All articles tagged with #coronal hole
NOAA has issued a G3 warning due to effects from a coronal hole high-speed stream, impacting radio communications and navigation, with conditions expected to persist into Wednesday evening, December 3, 2025.
The northern lights may be visible in northern U.S. states due to minor geomagnetic storms caused by a coronal hole on the Sun, with the best viewing times between 10 p.m. and 2 a.m. and visibility extending to parts of Washington, Idaho, Montana, North Dakota, Minnesota, Wisconsin, Michigan, Maine, and Alaska.
A large butterfly-shaped coronal hole in the sun's atmosphere is sending solar wind toward Earth, potentially causing minor to moderate geomagnetic storms and spectacular auroras during September 13-14, especially around the autumn equinox when Earth's magnetic field is more receptive to solar wind interactions.
A coronal hole in the sun is sending charged particles toward Earth, likely causing intense auroras visible from about 15 U.S. states, especially in Alaska and Canada, due to a moderate geomagnetic storm.
A large coronal hole has opened in the Sun's southern hemisphere, releasing high-speed solar wind that is expected to cause a moderate G2 geomagnetic storm around June 14, potentially leading to auroras visible at high latitudes.
Scientists have observed plasma waves from a solar flare being focused by a coronal hole for the first time, similar to how lenses focus light. This discovery, made using data from NASA's Solar Dynamics Observatory, could help diagnose plasma properties and investigate wave focusing in other astronomical systems.
Scientists have observed a massive coronal hole in the atmosphere of the Sun, measuring more than five times the diameter of Jupiter. This temporary region of cool, less dense plasma is releasing a forceful solar wind that is blasting through the Solar System. While the hole was pointed towards Earth a few days ago, resulting in a mild solar storm, experts believe it will soon rotate away from our planet. This occurrence is part of the Sun's regular cycle of activity, with solar maximum expected to take place in 2024. Although the recent coronal hole could lead to a geomagnetic storm, it has not been as powerful as initially anticipated.
A large dark hole, known as a coronal hole, wider than 60 Earths has opened up on the sun's surface, emitting powerful streams of unusually fast radiation called solar wind. The solar wind is heading towards Earth and could potentially trigger a moderate geomagnetic storm, leading to radio blackouts. NASA explains that coronal holes appear dark because they are cooler, less dense regions with open, unipolar magnetic fields, allowing the solar wind to escape more easily into space.
Scientists have discovered a massive coronal hole on the sun's surface, equivalent to about 60 Earths in size. The hole, which started forming on December 2, reached its maximum width of about 497,000 miles in just 24 hours. Although temporary, the hole could have caused disruptions such as geomagnetic storms and radio signal interference. The duration of the hole is uncertain, but most coronal holes last for more than a full solar rotation of about 27 days.
A massive hole, measuring more than 60 times the diameter of the Earth, has opened up in the Sun's atmosphere. These coronal holes occur when the Sun's magnetic field allows a stream of its upper atmosphere to pour out as solar wind. While this can potentially cause disruptions to satellites and the electrical grid, scientists are not expecting any major disruptions from this particular hole. The Sun's solar activity is currently stronger than expected, indicating that more awe-inspiring events may occur in the near future.
A massive coronal hole on the Sun, over five times larger than Jupiter, has been unleashing a powerful solar wind that recently directed a stream of particles towards Earth, resulting in a mild solar storm. This hole is part of the Sun's activity cycle, which includes sunspots, solar flares, and coronal mass ejections. As we approach solar maximum in 2024, the Sun's magnetic field will reverse polarity. While the current solar cycle has been stronger than expected, the maximum sunspot number is predicted to be below average.
A large coronal hole has opened up on the Sun's surface, which is large enough to fit 20 Earths inside. While these holes usually appear near the poles, this one is near the equator, potentially leading to visible auroras on Earth as the Sun's particles shoot across the solar system. Despite the recent powerful solar storm causing geomagnetic storms and light shows, experts assure that there is no reason for concern as it did not cause any damage to satellites or power grids on Earth.
The Parker Solar Probe has detected the source of the fast solar wind that blows from the Sun's corona through a hole in its atmosphere. The probe's readings suggest that a specific type of magnetic reconnection is what drives this powerful force of nature. The coronal hole is a bit like a shower head, with roughly evenly spaced jets emerging from places where magnetic field lines "funnel" into and out of the surface of the Sun. The findings provide strong evidence that it's reconnection that's providing the energy source of the fast solar wind.
Two giant coronal holes have opened up on the surface of the Sun, with the second one potentially sending solar winds measuring millions of miles per hour towards Earth. The location of the second hole, which is right on the Sun's equator, makes it particularly interesting. While the effects are usually not a danger to Earth, the winds could potentially impact Earth's magnetic field and affect satellites and technology.
Two giant coronal holes have opened up on the surface of the Sun, with the second one potentially sending solar winds measuring millions of miles per hour towards Earth. The location of the second hole, which is right on the Sun's equator, makes it particularly interesting. While the effects are usually not a danger to Earth, the winds could potentially impact Earth's magnetic field and affect satellites and technology.