Low-Frequency Radio data from Glasgow CALLISTO now included in the RHESSI Browser
Low-Frequency Radio data from the CALLISTO spectrometer located in Glasgow is now included in the quick look images accessed from the RHESSI Browser.
The Glasgow CALLISTO spectrometer detects radio emissions from the Sun between 45-80 MHz from 07:15 UT until 15:00 UT on a daily basis. Quick look images are produced every 15 minutes during the hours of observation and are automatically updated onto the RHESSI Browser, where they can be accessed through the ‘Low-Frequency Radio’ option.
A&A Group welcomes Dr Galina Motorina
Dr Galina Motorina (Researcher from Pulkovo Observatory, Russia) will be visiting us for three weeks.
Her work is on the diagnostics of energy release in the solar corona using X-ray and EUV emissions (Support by the RSF grant No.16-12-10448).
Welcome Xingyao Chen
The triangle symbols indicate the centroids of the fundamental LOFAR source at the frequencies. The background image is SDO/AIA taken from Chen et al, ApJ 2018
Xingyao Chen (National Astronomical Observatories Chinese Academy of Sciences, Beijing) will be visiting us as a PhD scholar for 12 months.
She will be work with the solar radio data from LOFAR and to study the energetic particles responsible for the solar radio emission in solar flares.
European Week of Astronomy and Space Science press release
RAS PR 18/20 (EWASS 16)
Despite their appearance solar tornadoes are not rotating after all, according to a European team of scientists. A new analysis of these gigantic structures, each one several times the size of the Earth, indicates that they may have been misnamed because scientists have so far only been able to observe them using 2-dimensional images. Dr Nicolas Labrosse will present the work, carried out by researchers at the University of Glasgow, Paris Observatory, University of Toulouse, and Czech Academy of Sciences, at the European Week of Astronomy and Space Science (EWASS) in Liverpool on Friday 6 April.
Solar tornadoes were first observed in the early 20th century, and the term was re-popularised a few years ago when scientists looked at movies obtained by the AIA instrument on the NASA Solar Dynamics Observatory (SDO). These show hot plasma in extreme ultraviolet light apparently rotating to form a giant structure taking the shape of a tornado (as we know them on Earth).
Now, using the Doppler effect to add a third dimension to their data, the scientists have been able to measure the speed of the moving plasma, as well as its direction, temperature and density. Using several years’ worth of observations, they were able to build up a more complete picture of the magnetic field structure that supports the plasma, in structures known as prominences.
Dr Nicolas Labrosse, lead scientist in the study, explains: “We found that despite how prominences and tornadoes appear in images, the magnetic field is not vertical, and the plasma mostly moves horizontally along magnetic field lines. However we see tornado-like shapes in the images because of projection effects, where the line of sight information is compressed onto the plane of the sky.”
Dr Arturo López Ariste, another member of the team, adds: “The overall effect is similar to the trail of an aeroplane in our skies: the aeroplane travels horizontally at a fixed height, but we see that the trail starts above our heads and ends up on the horizon. This doesn’t mean that it has crashed!”
Giant solar tornadoes – formally called tornado prominences – have been observed on the Sun for around a hundred years. They are so called because of their striking shape and apparent resemblance to tornadoes on Earth, but that is where the comparison ends.
Whereas terrestrial tornadoes are formed from intense winds and are very mobile, solar tornadoes are instead magnetized gas. They seem to be rooted somewhere further down the solar surface, and so stay fixed in place.
“They are associated with the legs of solar prominences – these are beautiful concentrations of cool plasma in the very hot solar corona that can easily be seen as pink structures during total solar eclipses,” adds Labrosse.
“Perhaps for once the reality is less complicated than what we see!” comments Dr Brigitte Schmieder, another scientist involved in the work.
She continues: “Solar tornadoes sound scary but in fact they normally have no noticeable consequences for us. However, when a tornado prominence erupts, it can cause what’s known as space weather, potentially damaging power, satellite and communication networks on Earth.”
Dr Robert Massey
Royal Astronomical Society
Mob: +44 (0)7802 877 699
Ms Anita Heward
Royal Astronomical Society
Mob: +44 (0)7756 034 243
Dr Morgan Hollis
Royal Astronomical Society
Mob: +44 (0)7802 877 700
Dr Helen Klus
Royal Astronomical Society
Ms Marieke Baan
European Astronomical Society
Dr Nicolas Labrosse
School of Physics and Astronomy
University of Glasgow
Mob: +44 (0)7983 380 380
Dr Brigitte Schmieder
Observatoire de Paris
Tel : +33 (0)1 4507 7817
Dr Arturo López Ariste
Institut de Recherche en Astrophysique et Planétologie
Université de Toulouse
Tel : +33 (0)5 6133 4716
Animation and caption
A solar tornado observed by the NASA satellite SDO between 23 April and 29 April 2015. The tornado prominence erupted on 28 April. An image of the Earth is superimposed for scale.
Credit: SDO data courtesy of NASA. Movie created using the ESA and NASA funded Helioviewer Project.
Images and captions
Composite image of the prominence observed on 15 July 2014 showing, after co-alignment: the EIS raster in green, the IRIS slit-jaw image in red, and an SOT image in blue. The white contours show the THEMIS D3 intensity image and indicate where the tornadoes are observed in extreme ultraviolet. The background image is an AIA 304 angstrom image (greyscale).
Credit: P. Levens
Composite image of an erupting solar prominence observed by SDO on 31 August 2012.
Credit: NASA / SDO / GSFC
Dr Nicolas Labrosse will be giving an outreach talk on this topic at the Merseyside Astronomy Day (MAD) on Saturday 7 April. Full details can be found at: http://www.astro.ljmu.ac.uk/mad/labrosse.html
The full team consists of:
Dr Nicolas Labrosse, SUPA, School of Physics and Astronomy, University of Glasgow, UK
Dr Peter Levens, SUPA, School of Physics and Astronomy, University of Glasgow, UK
Dr Arturo López Ariste, Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse, CNRS, CNES, France
Dr Brigitte Schmieder, LESIA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, Univ. Paris-Diderot, Sorbonne Paris Cité, Meudon, France
Dr Maciej Zapiór, Astronomical Institute, Academy of Sciences of the Czech Republic, Ondřejov, Czech Republic
Details of the techniques used to obtain these results can be found in the following publications:
B. Schmieder, M. Zapior, A. Lopez Ariste, P. Levens, N. Labrosse, R. Gravet, “Reconstruction of a helical prominence in 3D from IRIS spectra and images”; A&A, 606, A30 (2017)
B. Schmieder, P. Mein, N. Mein, P. Levens, A. Lopez Ariste, N. Labrosse, L. Ofman, “H alpha Doppler shifts in a tornado in the solar corona”; A&A, 597, 109 (2017)
P. Levens, B. Schmieder, N. Labrosse, A. Lopez Ariste, “Structure of prominence legs: plasma and magnetic fields”; ApJ, 818, 31 (2016)
P. Levens, B. Schmieder, A. Lopez Ariste, N. Labrosse, K. Dalmasse, B. Gelly, “Magnetic field in atypical prominences: Bubble, tornado and eruption”; ApJ, 826, 164 (2016)
P. Levens, N. Labrosse, B. Schmieder, A. Lopez Ariste, L. Fletcher, “Comparison between UV/EUV line parameters and magnetic field parameters in a quiescent prominence with tornadoes”; A&A, 607, A16 (2017)
Notes for editors
The European Week of Astronomy and Space Science (EWASS 2018) will take place at the Arena and Conference Centre (ACC) in Liverpool from 3 – 6 April 2018. Bringing together around 1500 astronomers and space scientists, the conference is the largest professional astronomy and space science event in the UK for a decade and will see leading researchers from around the world presenting their latest work.
EWASS 2018 is a joint meeting of the European Astronomical Society and the Royal Astronomical Society. It incorporates the RAS National Astronomy Meeting (NAM), and includes the annual meeting of the UK Solar Physics (UKSP) group. The conference is principally sponsored by the Royal Astronomical Society (RAS), the Science and Technology Facilities Council (STFC) and Liverpool John Moores University (LJMU).
Liverpool John Moores University (LJMU) is one of the largest, most dynamic and forward-thinking universities in the UK, with a vibrant community of 25,000 students from over 100 countries world-wide, 2,500 staff and 250 degree courses. LJMU celebrated its 25th anniversary of becoming a university in 2017 and has launched a new five-year vision built around four key ‘pillars’ to deliver excellence in education; impactful research and scholarship; enhanced civic and global engagement; and an outstanding student experience.
The Royal Astronomical Society (RAS), founded in 1820, encourages and promotes the study of astronomy, solar-system science, geophysics and closely related branches of science. The RAS organizes scientific meetings, publishes international research and review journals, recognizes outstanding achievements by the award of medals and prizes, maintains an extensive library, supports education through grants and outreach activities and represents UK astronomy nationally and internationally. Its more than 4000 members (Fellows), a third based overseas, include scientific researchers in universities, observatories and laboratories as well as historians of astronomy and others.
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Congratulations to Dr Alcock
Ben Alcock with thesis entitled “Solar Electron and Radio Wave Propagation in the Turbulent Solar Corona” successfully passed his viva on Thursday March 22.
A part part of the thesis was published and another part is in preparation for publication.
Funded PhD in Solar X-ray Physics
A fully funded PhD studentship for a UK/EU student is available at the University of Glasgow in Solar X-ray Physics.
The project is funded by the Royal Society and is titled “The high energy emission from small solar flares”. This will involve using some of the latest solar X-ray data (including NASA’s NuSTAR telescope) to investigate heating of the solar atmosphere. The primary supervisor will be Dr. Iain Hannah within the Astronomy & Astrophysics group in the SUPA School of Physics and Astronomy at the University of Glasgow, UK.
The PhD studentship will start by 1st October 2018, and has funding up to 4 years covering the fees (of a UK or EU student), annual stipend (currently about £14.5K), as well as travel support.
Applicants should have (by the start date) at least a second class degree (or equivalent) in a relevant subject and ideally some experience of solar (or astronomical) data analysis – coding in IDL, SolarSoft and/or Python.
A&A’s Dr. Ryan Milligan stars in his own TV show this week, all about two of his passions – astronomy and trucks.
The programme follows Ryan driving a truck, hauling the supercomputer for the radio telescope i-LOFAR from the Netherlands to Birr in Ireland.
It was broadcast on BBC Northern Ireland on Monday 4th December, and you can catchup with our very own EIS Road Trucker on iPlayer.
Award from China arrived to Hamish Reid and Heather Ratcliffe
The mini-volume published in RAA journal presented research papers based on talks at the 1st RadioSun workshop in China. The RadioSun network links research teams from China, Czech Republic, Poland, Russia and the UK. The paper by Hamish Reid and Heather Ratcliffe won a RAA Excellent Paper award.
Congratulations to Dr Motorina
Some of the Glasgow solar PhD students (Paul Wright, Stephen Brown, Galina Motorina) broadcasting live with STV’s Sean Batty during the eclipse
In the PhysicsCentral article, “Small-Scale Turbulence May Help Power Solar Explosions” the complex physics about role of turbulence in solar flares is explained using simple terms. The Glasgow-led research team spread over 13 time zones represents six languages, five solar instruments, and various areas of expertise on the Sun’s activity.
With PhysicsCentral, the American Physical Society communicates the excitement and importance of physics to everyone.
European Solar Physics Meeting highlights group research
First IR flare observed at 8 microns, showing two IR sources near a sunspot.
Research led by Dr. Paulo Simoes has been featured as a research highlight in a press release from the 15th European Solar Physics meeting, held recently in Hungary. Paulo’s work uses numerical simulations to predict the behaviour of chromospheric flare emission in the infrared continuum, and understand how it can be used to track the evolution of chromospheric ionisation. Armed with this new knowledge, new observations with the Daniel K. Inouye Solar Telescope will be proposed.
Dr. Eduard Kontar is elected as ESPD president
We congratulate A&A’s Dr. Eduard Kontar. He was elected president of the European Solar Physics Division (ESPD) of the European Physical Society (EPS) during the elections at the European Solar Physics Meeting (ESPM) in Budapest last week.
Dr. Eduard Kontar is also currently president of CESRA (Community of European Solar Radio Astronomers).
Well done from the group!
The ESPD is a division of the European Physical Society that represents and provides a forum for scientists interested in the physics of the Sun.
Poster prize for Paul Wright
Paul Wright (right) receiving the 2017 AAS Solar Physics Division Student Poster Prize at the 48th AAS/SPD meeting in Portland, OR.
Paul (and Stephen Brown) received an SPD Studentship to attend the meeting.
Early Career Prize to Dr. Natasha Jeffrey
We’re delighted that the EPS Solar Physics Division chose to award its first-ever 2017 ESPD Early Career Prize to Dr. Natasha Jeffrey “for significant contributions to the physics of solar flares and for inspiring outreach activities”.
The ceremony was attended by the Astronomer for Scotland, Professor John C Brown OBE FRSE, University Principal and Vice-Chancellor, Professor Anton Muscatelli, former Reader and Director of University’s observatory, Dr. David Clarke FInstP as well as a descendant of Wilson, James Babington Smith. The event also saw presentations and display of material for the University’s Hunterian museum and National Museums of Scotland. The blue plaque will be permanently mounted at the entrance of the University’s observatory at Acre Rd.
Congratulations to Graham Kerr and Duncan Stackhouse!
Graham Kerr with thesis “Observations and Modelling of the Chromosphere During Solar Flares” and Duncan Stackhouse with thesis “The Acceleration and Transport of Electron Populations in Solar Flares” successfully passed their vivas.
Alliance Meeting on energetic particles, December 7-8, 2016
Alliance Meeting on energetic particles in solar flares [webpage] , contact Nic Bian regarding the meeting.
CESRA website moves from Paris to Glasgow
Glasgow now hosts the CESRA (Community of European Solar Radio Astronomers) website thanks to Kenzie Nimmo and Norman Gray. The recent solar radio (and other) science highlights can be followed, discussed and shared on Twitter and Facebook.
Congrats to Prof John Brown OBE
Congratulations to the A&A group’s Professor John Brown (former Regius Professor of Astronomy and currently Astronomer Royal for Scotland) who has been awarded an OBE in the Queen’s Birthday Honours List “for services to the promotion of astronomy and science education”.
PhD studentship in solar radio physics
Coronal Mass Ejection and radio source imaged by LOFAR and SDO (see details here)
Afully funded PhD studentship is available in the area of Solar Radio Physics at the University of Glasgow. It is a joint UK-Franco project supported by Direction Générale de l’Armement (DGA) and Defence Science and Technology Laboratory (Dstl). The successful candidate will be based in Glasgow in the Astronomy & Astrophysics group (http://www.astro.gla.ac.uk) and theywill closely collaborate with Paris Observatory, Meudon. The PhD student will work with imaging and spectroscopic data from the Low Frequency Array (LOFAR), developing simulations to establish more detailed links between radio transient phenomena and the fine structures in radio burst spectra.
The student should have a minimum of a 2.1 honours degree or higher in a relevant discipline and should be a UK or French National. The anticipated start date is 1st October 2016. Interested candidates should email Dr Kontar.
Giant solar radio source
In the outer solar corona, the radio observations provide the unique link between near-Sun phenomena and the effects of solar activity that extend throughout the heliosphere. ‘RadioSun‘ sponsored researchers use Low Frequency Array (LOFAR) radio images to study giant radio source associated with a Coronal Mass Ejection.
European Physical Society thesis prize goes to Dr Natasha Jeffrey
Peter Levens, a PhD student in the Astronomy and Astrophysics Group, has won the School of Physics and Astronomy’s Thomson Prize for his second year report on Solar Tornadoes in Prominences.
Well done Peter!
Differential Emission Measure (left) and Emission Measure Distribution (right) for a location in the solar tornado. From Levens et al (2015) A solar tornado observed by EIS: plasma diagnostics. Astronomy and Astrophysics, 582, A27. (doi:10.1051/0004-6361/201425586)