Here Comes The Sun

Canadian Mission RADICALS (RADiation Impacts on Climate and Atmospheric Loss Satellite) to Study Extreme Solar Events and Their Ramifications

By Maria Volosatov

X2.1 solar flare from 11:03 am on Oct. 25, 2013. Blend of SDO AIA 193 and 131., 25 October 2013, NASA’S Goddard Space Flight Center / SDO. Courtesy of Wikimedia Commons. 

On September 1st, 1859, English amateur astronomer Richard Christopher Carrington witnessed an event he believed to be “exceedingly rare.” Carrying out observations of sunspots by projecting an image of the solar disk on a plate of coated glass, Carrington busied himself with his usual meticulousness by recording the time read by his chronometer, when “[t]wo patches of intensely bright and white light broke out” [1]. After assuring himself it was not some fluke of his apparatus, he hastened to convene with another fellow amateur astronomer, one Richard Hodgson, who was also fortunate to independently witness the event. “I have carefully avoided exchanging any information with that gentleman, that any value which the accounts may possess may be increased by their independence” [1]. The Monthly Notices of the Royal Astronomical Society published the two astronomers’ reports and diagrams side by side the following November.

 Those familiar with the story, or at least the name, may recognize what exactly the two had observed on that day. In the following 17 hours, a massive auroral display was witnessed all over the world. Newspaper excerpts all over North America received accounts of the fantastic display, “The whole sky appeared to undulate something like a field of grain in a high wind… [n]othing could exceed the grandeur and beauty of the sight” was recorded in the San Francisco Herald, on September 5th, three days after the great solar storm. Newspapers could be read in the dead of night by the light of the aurora, and campers in the Rocky Mountains awoke in the night and began preparing breakfast [2]. Lest one get caught up in the poetics of this event, this occurrence caused a major failure of telegraph systems from North America to Australia. The geomagnetically induced current quite literally fried telegraph poles [3].

The Carrington Event, as it became known, was no singular case, nor one we might hope to never reoccur. Our reliance on the electrical grid would make another such event a natural catastrophe of unsurpassed impact. In fact, we are not as removed from such an event as we might believe; the March 1989 failure of the Hydro-Québec grid was caused by a solar magnetic storm [4]. The province remained without power for nine hours, until service restoration was complete. The event triggering this outage was three times smaller in magnitude than the Carrington Event.

The study of space weather, or heliophysics as they impact the Earth’s atmosphere and magnetosphere, is therefore quite consequential to our understanding and anticipation of these violent outbursts. Coronal mass ejections (CMEs) put our magnetosphere to the test, stretching and compressing it, causing the very same geomagnetic storms that are capable of disrupting power grids. In tandem with solar flares and solar winds, the dual-shield natural “defense system” of the Earth—the magnetosphere and the atmosphere—endures these events and is largely successful in deflecting, absorbing, and re-emitting incoming high-energy particles [5].

Quantifying the influx of energetic particles and the rate of their entry into the atmosphere is a task which puts our understanding beyond hand-waving, qualitative descriptions. And that is precisely what the RADiation Impacts on Climate and Atmospheric Loss Satellite (RADICALS) Mission hopes to achieve. A collaboration in the works since 2019 between Canadian universities has finally secured the funding necessary to launch a CUBE satellite in 2026. With a $20.3 million cost of operations budget, the RADICALS mission hopes to gather data that may revolutionise our understanding of the interactions between space weather and our planet [6].

This satellite will boast an impressive array of instrumentation. The X-ray Imager (XRI), designed and built at the University of Calgary, will measure these energetic particles as they are precipitated into the Earth’s atmosphere. Magnetometers designed by the University of Alberta will provide the direction of the background magnetic fields and the magnetic signature of incoming plasma waves. In addition to the magnetometers, UoA also took on the design of particle detectors sensitive to particles in the keV-MeV energy range [6][7].

Jumping on the modern satellite bandwagon by using a CubeSat, the main body of the satellite will be made by the University of Toronto. The total mass of 50-60 kg makes this spacecraft a microsatellite. The miniaturised body and significantly reduced cost of fabrication make the CubeSat a gamechanger in the feasibility of conducting similar experiments with smaller budgets [8]. Countries that do not have a significant budget for space exploration have been able to launch their first satellites thanks to these nanosatellites. Student groups and academic collaboration projects like RADICALS are now capable of testing their experiments in the environment for which they are designed [9].

 The shift in our understanding of heliophysics cannot be understated. We have gone from observing the solar disk on a coated plate to highly sophisticated instruments capable of quantifying the influx of particles across the electromagnetic spectrum. Yet our preparation for another Carrington event, or even a Miyake event [10], is largely agreed to be at roughly the same level–rather low. University of Alberta astrophysics professor Dr. Ian Mann, who is on the RADICALS science team, remarked in an interview with Western Wheel that “[w]e need to better comprehend how these climate pieces fit together, and that must include how the space weather piece fits into dynamics in the atmosphere” [11]. The RADICALS mission is not only an endeavour to bridge the gap in our understanding, but a limelight on the critical necessity to predict and be ready for the next Carrington event.

Acknowledgement: I would like to thank CSA and UN COPUOUS alumnos and International Space University professor emeritus Dr. David Kendall for sharing an article on the RADICALS mission with me, and for his continued support as a mentor of the SEDS mentorship program.

Sources & Additional Reading

[1]  Carrington, R.C. (1859, November). Description of a Singular Appearance seen in the Sun on September 1, 1859. Monthly Notices of the Royal Astronomical Society, Vol. 20, p. 13-15 https://articles.adsabs.harvard.edu/full/1859MNRAS..20…13C/0000014.000.html/

[2]  Boardsen, S., Green, James L., Humble, J., Odenwald, S., Pazamickas, K.P., (2005, August 5). Eyewitness Reports of The Great Auroral Storm of 1859. Advances in Space Research, p. 15-16  https://ntrs.nasa.gov/api/citations/20050210157/downloads/20050210157.pdf

[3]  Boardsen, S., Green, James L., Humble, J., Odenwald, S., Pazamickas, K.P., (2005, August 5). Eyewitness Reports of The Great Auroral Storm of 1859. Advances in Space Research, p. 8 The Sydney Morning Herald (1859, August 30) https://ntrs.nasa.gov/api/citations/20050210157/downloads/20050210157.pdf

[4]  “Understanding Electricity | March 1989 Blackout | Hydro Québec”, Hydro Québec website. http://www.hydroquebec.com/learning/notions-de-base/tempete-mars-1989.html

[5]  Eddy, John A. (2009, July) “The Sun, The Earth, and Near-Earth Space : A guide to the Sun-Earth System”. National Aeronautics and Space Administration. https://lwstrt.gsfc.nasa.gov/images/pdf/john_eddy/SES_Book_Interactive.pdf

[6]  Mann, I., Cully, C., Fedosejevs, R., Zee, R., Millings, D., Rankin, R., Connors, M., McWilliams, K., Ward, W., Fiori, R., Olifer, L., Ozeke, L., Yau, A., Howarth, A., Lipsett, M. (2021, December). The RADiation Impacts on Climate and Atmospheric Loss Satellite (RADICALS) Mission. AGU Fall Meeting 2021, New Orleans, LA., 13-17 December 2021. https://ui.adsabs.harvard.edu/abs/2021AGUFMSM24A..10M/abstract

[7]  Goodman, Liana. (2021, August 4) “UCalgary to build instrumentation for the RADICALS mission” https://www.ucalgary.ca/aerospace/UCalgary-to-build-instrumentation-for-the-RADICALS-mission

[8]  Caldwell, S., Dunbar, B., (2023, August 23). “What are SmallSats and CubeSats?”. National Aeronautics and Space Administration. https://www.nasa.gov/what-are-smallsats-and-cubesats/#:~:text=CubeSats%20are%20a%20class%20of%20nano%2D%20and%20microsatellites%20that%20use,in%20development%20or%20awaiting%20launch

[9]  Kulu, Eric. Nanosats Database (access 2023 December 2). World map (Figures). https://www.nanosats.eu/#figures

[10]  Miyake, F., Nagaya, K., Masuda, K., Nakamura, T. (2012 June). A signature of cosmic-ray increase in AD 774-775 from tree rings in Japan. Nature. https://www.nature.com/articles/nature11123

[11]  Ducatel, Simon (2023, July). “New made-in-Canada space mission to study severe solar weather”. Western Wheel. https://www.westernwheel.ca/beyond-local/new-made-in-canada-space-mission-to-study-severe-solar-weather-7291345

[12] Image Source : X2.1 flare from 11:03 am on Oct. 25, 2013. Blend of SDO AIA 193 and 131., 25 October 2013, NASA’S Goddard Space Flight Center / SDO, https://commons.wikimedia.org/wiki/File:X2.1_flare_from_11.03_am_on_Oct._25,_2013._Blend_of_SDO_AIA_171_and_131.jpg 

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