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Due to the Parker Spiral & travel time, the CH rotates ~40° passed CM before connection, giving the impression that's the form of the CH that's currently impacting Earth. This is not the case, meaning change in a CH beyond CM has little to no influence on what Earth sees.

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Second, the fast solar wind from a CH that reaches Earth is that from when it is near CM, roughly three days prior to connection, not that of its more westward position.

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Although they do change in size, be mindful of perception & angle. CHs are viewed via the corona, which is the outer most layer of the Sun, thus when looking at a CH from any view point other than dead center, there is a lot of material/plasma that can obstruct the view.

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Let's clear up two common misconceptions when it comes to coronal holes (CH). 🧵 First, do not be fool into thinking the size has changed drastically, growing from east to central meridian (CM) and then shrinking from central meridian westward. ☀️

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Sara Housseal ☀️ @snhwx.bsky.social · 15/01/2025

With new active regions appearing, we will have to keep a close eye on the eastern portion of the Sun. Flare activity is quiet, for now, but that can switch up quick. 👀☀️

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2025 is the year of trolling and making fools of big news media companies that spread misinformation and clickbait about space weather. I'm 2 for 3 with effectively getting a post deleted. 👊

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Sara Housseal ☀️ @snhwx.bsky.social · 15/01/2025

The fast solar wind from the western most, finger-like extension of the coronal hole is reaching Earth now and should continue to ramp up as the entirety of the coronal hole rotates westward. This could enhance geomagnetic activity over the coming days. ☀️

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Sara Housseal ☀️ @snhwx.bsky.social · 13/01/2025

In case you come across a bunch of hype about a "big hole in the Sun", it's really not that serious and is a normal part of the solar cycle, as always. Wait until we get to solar minimum and coronal holes take up nearly half of the Earth-facing disk at times. ☀️ Solar Max >>> Solar Min

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Sara Housseal ☀️ @snhwx.bsky.social · 12/01/2025

First it was the AGU FOMO and now the AMS FOMO. Excited to be at Space Weather Workshop in a little over two months in Boulder, Colorado! Who will I be seeing there?! ☀️

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Reposted by Sara Housseal ☀️

Karl Battams @sungrazercomets.bsky.social · 12/01/2025

Comet G3 ATLAS looking great in the raw Blue filter LASCO C3 images! ☀️🔭

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Sara Housseal ☀️ @snhwx.bsky.social · 12/01/2025

We have another super bright comet (C/2024 G3 Atlas) making an appearance in LASCO C3 imagery! ☀️☄️

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Sara Housseal ☀️ @snhwx.bsky.social · 08/01/2025

As a majority of the regions on the disk continue to decline and/or rotate off with no replenishment, background x-ray flux has dipped into B level. Not completely unusual, but shows how easily activity can change no matter how good or bad things look on any given day. ☀️

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Sara Housseal ☀️ @snhwx.bsky.social · 08/01/2025

SDO Outage Update 🚨 AIA imagery feeds have started to be restored. There is still no HMI imagery, but progress is being made! ☀️

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Sara Housseal ☀️ @snhwx.bsky.social · 07/01/2025

This is referring to solar wind speeds, which isn't literal winds in space but the flow of plasma which we measure based on the speed of the particles being accelerated.

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Sara Housseal ☀️ @snhwx.bsky.social · 07/01/2025

The anticipated CME from the M4 flare on the 6th has little to no plasma ejection appearing in coronagraph despite possibly a small, weak puff to the north. Little to no activity is expected as a result at this time.

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Sara Housseal ☀️ @snhwx.bsky.social · 07/01/2025

Update on underperforming CME activity: The possible glancing blow CME from the 4th appears to have arrived around 04Z today. Despite providing a decent jump to wind speeds, magnetic field connection has been weak, so G1 has not been reached. 1/2 ☀️

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Sara Housseal ☀️ @snhwx.bsky.social · 06/01/2025

What if I started doing regular space weather chit chat livestreams where we can talk about whatever is currently going on and/or whatever else based on questions ya'll have? 👀☀️

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Sara Housseal ☀️ @snhwx.bsky.social · 05/01/2025

CME in question, which is directed mostly to the southwest but does create a faint partial halo signature, indicating an Earth-directed component is possible.

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Sara Housseal ☀️ @snhwx.bsky.social · 05/01/2025

New G1 Watch for the 6th following analysis of the CME associated w/ the long duration C7 flare from AR3939 on the 4th. While I personally wouldn't expect much of anything from this on its own, the environment is already disturbed, so it wouldn't take much to see G1 conditions. ☀️

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Reposted by Sara Housseal ☀️

Brian G Weber Photography @briangweber.com · 05/01/2025

Still dodging clouds to get my solar and lunar images, but this one had much better results. I really like imaging the sun when there are so many sunspots! Details: buff.ly/3W8hDAx #astrophotography #photography #sunspots #solarflares #space 🔭 📷 🧪

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UPDATE: As of 22:15Z, minor radiation storm level has been reached

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Are we gonna hit all 3 storm scales in the first 4 days of 2025? 💥 ☀️ Currently approaching radiation storm levels following some west limb eruptions.

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How many X-class flares in total do you think AR3947 will pop off during its time on the Earth-facing disk? 💥☀️

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Despite expecting a CME around the same time, I would argue the current enhancement in the solar wind/magnetic is due to the fast solar wind from large +CH05. Are we finally reaching the point in the solar cycle where coronal holes can be a reliable source of activity again? ☀️

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As soon as I walked into work today, AR3947 popped it's third X-class flare. I see how this week is going to go...

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Due to it being so far east still, it is very unlikely that any associated coronal mass ejection reaches Earth. As for the flare itself, the electromagnetic radiation travels at the speed of light, reaching and ionizing the ionosphere within 8 minutes.

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New trouble maker has entered the chat. ☀️ Second X-class flare today from new region AR3947 in the northeast! 💥

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It is a global measurement of geomagnetic activity that indicates different levels of geomagnetic storms. Here is the full scale:

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