All stars and our Sun are variable

All the stars and our Sun are variable plasma stars.

Over 150,000 variable stars are known and catalogued, and many thousands more are suspected to be variable.
Variables: What Are They and Why Observe Them? | American Association of Variable Star Observers

Recurrent novae, superflares, CME's are all part of electromagnetic stars variability, such as Betelgeuse recent astonishing dimming.

We verified 1,216 superflares on 400 solar-type stars... Therefore, superflares are possibly caused by stellar magnetic activities instead of planet-star interactions. We also find an extraordinary star TIC43472154, which exhibits about 200 superflares per year.
Superflares on solar-type stars from the first year observation of TESS

Dimming switch for Betelgeuse intrinsic variable electric stars?

The constellation Orion is one of the most recognizable patterns in the night sky, visible around the world. But if you’ve looked at Orion recently and thought something seemed off, you’re not wrong: The giant red star Betelgeuse, which marks the hunter’s right shoulder, is the dimmest it’s been in almost a century.

Normally, Betelgeuse is among the 10 brightest stars in the sky. However, the red giant began dimming in October, and by mid-December, the star had faded so much it wasn’t even in the top 20.
A giant star is acting strange, and astronomers are buzzing | National Geographic

Another natural variability would be the climate changes to any planets in solar systems. Minimums, maximums, cyclical and spikes.

Variable resistor Betelgeuse

Betelgeuse variable stars sun climate change

To be clear, dimming alone isn’t all that odd for a star like Betelgeuse. It’s what’s known as a variable star, and its shifts in brightness have been closely studied for decades. However, it is unusual for one of the sky’s most prominent points of light to fade so noticeably.

Betelgeuse is classified as a semiregular variable star, meaning that its brightness semiregularly changes. Millennia ago, Australian Aborigines noted the star’s fluctuating luminosity, and British astronomer John Herschel recorded the phenomenon in 1836.

More recently, the American Association of Variable Star Observers has been compiling observations of Betelgeuse’s fits and starts. Decades of photometric data show that Betelgeuse brightens and dims in cycles, with one notable cycle vacillating on a roughly six-year timescale, and another rising and falling every 425 days or so.
A giant star is acting strange, and astronomers are buzzing | National Geographic

Betelgeuse variable electric stars sun

Eta Carinae the variety star

As a result of the electrical dusty plasma cosmology components, feedback systems for solar and galactic circuits, variations in their natural electrical power supplies from local and intergalactic Birkeland currents or whatever is the source of the energy.

One remarkable aspect of Eta Carinae is its changing brightness. It is currently classified as a luminous blue variable (LBV) binary star due to peculiarities in its pattern of brightening and dimming.

Previously a 4th-magnitude star, it brightened in 1837 to become brighter than Rigel, marking the start of its so-called Great Eruption. It became the second-brightest star in the sky between 11 and 14 March 1843 before fading well below naked eye visibility after 1856. In a smaller eruption, it reached 6th magnitude in 1892 before fading again. It has brightened consistently since about 1940, becoming brighter than magnitude 4.5 by 2014.

This is currently the only star thought to emit natural LASER light in ultraviolet wavelengths.
Eta Carinae | wikipedia

stellar magnetic activities variable electric stars

We present up-to-date results of our observing program, including homogeneous photometric data collected between 2003 and 2008. Our observations demonstrated that Eta Car has continued increasing in brightness at a constant rate since 1998. In 2006, it reached its brightest magnitude (V ~ 4.7) since about 1860s. The object then suddenly reverted its brightening trend, fading to V = 5.0 at the beginning of 2007, and has maintained a quite steady state since then.
Long-Term Optical Monitoring of Eta Carinae. Multiband light curves for a complete orbital period

Eta Carinae variable plasma stars climate

Coronal Mass Ejections

Ignoring the magnetic reconnections idea and related NASA Magnetic Universe ideas in the quote below, CME's are part of PC and EU theories.

The more explosive CMEs generally begin when highly twisted magnetic field structures (flux ropes) contained in the Sun’s lower corona become too stressed and realign into a less tense configuration – a process called magnetic reconnection. This can result in the sudden release of electromagnetic energy in the form of a solar flare; which typically accompanies the explosive acceleration of plasma away from the Sun – the CME.

These types of CMEs usually take place from areas of the Sun with localized fields of strong and stressed magnetic flux; such as active regions associated with sunspot groups. CMEs can also occur from locations where relatively cool and denser plasma is trapped and suspended by magnetic flux extending up to the inner corona - filaments and prominences. When these flux ropes reconfigure, the denser filament or prominence can collapse back to the solar surface and be quietly reabsorbed, or a CME may result. CMEs travelling faster than the background solar wind speed can generate a shock wave. These shock waves can accelerate charged particles ahead of them – causing increased radiation storm potential or intensity.
Coronal Mass Ejections |
National Oceanic and Atmospheric Administration