GIANT Sunspot AR335 Exploded, producing X1-class solar flare: Radio Blackout in USA, Pacific Ocean area

On July 2, at 2314 Universal Time, an eruption from the giant sunspot AR3354 sent out an X1-class solar flare, an impressive display of our sun's turbulent activity.

This significant solar storm event was diligently captured by NASA's Solar Dynamics Observatory (SDO).

Radiation Impact: Shortwave Radio Blackout

As this X1 solar flare radiation hit Earth, it ionised the uppermost layers of our atmosphere. The result was a profound shortwave radio blackout, stretching across the western USA and into the Pacific Ocean.

This blackout created unexpected challenges for mariners and ham radio operators who may have experienced signal loss and other issues for over half an hour after the solar storm's initiation.

An Absence of CME: A Solar Storm Anomaly

Interestingly, despite the solar flare's power, this X-flare event did not trigger a Coronal Mass Ejection (CME) from the sun's atmosphere.

This surprising lack of a CME was verified by the absence of any notable features in the images from the SOHO coronagraph, an instrument specifically designed to observe the solar corona.

A Unique Trigger: Plasma Plume Interaction with Sunspot AR3354

What sparked the X1 solar flare from the sunspot AR3354 was a rather unusual occurrence. According to a 304 Angstrom movie from the SDO, the eruption was instigated by a plasma plume curling over the sun's limb and interacting with the sunspot.

This magnetised gas, hot and charged, initiated the X1 solar flare when it landed on AR3354, illustrating the dynamic and somewhat unpredictable nature of solar storms.

Looking Ahead: Understanding the Sun's Power

The eruption of sunspot AR3354 and the resulting X1 solar flare stand as potent reminders of the solar system's powerful forces.

Monitoring by NASA and NOAA helps us to better understand these phenomena, as we continue to study the sun's potential for dramatic activity and the effects of such solar storms on our planet.

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