Ben Gutknecht
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geophysx.bsky.social
Ben Gutknecht
@geophysx.bsky.social
43 followers 64 following 19 posts
Geophysicist, geodesy, global water cycle, sealevel, tectonics, GRACE/-FO, gravimetry, spaceflight, science-to-music converter. Researcher at UBonn. Views are my own.
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Reposted by Ben Gutknecht
We wish you well, fellow Sentinel! With a gentle push, #Ariane6 has released the Copernicus Sentinel-1D satellite to orbit where it will begin its amazing life of scientific discoveries. Keep in touch!
📡🛰️
Reposted by Ben Gutknecht
🛰️ Check out this new publication from our members @makankaregar.bsky.social and @funwithgps.bsky.social on GNSS hydrology, integration between GNSS hydrogeodesy and GNSS remote sensing. It focuses on three GNSS capabilities: reflection, positioning and transmission.

📝 doi.org/10.1016/j.xi...
Reposted by Ben Gutknecht
Publication Alert!
Check out this publication on the development of a global gridded dataset from irrigated and rainfed cropped area from 2000 to 2015 for 23 crop classes by our member Stefan Siebert. Congratulations on the work!

www.nature.com/articles/s41...
Gif sequence from stills, static camera in rotating Earth frame.
Lunar eclipse 2025-09-07, end of Earth's shadow moving off disk.
This is exactly why my multiexposure of the eclipse last night still had an overlap — since I had completely neglected lunar motion around Earth in a 128 sec gap estimate. Mun moves on orbit 3% the length of its body-dia in the meantime. Andrew's pic is brilliant, just wonder why shadow static(?)
Or /iow: waiting longer btw the Moon shots makes the disk 'move' further to the up right b/c camera on Earth has rotated further (24h/day), but at the same time the Mun also had a slight shift to the left on its 28d-journey around Earth. Hence, relative rotation appears 3-4% slower than 2π/24h. 2/2
Nerd-fact: I had roughly estimated from lunar diameter, distance, +Earth rotation that 130s would be just enough to get clear lunar 'disks':
128s=atan(dia/dist)/(2π/24h).
But I neglected lunar counter rotation around Earth, which adds a few seconds to the bill. That's why the disks overlap a bit 1/2
Lunar eclipse tonight, S of Bonn, Germany. Best part was to see how many parents with children came out and patiently waited to observe!
[Pentax K1, in-cam multiexposure every 2m10sec]
Cooking with 15" etopo22 and @wmo-global.bsky.social / GRDC vectors for @crc1502-detect.bsky.social . Rivers truly are lifelines of the water cycle.
So you are saying the enforced d(TWS)/dt — instead of ET + Q — temporarily balances a grand part of the P? 🤭
(rather runoff/surface flow than Q...)
🔈🔉🔊 Please note that this tweet is closing in ten minutes, bye! 📢📢📢
(if you know, you know...)
#LPS25 #esaLPS25
This work contains work from #globalCDA and is a collaboration with WWF @wwf.eu
At #LPS25 in session A.07.02 @jurgenkusche.bsky.social is presenting the development of a global GRACE/-FO assimilation data set and applications in water and biodiversity risk assessment.
@crc1502-detect.bsky.social
@unibonn.bsky.social
Want to discuss impact of anthropogenic water use and varying sea surface temperatures on the water cycle? #LPS25 poster with insights from @crc1502-detect.bsky.social evaluation is up at J18!
Officially yes :-|
But I can still load projects 🤷
What to do when trains don't go to the DETECT retreat? Cycle! 35 km through the beautiful Rhine valley.
Do the groundtracks include model dynamics, d(mean anomaly)/dt, or are they based on the latest TLE? (Rhetorical Q: would we see the difference on such a map?)