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A new perspective on particle acceleration on the Sun: Solar flare radio observations with the Karl G. Jansky Very Large Array

Applicant Battaglia Marina
Number 175832
Funding scheme Project funding (Div. I-III)
Research institution Fachhochschule Nordwestschweiz Hochschule für Technik
Institution of higher education University of Applied Sciences and Arts Northwestern Switzerland (without UTE) - FHNW
Main discipline Astronomy, Astrophysics and Space Sciences
Start/End 01.10.2018 - 30.09.2021
Approved amount 342'900.00
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Keywords (6)

Sun: X-rays; plasmas; Sun: radio radiation; acceleration of particles; Sun: flares; solar physics

Lay Summary (German)

Lead
Radiostrahlung von Sonneneruptionen liefert wertvolle Informationen über die Herkunft und Propagation von beschleunigten Elektronen. Mit dem Karl G. Jansky Very Large Array ist es zum ersten Mal möglich, die Beschleunigungsregion selber zu beobachten und die Trajektorie von beschleunigten Elektronen nachzuvollziehen.
Lay summary

Inhalt und Ziel des Forschungsprojekts
Ziel dieses Projekts ist ein besseres Verständnis davon, wo und wie Elektronen in Sonneneruptionen beschleunigt werden und wie sie in der Folge von der Sonne weg transportiert werden. Dafür werden in einem ersten Schritt Beobachtungen von einzelnen Sonneneruptionen im Detail ausgewertet. In einem zweiten Schritt wird systematisch eine grössere Anzahl von Eruptionen analysiert. Basis für die Studie sind Radiodaten des Karl G. Jansky Very Large Array, ergänzt mit Beobachtungen von Weltraumsatelliten wie RHESSI und SDO in anderen Wellenlängen.

 

Wissenschaftlicher und gesellschaftlicher Kontext des Forschungsprojekts
Sonneneruptionen haben weitreichende Auswirkungen auf die Erde in Form von geomagnetischen Störungen. Diese Arbeit wird neue Erkenntnisse zur Ursache und zum Ablauf von Sonneneruptionen liefern und somit zu ihrem besserem Verständnis und besserer Vorhersagbarkeit beitragen

Direct link to Lay Summary Last update: 01.03.2018

Responsible applicant and co-applicants

Employees

Name Institute

Project partner

Publications

Publication
The active region source of a type III radio storm observed by Parker Solar Probe during encounter 2
Harra L., Brooks D. H., Bale S. D., Mandrini C. H., Barczynski K., Sharma R., Badman S. T., Vargas Domínguez S., Pulupa M. (2021), The active region source of a type III radio storm observed by Parker Solar Probe during encounter 2, in Astronomy & Astrophysics, 650, A7-A7.
Radio and X-Ray Observations of Short-lived Episodes of Electron Acceleration in a Solar Microflare
Sharma Rohit, Battaglia Marina, Luo Yingjie, Chen Bin, Yu Sijie (2020), Radio and X-Ray Observations of Short-lived Episodes of Electron Acceleration in a Solar Microflare, in The Astrophysical Journal, 904(2), 94-94.
Propagation Effects in Quiet Sun Observations at Meter Wavelengths
Sharma Rohit, Oberoi Divya (2020), Propagation Effects in Quiet Sun Observations at Meter Wavelengths, in The Astrophysical Journal, 903(2), 126-126.
Study of the spatial association between an active region jet and a nonthermal type III radio burst
Mulay Sargam M., Sharma Rohit, Valori Gherardo, Vásquez Alberto M., Del Zanna Giulio, Mason Helen, Oberoi Divya (2019), Study of the spatial association between an active region jet and a nonthermal type III radio burst, in Astronomy & Astrophysics, 632, A108-A108.
Multiple electron acceleration instances during a series of solar microflares observed simultaneously at X-rays and microwaves
Battaglia Marina, Multiple electron acceleration instances during a series of solar microflares observed simultaneously at X-rays and microwaves, in The Astrophysical Journal .

Collaboration

Group / person Country
Types of collaboration
Divya Oberoi, NCRA/TFR India (Asia)
- Publication
Louise Harra, PMOD/WRC Switzerland (Europe)
- Publication

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
STELLAR Seminar, Bulgarian Academy of Sciences Individual talk Characterisation of weak transient meterwave solar emissions 16.09.2021 Sofia , Bulgaria Sharma Rohit;
Swiss SKA days Talk given at a conference Solar Science using the Square Kilometre Array 07.09.2021 Lausanne, Switzerland Sharma Rohit;
16th European Solar Physics Meeting Poster Microwave Oscillations in a solar flares 06.09.2021 online , Italy Sharma Rohit;
RHESSI-20 Workshop: Preparing for the Next Decade in High-Energy Solar Physics Research Talk given at a conference Radio and X-ray observations of electron acceleration in a series of solar microflares 06.07.2021 online , Italy Battaglia Marina;
MWA Virtual Meeting Talk given at a conference Imaging of weak impulsive solar emissions using residual visibilities 22.06.2021 online , Australia Sharma Rohit;
238th meeting of the American Astronomical Society Talk given at a conference Observations of Multiple Electron Acceleration Events in a Series of Solar Microflares 07.06.2021 online , United States of America Battaglia Marina;
SolFER Spring 2021 Meeting Talk given at a conference Multi-wavelength observations of electron energization in solar flares 24.05.2021 online , United States of America Battaglia Marina;
EGU 2021 Talk given at a conference Radio and X-ray observations of Short-lived Episodes of Electron Acceleration in a Solar Microflare 19.04.2021 online , Austria Sharma Rohit;
UMD Plasma Physics Seminar Individual talk A multi-wavelength view on electron acceleration in solar flares 24.03.2021 online , United States of America Battaglia Marina;
AGU Fall Meeting 2020 Talk given at a conference An X-ray view on electron acceleration and transport in solar flars 01.12.2020 online , United States of America Battaglia Marina;
AGU Fall Meeting 2020 Poster Radio and X-ray Observation of Short-lived Episodes of Electron acceleration in a Solar microflare 01.12.2020 online , United States of America Sharma Rohit;
A&A Seminar, University of Glasgow Individual talk Fine variations in quiet Sun emission at meterwaves 12.11.2020 online , Great Britain and Northern Ireland Sharma Rohit;
MWA Virtual Meeting Talk given at a conference Probing fine spatial, temporal and spectral structures of the Sun 16.06.2020 online , Australia Sharma Rohit;
AGU Fall Meeting 2019 Poster Probing fine spatial, temporal and spectral structures of the extremely quiet Sun 09.12.2019 San Francisco, United States of America Sharma Rohit;
SWRL seminar, NJIT Individual talk Role of Scattering in Quiet Sun at Meterwavelengths 05.12.2019 Newark , United States of America Sharma Rohit;
Ioffe Workshop on GRBs and other transient sources: 25 Years of Konus-Wind Experiment Talk given at a conference X-ray view on solar flare accelerated electrons 09.09.2019 St.Petersburg, Russia Battaglia Marina;
CESRA Meeting XVII Talk given at a conference Study of Quiet Sun Low Frequency using MWA 08.07.2019 Potsdam , Germany Sharma Rohit;
RHESSI-18 Workshop High-Energy Solar Physics: Building on the RHESSI Legacy Talk given at a conference Study of the Particle Acceleration in a Weak Solar Flare using JVLA 28.05.2019 Minnesota , United States of America Sharma Rohit;
RHESSI-18 Workshop High-Energy Solar Physics: Building on the RHESSI Legacy Talk given at a conference Study of the Particle Acceleration in a Weak Solar Flare using JVLA 28.05.2019 Minnesota , United States of America Sharma Rohit;
RHESSI-18 Workshop High-Energy Solar Physics: Building on the RHESSI Legacy Talk given at a conference A series of microflares observed with RHESSI and the VLA 28.05.2019 Minnesota , United States of America Battaglia Marina;
URSI Asia Pacific Radio Conference Talk given at a conference Study of Praticle Acceleration in a weak Solar Flare 09.03.2019 New Delhi , India Sharma Rohit;
SWRL Seminar, NJIT Individual talk Characterizing low-frequency emission from using MWA 11.11.2018 Newark , United States of America Sharma Rohit;


Knowledge transfer events

Active participation

Title Type of contribution Date Place Persons involved
Swiss Space Days 2020 Talk 09.11.2020 online , Switzerland Battaglia Marina;


Communication with the public

Communication Title Media Place Year
Talks/events/exhibitions Mysterious relationship of the Sun and the Earth International 2020
Talks/events/exhibitions Wie wird das Weltraumwetter morgen? Sonnenaktivität und ihre Auswirkungen German-speaking Switzerland 2019
Talks/events/exhibitions Sonne, Weltraumwetter & Solar Orbiter German-speaking Switzerland 2018

Use-inspired outputs

Abstract

Solar eruptive events, in particular solar flares and the often associated coronal mass ejections allow us to study fundamental processes in magnetized plasmas such as magnetic energy release, particle acceleration, and particle transport. These are ubiquitous in the Universe and at the core of many plasma physics applications. At the same time, solar eruptions are the drivers of space weather. As such they are responsible for occasional disruptions of technical systems on the ground and are a potential danger to human space activities. With this project we will study the fundamental processes of particle acceleration and transport in solar flares using unprecedented radio observations from the Karl G. Jansky Very Large Array (VLA) in combination with multi-wavelength context observations from solar space-borne observatories. With the VLA we have, for the first time, the means to make images at superior spectral resolution and make spatially resolved spectra of flare-related radio emission. This presents a unique opportunity to explore a new field of research from its beginning.During the three-year duration of this project, the first two years will be dedicated to studying electron acceleration in flare-related jets and their significance for the solar wind. Since solar flares are very heterogeneous and complex, this will be done both as case-by-case study of specially selected events and, subsequently, as a larger statistical study over many events. During year three, we will work toward understanding the primary acceleration region and acceleration mechanism by studying radio bursts from within the acceleration region. The proposed work will make use of already existing, but not yet analyzed, VLA observations of solar flares. Additionally, starting in the first year of the project I will also plan and apply for additional observing time with the VLA with the goal of having observations approved and scheduled in year three to guarantee continuity beyond the current project.Due to the novel and largely unexplored nature of solar VLA observations, the proposed work is expected to make major contributions to our current understanding of particle acceleration and transport in solar flares and how they affect space weather, and to also stimulate fundamental plasma physics research. As a result it will lay the foundations for a strong and continued involvement of the Swiss Heliophysics community in radio observations of solar eruptions, in particular in view of and in preparation for upcoming missions such as ESA’s Solar Orbiter (launch in 2018), and it will establish FHNW as a key player in the growing field of solar radio imaging spectroscopy.
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