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------- Forwarded Message -------
From: Robert Arnold <rarnold357@yahoo.com>
Date: On Thursday, June 4th, 2026 at 7:44 AM
Subject: SOLAR ACTIVITY
To: Frank (KA1WJ) <ka1wj@comcast.net>, Vicki Brunetti <mimisboy210@gmail.com>, k2rrx@protonmail.com <k2rrx@protonmail.com>, tonybisogna@gmail.com <tonybisogna@gmail.com>, Ron K4ZZ <k4zzron@gmail.com>, Billy *KZ3I) <slabfoot@gmail.com>, wb4kw@aol.com <wb4kw@aol.com>, LEN (KI4BFN) <ki4bfn-len@twc.com>, Neil Griffin <grin1neil@outlook.com>, kk4vh@juno.com <kk4vh@juno.com>, Don Parker KQ4SBZ <kq4sbz@gmail.com>, Herman Cox <h.cox@outlook.com>, k4sdl@arrl.net <k4sdl@arrl.net>, MIKE HICKS (KL2YE) <mghhicks@yahoo.com>, John (Cypress) KD4ZUL <kd4zul@yahoo.com>, Hector K4OMP <alarmham@gmail.com>, Chris N4WQR <straycat289@gmail.com>, n4nrw@arrl.net <n4nrw@arrl.net>, John (W3UX) Pantaloni <unclexray@gmail.com>, nn2xqm@gmail.com <nn2xqm@gmail.com>, ivietheoperator@gmail.com <ivietheoperator@gmail.com>, beackerr@aol.com <beackerr@aol.com>

GET READY FOR AURORAS: Sky watchers in Europe and North America might see auroras tonight (June 4-5) if, as expected, a Cannibal CME strikes Earth. The impact could spark strong (G3) geomagnetic storms with isolated periods of severe (G4) activity. During similar storms in the past, naked-eye auroras have been visible in more than 25 US states. Pro tip: Get away from city lights! CME Impact Alerts: SMS Text

WHAT IS A CANNIBAL CME? Just what it sounds like. A CME that eats other CMEs. Yesterday, sunspot 4455 exploded several times and hurled multiple CMEs into space. One of the CMEs was so fast, it caught a slower CME and swallowed it. This NOAA model shows what happened:

The combined Cannibal CME is expected to reach Earth during the late hours of June 4th or June 5th. This is good news for sky watchers because Cannibal CMEs are very good at producing geomagnetic storms and auroras. Remember the great geomagnetic storm of May 2024? That was caused in part by a Cannibal CME. Tonight's storm will not be as intense as May 2024, but it could be good if NOAA's model is correct.

Meanwhile, don't be surprised if there is another strong solar flare today. Sunspot 4455 is a rare anti-Hale sunspot. "Anti-Hale" means the sunspot has a reversed-polarity magnetic field, which makes it unstable and explosive. Solar Flare Alerts: SMS Text





Solar wind
speed: 391.2 km/sec
density: 1.14 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 1131 UT
X-ray Solar Flares
6-hr max: C2 0742 UT Jun04
24-hr: M6 1134 UT Jun03
explanation | more data
Updated: Today at: 1135 UT
Daily Sun: 04 Jun 26
Expand: labels | no labels
Sunspot 4455 has a 'beta-gamma-delta' magnetic field that poses a threat for X-class solar flares. Credit: NASA/SDO

Sunspot number: 141
What is the sunspot number?
Updated 04 Jun 2026
Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/Ovation
Planetary K-index
Now: Kp= 1.00 quiet
24-hr max: Kp= 3.33 quiet
explanation | more data
Interplanetary Mag. Field
Btotal: 4.92 nT
Bz: -2.33 nT south
more data: ACE, DSCOVR
Updated: Today at 1131 UT
Coronal Holes: 04 Jun 26

There are no large equatorial coronal holes on the Earthside of the sun.