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BOOTES-6 telescope station
The BOOTES-6 telescope station captured a South African sighting of the southern lights, a rare atmospheric phenomenon powered by solar activity.

The northern lights, with their vibrant displays of green, pink, and violet hues, have become a famous attraction in Nordic countries. But in early October, a rare sighting of the southern lights – or aurora australis – was reported in South Africa, surprising many.

Prof Pieter Meintjes, Professor in the Department of Physics at the University of the Free State (UFS), explains that both the northern and southern lights are the result of charged particles from coronal mass ejections (CMEs) on the sun, which are captured by Earth’s magnetic field. "The interaction between magnetic fields and charged particles, such as protons and electrons, is very interesting. The magnetic field forces these particles to spiral around the field lines, ultimately guiding them towards the magnetic poles. As these particles enter Earth’s atmosphere, they collide with atmospheric atoms, causing a beautiful glow. The colours of the aurora indicate which atoms are involved. Typically, hydrogen shines red, while oxygen and nitrogen produce a greenish-blue tinge," he says.

Observing the southern lights

When the display occurs above the northern magnetic pole, it is called the aurora borealis (northern lights) and can typically be observed over regions such as Alaska, Greenland, and the Nordic countries. Above the southern magnetic pole, it is known as aurora australis (southern lights), usually visible over places such as Antarctica and New Zealand. “In extreme cases – when gigantic mass ejections occurred – it can also be observed in mid-latitudes such as South Africa,” says Prof Meintjes.

This recent and rare South African sighting was also captured by the BOOTES-6 telescope station at Boyden Observatory, located just outside Bloemfontein. According to Prof Meintjes, the telescope station has an all-sky monitor – a camera constantly watching the sky for changes and monitoring, among others, cloud cover to ensure that the telescope is always safe from weather. While the monitor was taking photos of the night sky, Prof Alberto Castro-Tirado, a research professor at the Institute of Astrophysics of Andalusia in Spain, picked up the aurora.

The Institute of Astrophysics of Andalusia in Spain, in collaboration with the University College Dublin (UCD), is partnering with the UFS in a research-driven initiative involving the BOOTES-6 telescope station, installed in 2022 during the COVID-19 pandemic. Under a Memorandum of Understanding that was recently renewed for another five years, the UFS and UCD share approximately 30% of the telescope's observing time dedicated to UFS research.

“The DPRT telescope (Dolores Pérez-Ramírez telescope), named after a Spanish astronomer and lecturer at the University of Jaén, contributes significantly to our research, with publications resulting from contributions made by the telescope station and collaborators on gamma-ray bursts, occultations, and transient events co-authored by me and a colleague in the department, Dr Hendrik van Heerden,” notes Prof Meintjes.

Research-driven initiatives

Data from the telescope station is also used for their in-house projects and contributes significantly to the work of their PhD students that will be submitted in the next few years. This includes the PhD work of Helene Szegedi, who uses data from the BOOTES-6 telescope station to study cataclysmic variable systems – compact binaries that erupt regularly. Another PhD student, Joleen Barnard, studies blazar variability under the guidance of Prof Brian van Soelen. Blazars, explains Prof Meintjes, are the core of distant galaxies powered by supermassive black holes. These cosmic jets are pointed towards Earth, but fortunately, they are millions or billions of light years away; otherwise, their impact would be devastating to life on Earth.

News Archive

Curtains fall on Darwin lecture series
2010-02-03

The University of the Free State (UFS), in collaboration with the Central University of Technology and the National Museum in Bloemfontein, will host the final lecture of the Charles Darwin lecture series entitled "The story of life and survival" as part of the 200-years celebration of Charles Darwin’s birthday on Thursday, 11 February 2010.

The lecture titled Trends in evolution and their bearing on the future of humankind will be presented by Prof. Bruce Rubidge and Prof. Terence McCarthy from the University of the Witwatersrand and co-authors of the book The Story of Earth and Life.

Last year, when the year-long lecture series started, several lectures were presented by academics from various departments at the UFS.
Prof. Marian Tredoux and Mr Johan Loock from the Department of Geology presented lectures on The origin of our solar system and The geological evolution of our planet: the first billion years, respectively.

"Transitions and extinctions" was the topic of another lecture presented by Dr Jennifer Botha-Brink, a paleontologist at the National Museum and affiliated to the Department of Zoology and Entomology at the UFS. She discussed the causes of mass extinctions and their effects on the world's organisms.

The Department of Genetics also made their contribution to this lecture series in the form of two lectures on the genetic foundation of evolution presented by the Head of the Department, Prof. Johan Spies and Prof. Paul Grobler, an Associate Professor in the Department.

Next followed lectures on the evolution of the information and communication technology that were presented by the Departments of Communication Science, Chemistry, Physics, and Computer Science and Informatics, which focused on communication in a manufacturing environment, the knowledge explosion and the broadband universe.

This final lecture of the series will be presented in the CR Swart Auditorium on the UFS Main Campus at 18:00. Limited seats are available and bookings can be made by contacting Ms Isabel Human at humanci@ufs.ac.za or 051 401 2427 before or on Monday, 8 February 2010.

Media Release:
Mangaliso Radebe
Assistant Director: Media Liaison
Tel: 051 401 2828
Cell: 078 460 3320
E-mail: radebemt@ufs.ac.za  
2 February 2010

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