Solar storm detected in deep sea observatories
News Release
May 15, 2024

The powerful solar storm driving the aurora borealis over global skies last weekend was also triggering the movement of compasses deep in the ocean, as revealed in new scientific findings shared today by Ocean Networks Canada (ONC), a University of Victoria initiative.

ONC’s subsea observatories on the west and east coasts of Canada recorded the temporary distortion of the Earth’s magnetic field on instrument platforms deployed as deep as 2.7 kilometres under the ocean surface, potentially some of the most remote recordings ever captured.

NASA’s Solar Dynamics Observatory captured this image of an X5.8 solar flare peaking at 9:23 pm EDT on May 10, 2024. The image shows SDO's 193 channel, a subset of extreme ultraviolet light. Credit: NASA/SDO

The most significant magnetic shift moved the direction of the compass within a range of +30 to -30 degrees and was recorded at a depth of 25 metres at the Folger Passage subsea site, which is part of the ONC NEPTUNE cabled observatory off the coast of Vancouver Island.

Geomagnetic disturbances can pose risks to power grids, satellite networks, and navigation systems as well as impact animals’ own navigational abilities.

“The reach of these data recordings kilometres under the ocean surface highlight the magnitude of the solar flare over the past weekend and suggest that the data may be useful for better understanding the geographic extent and intensity of these storms,” says Kate Moran, ONC president and chief executive officer.

Compass data captured by ONC’s major cabled subsea observatories VENUS and NEPTUNE off Vancouver Island, at Burrard Inlet on the Pacific Coast, and at Conception Bay on the Atlantic coast shows the magnetic field distortion occurring during a solar storm from May 10-12 (UTC), 2024.

The discovery of these solar storm magnetic disturbances happened during data quality control checks. ONC primarily uses compasses to orient its Acoustic Doppler Current Profilers (ADCP) instruments which measure ocean currents.

Alex Slonimer, a scientific data specialist at ONC, was completing a daily check on the data in late March when he first noticed an anomaly in the numbers showing up in the Ocean 3.0 Data Portal.

“I looked into whether it was potentially an earthquake, but that didn't make a lot of sense because the changes in the data were lasting for too long and concurrently at different locations,” Slonimer explains. “Then, I looked into whether it was a solar flare as the sun has been active recently.”

This past weekend’s much larger solar storm event reinforced the observation, he adds, with the peaks in the compass headings closely correlated to the peaks in the visible activity in the aurora.

Justin Albert, professor of physics with UVic’s Department of Physics and Astronomy, welcomes the new subsea geomagnetic detections.

"The next two years will be the peak of the 11-year solar cycle. After a decade of relative inactivity, aurora events like this past weekend are likely to become more frequent over the next couple of years, although solar variability makes precise prediction of such events impossible,” says Albert. “ONC's network might provide a very helpful additional window into the effects of solar activity on the Earth's terrestrial magnetism."

An Acoustic Doppler Current Profiler (ADCP) deployed at Barkley Canyon Axis during the summer 2023 expedition. Credit: ONC/OET/UVic

Ocean Networks Canada (ONC) operates world-leading observatories in the deep ocean, coastal waters and land of the Pacific, Atlantic and Arctic coasts of Canada, and in the Southern Ocean. ONC’s cabled observatories supply continuous power and internet connectivity to scientific instruments, cameras and 12,000-plus ocean sensors. ONC also operates ocean mobile and land-based assets, including coastal radar. ONC, an initiative of the University of Victoria, is supported by the Government of Canada, and is one of the country’s major research facilities.

This research aligns with UVic’s commitment to the United Nations Sustainable Development Goals, and with its strengths in climate action, life below water, life on land, and sustainable cities and communities. Learn more about UVic’s climate traction.

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Click for media kit containing data visualization and ONC infrastructure map.

Media contacts:
Kate Moran (Ocean Networks Canada) at 250-812-1575 or
Mike Gregory (Ocean Networks Canada Communications) at 672-974-7202 or
Jennifer Kwan (University Communications and Marketing) at 250-721-7641 or

About the University of Victoria
UVic is one of Canada’s leading research-intensive universities, offering life-changing, hands-on learning experiences to more than 22,000 students on the edge of the spectacular BC coast. As a hub of transformational research, UVic faculty, staff and students make a critical difference on issues that matter to people, places and the planet. UVic consistently publishes a higher proportion of research based on international collaborations than any other university in North America, and our community and organizational partnerships play a key role in generating vital impact, from scientific and business breakthroughs to achievements in culture and creativity. Find out more at Territory acknowledgement.

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