Prof. Dr. Dan guy -issimo.
@spacecataz1663.bsky.social
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.
Seeing all these aurora pics from Europe...
January 19, 2026 at 10:58 PM
Seeing all these aurora pics from Europe...
Not a bad year for running off stress.
strava.app.link/CFs81zq5HZb
strava.app.link/CFs81zq5HZb
January 6, 2026 at 2:48 PM
Not a bad year for running off stress.
strava.app.link/CFs81zq5HZb
strava.app.link/CFs81zq5HZb
aaaaaaaaaaaaaaaAAAAAAAAAAAAAAAAAAAAAAAAAHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH
January 5, 2026 at 5:54 PM
aaaaaaaaaaaaaaaAAAAAAAAAAAAAAAAAAAAAAAAAHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH
It is all-the-way winter in Michigan.
December 5, 2025 at 9:23 PM
It is all-the-way winter in Michigan.
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]
I entirely agree with Eric's second point: the space community has been suffering from the lack of stable leadership at NASA. [cont'd]
December 3, 2025 at 3:01 PM
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]
I entirely agree with Eric's second point: the space community has been suffering from the lack of stable leadership at NASA. [cont'd]
I wish I could take credit for this, but yeah nuttin' but clouds up here in MI #NoAurora #Sad #WeatherCanEatMyButt
November 12, 2025 at 2:47 AM
I wish I could take credit for this, but yeah nuttin' but clouds up here in MI #NoAurora #Sad #WeatherCanEatMyButt
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.
November 12, 2025 at 1:34 AM
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.
...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.
November 12, 2025 at 1:34 AM
...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.
Hell yeah the first talk at an IEEE meeting is about space weather.
September 8, 2025 at 8:16 AM
Hell yeah the first talk at an IEEE meeting is about space weather.
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!
BOOOO!
September 2, 2025 at 12:20 PM
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!
BOOOO!
Today was a good day.
for running.
for running.
August 30, 2025 at 7:29 PM
Today was a good day.
for running.
for running.
Holy crap twitter sucks rocks.
July 14, 2025 at 7:02 PM
Holy crap twitter sucks rocks.
Parkrun, Dunedin Botanical Gardens! It's a beautiful fall morning here in southern NZ!
May 2, 2025 at 9:51 PM
Parkrun, Dunedin Botanical Gardens! It's a beautiful fall morning here in southern NZ!
I've had quite the week...
February 7, 2025 at 10:25 PM
I've had quite the week...
I had a foggy pre dawn run in the old part of Bern- the perfect run for SpOoKy season!
October 11, 2024 at 10:13 AM
I had a foggy pre dawn run in the old part of Bern- the perfect run for SpOoKy season!
Bluesky now has over 10 million users, and I was #780,667!
Huzzah. Excelsior.
Huzzah. Excelsior.
September 27, 2024 at 2:54 AM
Bluesky now has over 10 million users, and I was #780,667!
Huzzah. Excelsior.
Huzzah. Excelsior.
TMBG @ DET
May 18, 2024 at 1:14 AM
TMBG @ DET
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)
May 15, 2024 at 12:46 PM
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)
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!
May 10, 2024 at 8:13 PM
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!
May 10, 2024 at 5:10 PM
It's... happening???
www.swpc.noaa.gov/news/swpc-is...
www.swpc.noaa.gov/news/swpc-is...
May 10, 2024 at 1:58 AM
It's... happening???
www.swpc.noaa.gov/news/swpc-is...
www.swpc.noaa.gov/news/swpc-is...