On the Sun: Filament Eruption + CME, 29 September 2013
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Published on Oct 2, 2013
A magnificent eruption ejected a massive cloud of solar plasma out away from the Sun, into interplanetary space on September 29th (2013/09/29). A long filament of plasma hovered above the photosphere, captured by the magnetism in the Sun's northern hemisphere. Then, it erupted in spectacular energy as seen by the Solar Dynamics Observatory, and by Stereo and SOHO spacecraft. This plasma eruption produced a stunningly beautiful coronal mass ejection (CME).
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Coronal mass ejections are often associated with solar activity such as solar flares, but a causal relationship has not been established. A coronal mass ejection is also produced when a plasma filament (or prominence) breaks away from the magnetic clutch of the Sun, escaping the gravitational pull. While many plasma ejections originate from active regions on the Sun's surface, such as groupings of sunspots associated with frequent flares, any plasma formation could break away. Near solar maxima, the Sun produces about three CMEs every day, whereas near solar minima, there is about one CME every five days or even less frequently.
When a CME passes Earth (not all CMEs are directed toward the Earth), it could cause geomagnetic disturbances, triggering aurora and causing disruption of shortwave radio communications.
Although this CME was not aimed at Earth, it passed by the Earth with a glancing blow from the plasma cloud on October 2-3 2013. This caused a geomagnetic storm (minor level), which lowered the Maximum Usable Frequency (MUF) over many ionospheric radio-wave propagation paths on shortwave radio. This lowing of the MUF is often regarded as a degradation of shortwave radio conditions. Some aurora is also produced, though this event did not cause much significant aurora.
More info: http://SunSpotWatch.com
Aurora Watch: http://Aurora.SunSpotWatch.com
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- Tomas / NW7US
- https://Twitter.com/NW7US and https://Twitter.com/hfradiospacewx
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