Fwd: [vhf-dx] Fwd: G2-class geomagnetic storms are possible on April 25th

[Itacir Amorim]

Repassando  para conhecimento geral.   73

---------- Forwarded message ---------
De: PY2ZX <py2z...@gmail.com>
Date: sex., 23 de abr. de 2021 às 21:05
Subject: [vhf-dx] Fwd: G2-class geomagnetic storms are possible on April 25th
To: vhf-dx <vhf...@googlegroups.com>
Cc: vhf-dx-carib <vhf-dx...@googlegroups.com>, vhf-dx-sur <vhf-d...@groups.io>

FYI... 73! Flávio PY2ZX
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GEOMAGNETIC STORM WARNING: NOAA forecasters say that G2-class
geomagnetic storms are possible on April 25th when a coronal mass
ejection (CME) is expected to hit Earth's magnetic field. The CME was
hurled in our direction yesterday by a C3.8-class flare from sunspot
AR2816 (details below). If the geomagnetic storm occurs as predicted,
auroras could dip into northern-tier US states from Maine to
Washington.

SOLAR TSUNAMI AND CME: Earth-facing sunspot AR2816 exploded on April
22nd (0435 UT), producing a C3.8-class solar flare. NASA's Solar
Dynamics Observatory recorded a dramatic shock wave rippling away from
the blast site:

This is a "solar tsunami." It is a wave of hot plasma and magnetism,
about 100,000 km tall, racing outward at approximately 250 km/s
(560,000 mph). Such waves are usually associated with the launch of
coronal mass ejections (CMEs)--and indeed, one has been observed.

Coronagraphs onboard the Solar and Heliospheric Observatory (SOHO)
detected a CME billowing away from the sun hours after the flare. It
is faint but definitely Earth-directed:

The initial velocity of the CME was ~760 km/s. Based on its speed and
other factors, NOAA forecasters believe that the CME will reach Earth
on April 25th, potentially sparking G2-class geomagnetic storms.

Friday, Apr. 23, 2021
https://spaceweather.com/

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________________________________
Itacir Amorim - PY1EJ/PY3ASQ
Rio de Janeiro/RJ - Canoas/RS

py1e...@gmail.com