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Prof. Dr. Dan guy -issimo.

@spacecataz1663.bsky.social
377 followers 163 following 249 posts

He/Him. Prof. at the University of Michigan's Climate and Space department. Space scientist. Connoisseur of dumb humor. Opinions and stupid jokes are my own.

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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 31/08/2026
Trying to find a PDF of an older paper online. I tried google scholar first, and hit a complete wall. Tried a regular google search, and did not get anything that actually took me to the paper. Switched to Kagi, a newer, freemium search engine. Literally the first hit was *the* PDF I needed.
Search results for "A Physically Motivated Solution of the Alfven Problem", a 1970 paper by Jay Boris. Google's AI gives me a course in plasma physics that starts relevant, but then goes off into another direction.More goolge search results for the same paper. After the AI block, there are many links to related papers, but they only reference the paper I'm trying to find.Kagi search results for the same paper. The first entry is the actual paper as a PDF. The next items are links to government repositories that contain the original report. All of the results are directly relevant and useful.
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 10/07/2026
Oh boy I read the comments.
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 10/07/2026
The work that @drbwalsh.bsky.social and I did to develop a concept for stopping space weather is now **front page** on the Wall Street Journal. It's been a wild week.
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 05/06/2026
No EPAM not like that.
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 05/06/2026
Storm has arrived super late. Not super fast, but strong magnetic field. Bz is jumping up and down. Kp sitting around 6. The timing **sucks** for North America.
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 10/04/2026
Here's the same thing but funnier. 35-ish years of auroral electrojet data as measured on the ground...
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 10/04/2026
I just downloaded 35 years of SuperMAG electrojet index data for reasons.
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 04/02/2026
Shocking contrast between the solar wind density values observed by IMAP versus ACE- as much as 20 times higher in the new IMAP versus the very old ACE!!! We know ACE is getting old, but holy smokes that's a staggering difference.
NOAA's real time data feed from the ACE spacecraft. Density is shown in the center plot (orange dots) and never gets higher than 20 ions per cubic centimeter.The corresponding data from IMAP. Density (middle frame) reaches as high as 200 ions per cubic centimeter.
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 19/01/2026
Seeing all these aurora pics from Europe...
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 06/01/2026
Not a bad year for running off stress. strava.app.link/CFs81zq5HZb
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 05/01/2026
aaaaaaaaaaaaaaaAAAAAAAAAAAAAAAAAAAAAAAAAHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 14/12/2025
How do you get ready for #FallAGU in 2025? By printing ICE whistles, of course.
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 05/12/2025
It is all-the-way winter in Michigan.
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 03/12/2025
Copy-pasting @sciguyspace.bsky.social's post from TheBadSite to spread the message here. I entirely agree with Eric's second point: the space community has been suffering from the lack of stable leadership at NASA. [cont'd]
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 27/11/2025
Happy Thanksgiving! Gotta calm the nerves during halftime #GoLions
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 12/11/2025
I wish I could take credit for this, but yeah nuttin' but clouds up here in MI #NoAurora #Sad #WeatherCanEatMyButt
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 12/11/2025
So what does SWPC do? They switch to DSCOVR! DSCOVR's plasma instrument is also suspect, often yielding WILD oscillations that are not accurate. That's happening right now! See my annotations in the plot below. You can see when SWPC switches to DSCOVR and when DSCOVR goes nuts.
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 12/11/2025
...breaking this down: this is ACE real time data. The plasma instrument, SWEPAM, is very old. Under strong conditions, the instrument can not give good, clean data. We can see the precise moment where SWEPAM stops operating accurately in the orange, yellow, and green lines below.
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 08/09/2025
Hell yeah the first talk at an IEEE meeting is about space weather.
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 02/09/2025
Very unfortunate storm in the end. The magnetic field of the storm was predominantly northward- meaning it could not effectively transmit energy to the Earth system, preventing the aurora from moving southward. BOOOO!
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 30/08/2025
Today was a good day. for running.
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 23/07/2025
A python code snippet to calculate the amount of time I have left to procrastinate before submitting my AGU abstract. I have plenty of time, no worries. Let's go get a beer. Hang out. I have 7 days and 44,065 seconds left. That's like, what... a thousand hours? I don't even need to be thinking about AGU yet.
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 14/07/2025
Holy crap twitter sucks rocks.
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 02/05/2025
Parkrun, Dunedin Botanical Gardens! It's a beautiful fall morning here in southern NZ!
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 07/02/2025
I've had quite the week...
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 13/01/2025
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 11/10/2024
I had a foggy pre dawn run in the old part of Bern- the perfect run for SpOoKy season!
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 27/09/2024
Bluesky now has over 10 million users, and I was #780,667! Huzzah. Excelsior.
A virtual certificate with text "Celebrating 10M users on Bluesky, #780,667, Prof. Dr. Dan guy -issimo. ‪@spacecataz1663.bsky.social‬, joined on Aug 29, 2023"
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 18/05/2024
TMBG @ DET
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 15/05/2024
The biggest solar storms in terms of well-known space weather effects are the 1989 HydroQuebec event, the 2003 Halloween storm, and now, the Gannon Storm of 2024. How do they compare? We can quantify that with the Dst Index (lower numbers = stronger storm)
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 10/05/2024
The solar storm so far has been great. Dayside magnetopause pushed well within geosynch (via GOES data). <-200nT Dst (SWPC Geospace & USGS real time data). Auroral Electrojet index (AE) well above 2000nT (Kyoto WDC data). In a short amount of time, there's being a lot going on!
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 10/05/2024
Wake up, babe. New solar storm just dropped. #spaceweather #aurora #sun #space
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 10/05/2024
It's... happening??? www.swpc.noaa.gov/news/swpc-is...
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 06/05/2024
This solar cycle continues to put out moderate after moderate storm. Nice on happening right now! Still waiting for a BIG ONE, however. We want to see Dst go below -200nT!
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 06/04/2024
OUR 3-DAY-AHEAD FORECAST IS LIVE FOR THE ECLIPSE! These images show 4 forecasts of what the corona will look like if you're in Dallas, Texas! More details here: clasp.engin.umich.edu/solar-eclips... #EclipseSolar #Eclipse #Eclipse2024
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 25/03/2024
What's cool about the current event is that it was a series of events, each with increasing magnitude (see the red/white line at the bottom of this plot). These types of compound events are super interesting for understanding how the Earth response depends on previous, recent activity.
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 25/03/2024
A series of small/medium storms followed by a "big" one! The timing was bad for North American aurora watchers, but this will be a great storm to study in the future. What we're still missing are the BIG storms of <-250nT Dst that were seen in the early 2000s. Hopefully soon...
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 03/03/2024
I'm late to the party, but solar storm ahoy! It's a moderate storm that's slow moving but with a strong, southward magnetic field sure to drive aurora at higher latitudes. If it's dark where you are, take a peek outside!
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 23/02/2024
Back from the blue team review of our mission concept study for MAAX, a two-spacecraft mission to view both the aurora borealis and australis at the same time. We're making great progress and are on track for delivering a high-quality concept report to NASA in August!
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 23/02/2024
Let's try that picture again:
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 23/02/2024
Here's a first for me: landed in fifth so dense that our plane has to get a tow into the gate.
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 10/02/2024
Hello, Yogost. Uh, I'm good thanks.
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 07/12/2023
Not messing around with these stickers.
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 06/12/2023
If you're at #FallAGU this year, be sure to grab a MAAX sticker from yours truly.
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 01/12/2023
Another good space weather storm last night! - The magnetic field in the solar wind went down to -20nT, producing great aurora. - Dst (bottom line) got down to -150nT, indicating a nice strong response at Earth. - It was a twofer: two CME arrivals creating a weak then strong storm.
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 26/11/2023
We've been getting a steady diet of small-to-medium sized solar storms, driving aurora at higher latitudes. Reports of aurora near mid-latitudes, too! These have been storms with persistent "southward IMF" (red line in top plot is negative).
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 07/11/2023
I'm on a hybrid meeting (40 people online, ~30 in person). Lunch for in-person people is late in arriving, so we're just continuing with presentations. We're just plowing ahead, unabated. There's no sign of lunch.
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 06/11/2023
Last night's storm was officially a good one! Lots of aurora, Dst well below -100nT (both observed and modeled), STRONG southward interplanetary magnetic field... This is going to be an event that is studied in the near future. Thanks, solar maximum!
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 24/10/2023
I think I need a clarification concerning the presentation I will be giving.
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Prof. Dr. Dan guy -issimo. @spacecataz1663.bsky.social · 06/10/2023
looool oh yeah this is from Feb. It's still there.
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