Space storms may soon be predicted with unprecedented accuracy, thanks to significant advancements in understanding when a violent solar eruption is likely to impact Earth.

Scientists now say it's possible to predict the exact speed of a coronal mass ejection (CME) and its impact time on Earth—even before the CME has fully erupted from the sun. CMEs are bursts of gas and magnetic fields expelled from the solar atmosphere into space.

Figure 1. Enhanced Space Storm Alerts Could Protect Earth's Technology

They can trigger geomagnetic storms that might disrupt terrestrial technology both in Earth's orbit and on its surface, which is why experts worldwide are working to enhance space weather forecasts. Figure 1 shows Enhanced Space Storm Alerts Could Protect Earth's Technology.

Advancements like these could significantly aid in protecting infrastructure crucial to our daily lives, according to researchers from Aberystwyth University. [1] They will present their findings today at the Royal Astronomical Society's National Astronomy Meeting (NAM 2024) in Hull.

They made their discovery by studying specific areas on the sun known as "active regions," where strong magnetic fields give rise to CMEs. The researchers tracked changes in these regions before, during, and after an eruption. A key focus of their study was the "critical height" of the active regions, which is the altitude at which the magnetic field becomes unstable and may trigger a CME.

“By measuring how the strength of the magnetic field decreases with height, we can determine this critical height,” said lead researcher Harshita Gandhi, a solar physicist at Aberystwyth University. “This data can then be used in conjunction with a geometric model that tracks the true speed of CMEs in three dimensions, rather than just two, which is crucial for accurate predictions,” she explained.

She added, “Our findings show a strong correlation between the critical height at CME onset and the actual CME speed. This insight enables us to forecast the CME's speed and, therefore, its arrival time on Earth, even before the CME has fully erupted.” When these CMEs impact Earth, they can trigger geomagnetic storms that produce spectacular aurorae, such as the Northern Lights in the northern hemisphere.

However, these storms also pose risks to crucial systems we depend on daily, including satellites, power grids, and communication networks. This is why scientists globally are dedicated to enhancing our ability to predict CME impacts on Earth more accurately.

To provide better advance warnings, it is essential to accurately determine the speed of a CME shortly after it erupts from the sun. Precise speed predictions allow for more accurate estimates of when the CME will reach Earth, offering critical advance warnings.

Accurate determination of a CME's speed shortly after it erupts from the sun is crucial for providing timely advance warnings. [2] Precise speed predictions enable more accurate estimates of when the CME will arrive at Earth, ensuring critical advance alerts.

Reference:

1. https://phys.org/news/2024-07-dawn-space-storm-shield-earth.html
2. https://www.eurekalert.org/news-releases/1051939

Cite this article:

Janani R (2024), New Space Storm Alert System Could Protect Earth's Technology, AnaTechMaz, pp. 68