small    numerical    diagnostic    kinetic    exploited    dominant    accessible    simulations   

Project "SolarALMA" data sheet

The following table provides information about the project.


Organization address
address: PROBLEMVEIEN 5-7
city: OSLO
postcode: 313

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.

 Coordinator Country Norway [NO]
 Project website
 Total cost 1˙995˙963 €
 EC max contribution 1˙995˙963 € (100%)
 Programme 1. H2020-EU.1.1. (EXCELLENT SCIENCE - European Research Council (ERC))
 Code Call ERC-2015-CoG
 Funding Scheme ERC-COG
 Starting year 2016
 Duration (year-month-day) from 2016-09-01   to  2021-08-31


Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 
1    UNIVERSITETET I OSLO NO (OSLO) coordinator 1˙995˙963.00


 Project objective

How are the outer layers of the Sun heated to temperatures in excess of a million kelvin? A large number of heating mechanisms have been proposed to explain this so-called coronal heating problem, one of the fundamental questions in contemporary solar physics. It is clear that the required energy is transported from the solar interior through the chromosphere into the outer layers but it remains open by which physical mechanisms and how the provided energy is eventually dissipated. The key to solving the chromospheric/coronal heating problem lies in accurate observations at high spatial, temporal and spectral resolution, facilitating the identification of the mechanisms responsible for the transport and dissipation of energy. This has so far been impeded by the small number of accessible diagnostics and the challenges with their interpretation. The interferometric Atacama Large Millimeter/submillimeter Array (ALMA) now offers impressive capabilities. Due to the properties of the solar radiation at millimeter wavelengths, ALMA serves as a linear thermometer, mapping narrow layers at different heights. It can measure the thermal structure and dynamics of the solar chromosphere and thus sources and sinks of atmospheric heating. Radio recombination and molecular lines (e.g., CO) potentially provide complementary kinetic and thermal diagnostics, while the polarisation of the continuum intensity and the Zeeman effect can be exploited for valuable chromospheric magnetic field measurements. I will develop the necessary diagnostic tools and use them for solar observations with ALMA. The preparation, optimisation and interpretation of these observations will be supported by state-of-the-art numerical simulations. A key objective is the identification of the dominant physical processes and their contributions to the transport and dissipation of energy. The results will be a major step towards solving the coronal heating problem with general implications for stellar activity.


year authors and title journal last update
List of publications.
2018 M. Stangalini, S. Jafarzadeh, I. Ermolli, R. Erdélyi, D. B. Jess, P. H. Keys, F. Giorgi, M. Murabito, F. Berrilli, D. Del Moro
Propagating Spectropolarimetric Disturbances in a Large Sunspot
published pages: 110, ISSN: 1538-4357, DOI: 10.3847/1538-4357/aaec7b
The Astrophysical Journal 869/2 2019-11-07
2019 Mariarita Murabito, I. Ermolli, F. Giorgi, M. Stangalini, S. L. Guglielmino, S. Jafarzadeh, H. Socas-Navarro, P. Romano, F. Zuccarello
Height Dependence of the Penumbral Fine-scale Structure in the Inner Solar Atmosphere
published pages: 126, ISSN: 1538-4357, DOI: 10.3847/1538-4357/aaf727
The Astrophysical Journal 873/2 2019-11-07
2018 Bastian, T. S.; Bárta, M.; Brajša, R.; Chen, B.; Pontieu, B. D.; Gary, D. E.; Fleishman, G. D.; Hales, A. S.; Iwai, K.; Hudson, H.; Kim, S.; Kobelski, A.; Loukitcheva, M.; Shimojo, M.; Skokić, I.; Wedemeyer, S.; White, S. M.; Yan, Y.
Exploring the Sun with ALMA
published pages: 25-30, ISSN: 0722-6691, DOI:
The Messenger 171 2019-11-07
2019 Juie Shetye, Erwin Verwichte, Marco Stangalini, Philip G. Judge, J. G. Doyle, Tony Arber, Eamon Scullion, Sven Wedemeyer
Multiwavelength High-resolution Observations of Chromospheric Swirls in the Quiet Sun
published pages: 83, ISSN: 1538-4357, DOI: 10.3847/1538-4357/ab2bf9
The Astrophysical Journal 881/1 2019-11-07
2018 A. Nindos, C. E. Alissandrakis, T. S. Bastian, S. Patsourakos, B. De Pontieu, H. Warren, T. Ayres, H. S. Hudson, T. Shimizu, J.-C. Vial, S. Wedemeyer, V. Yurchyshyn
First high-resolution look at the quiet Sun with ALMA at 3mm
published pages: L6, ISSN: 0004-6361, DOI: 10.1051/0004-6361/201834113
Astronomy & Astrophysics 619 2019-11-07
2019 Peter H Keys, Aaron Reid, Mihalis Mathioudakis, Sergiy Shelyag, Vasco M J Henriques, Rebecca L Hewitt, Dario Del Moro, Shahin Jafarzadeh, David B Jess, Marco Stangalini
The magnetic properties of photospheric magnetic bright points with high resolution spectropolarimetry
published pages: , ISSN: 1745-3933, DOI: 10.1093/mnrasl/slz097
Monthly Notices of the Royal Astronomical Society: Letters 2019-11-07
2018 R. Brajša, D. Sudar, A. O. Benz, I. Skokić, M. Bárta, B. De Pontieu, S. Kim, A. Kobelski, M. Kuhar, M. Shimojo, S. Wedemeyer, S. White, P. Yagoubov, Y. Yan
First analysis of solar structures in 1.21 mm full-disc ALMA image of the Sun
published pages: A17, ISSN: 0004-6361, DOI: 10.1051/0004-6361/201730656
Astronomy & Astrophysics 613 2019-06-06
2018 S. Kianfar, S. Jafarzadeh, M. T. Mirtorabi, T. L. Riethmüller
Linear Polarization Features in the Quiet-Sun Photosphere: Structure and Dynamics
published pages: , ISSN: 0038-0938, DOI: 10.1007/s11207-018-1341-2
Solar Physics 293/8 2019-06-06
2018 A. Nindos, C. E. Alissandrakis, T. S. Bastian, S. Patsourakos, B. De Pontieu, H. Warren, T. Ayres, H. S. Hudson, T. Shimizu, J.-C. Vial, S. Wedemeyer, V. Yurchyshyn
First high-resolution look at the quiet Sun with ALMA at 3mm
published pages: L6, ISSN: 0004-6361, DOI: 10.1051/0004-6361/201834113
Astronomy & Astrophysics 619 2019-06-06
2019 Andrew S. Rodger, Nicolas Labrosse, Sven Wedemeyer, Mikolaj Szydlarski, Paulo J. A. Simões, Lyndsay Fletcher
First Spectral Analysis of a Solar Plasma Eruption Using ALMA
published pages: 163, ISSN: 1538-4357, DOI: 10.3847/1538-4357/aafdfb
The Astrophysical Journal 875/2 2019-06-06
2017 L. Rouppe van der Voort, B. De Pontieu, G. B. Scharmer, J. de la Cruz Rodríguez, J. Martínez-Sykora, D. Nóbrega-Siverio, L. J. Guo, S. Jafarzadeh, T. M. D. Pereira, V. H. Hansteen, M. Carlsson, G. Vissers
Intermittent Reconnection and Plasmoids in UV Bursts in the Low Solar Atmosphere
published pages: L6, ISSN: 2041-8213, DOI: 10.3847/2041-8213/aa99dd
The Astrophysical Journal 851/1 2019-06-06

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