Researchers from NASA and the University of Lancaster have discovered evidence indicating that the impacts of the most severe solar storms have been underestimated. A study published in the journal Nature this Wednesday (15) raises questions about the existence of a maximum limit to the Earth's magnetic field response.
The investigation focused on analyzing data from electric currents in the upper atmosphere and solar winds to determine how the planet reacts to major space events. The scientists concluded that any observed stabilization in the effects could be a statistical artifact of the measurements, rather than a sign of natural protection against extreme phenomena.
The work was conducted by Nithin Sivadas, a researcher at NASA's Goddard Space Flight Center, in collaboration with Maria Walach from the University of Lancaster. The analysis points out that unusual solar storms have the potential to generate more intense consequences for navigation systems, satellites, and communications.
For many years, the scientific community believed that the influence of solar storms would have a saturation point. This belief was based on the observation that certain atmospheric electric currents seemed to cease increasing even when the solar wind became stronger. The new study proposes that this apparent saturation might be a result of the data collection methodology.
Much of the measurements of extreme events comes from probes located at Lagrange point 1, an area about 1.6 million kilometers from Earth toward the Sun. The researchers argue that the disparity between the strength of the solar wind measured at this point and what actually reaches the planet can distort the data. By aggregating these data in large volumes, more extreme values end up appearing less intense, creating the illusion of a limit to the Earth's response.
To test this hypothesis, the team examined over one million records of solar wind captured by NASA spacecraft in orbit near Earth. The findings demonstrated a direct correlation between the intensity of the solar wind and the increase in electric currents in the upper layer of the atmosphere. According to the authors, this conclusion fundamentally changes how risk scenarios for extreme space events should be assessed.
If there is no maximum limit to the planetary response, very powerful solar storms could cause technological damage greater than currently predicted. Geomagnetic storms are temporary variations in the magnetic field and plasma around the Earth. In severe cases, they can affect satellites, disrupt GPS and communication signals, cause failures in power grids, and increase radiation exposure for pilots and astronauts.
Despite being rare events, the researchers emphasize that the low frequency of these occurrences makes accurate large-scale predictions difficult. The team concludes that only new records will allow for a clearer understanding of Earth's behavior in the face of an exceptional solar storm.
The Sun has become active again, rapidly releasing a series of flares that are being closely monitored by scientists. As a result, stronger and more noticeable polar lights may appear in the coming days.
According to Space.com, this series of events is unusual due to its speed. In less than 24 hours, the Sun released an X1.1 class flare and more than ten M-class flares. Some of these explosions were accompanied by Coronal Mass Ejections (CMEs)—large clouds of particles sent into space.
Solar activity physicist Tamita Skov described the situation as a 'solar automatic,' which helps to understand the atypical pace of flares occurring almost sequentially. She stated that more than five solar storms are heading towards Earth, and at least three of them are capable of causing visible auroras.
Forecasts indicate that these ejections will arrive between July 2nd and 3rd. The impact could range from G1 to G2 level geomagnetic storms. NOAA confirms that at least one such CME is already headed toward the planet, while others are still under analysis.
Expected consequences include:
However, the complete accuracy of forecasts is not guaranteed, as the Sun's behavior can change the scenario.
If everything proceeds according to forecasts, the aurora may appear further south than usual, including northern areas of the United States, such as New York and Idaho. However, clear and dark skies are critically important. It is also noted that the brightness of the auroras depends on the interaction between the CME and the Earth's magnetic field, and this 'coupling' can be strong or weak.
Despite this, an alert has been issued. The arrival of several solar ejections simultaneously increases the interest of sky observers.
Due to this rhythm of the Sun, Earth is entering a period of heightened attention to space weather. Although this phenomenon is not rare, observing such a number of consecutive flares does not happen daily. We must continue to monitor developments and look at the sky if you are in the Northern Hemisphere, as the sky might present an unexpected spectacle.
