@slavkobogdanov.bsky.social
Astrophysicist ordinaire. Columbia University. slavko.org
In fact, when we model the surface radiation from millisecond pulsars , we have to take the rotation induced oblateness into account: ui.adsabs.harvard.edu/abs/2019ApJ....
22.11.2025 01:09 — 👍 5 🔁 1 💬 0 📌 0Millisecond pulsars are actually non-negligibly oblate due to their rapid rotation.
22.11.2025 01:06 — 👍 4 🔁 0 💬 1 📌 0
The Green Bank Observatory invites the scientific community to submit Special Call proposals for filler-time observations on the Green Bank Telescope (GBT) during the 25B and 26A semesters.
Submission Deadline: Friday, November 28, 2025, at 22:00 UTC
#Astronomy #RadioAstronomy #GreenBankTelescope
media3.giphy.com/media/v1.Y2l...
21.11.2025 00:42 — 👍 1 🔁 0 💬 0 📌 0This is basically the premise of the recurring Wikibear skit on the Conan O’Brien show ~10 years ago.
20.11.2025 22:53 — 👍 3 🔁 0 💬 1 📌 0[astronomers clamoring] is a regular occurrence at the VLA, even when we're not on tv.
#Pluribus #VeryLargeArray #Astronomy
Students, apply for a CERN summer studentship. Greatest experience ever!
Deadline 26 January 2026. careers.cern/programmes/s...
(It's not just for physicists. Check it out.)
🧪⚛️🔭
15.11.2025 15:27 — 👍 23 🔁 11 💬 0 📌 0Irwin was my academic advisor my first year of graduate school. He and my now wife became instant best friends upon meeting because they are both from Queens, NY.
13.11.2025 21:29 — 👍 3 🔁 0 💬 0 📌 0
An infographic showing how different aurora colors are produced by different gasses at various altitudes in the atmosphere.
I’ve seen this shared several times with the header and footer not visible, so you can’t see the artists’s name.
Credit: Leo the Alien — alienyrox on redbubble and other platforms.
Space Weather Message Code: ALTK08 Serial Number: 53 Issue Time: 2025 Nov 12 0122 UTC ALERT: Geomagnetic K-index of 8, 9- Threshold Reached: 2025 Nov 12 0121 UTC Synoptic Period: 0000-0300 UTC Active Warning: Yes NOAA Scale: G4 - Severe NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude. Induced Currents - Possible widespread voltage control problems and some protective systems may mistakenly trip out key assets from the power grid. Induced pipeline currents intensify. Spacecraft - Systems may experience surface charging; increased drag on low earth orbit satellites, and tracking and orientation problems may occur. Navigation - Satellite navigation (GPS) degraded or inoperable for hours. Radio - HF (high frequency) radio propagation sporadic or blacked out. Aurora - Aurora may be seen as low as Alabama and northern California.
:Product: 3-Day Forecast :Issued: 2025 Nov 12 0030 UTC # Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center # A. NOAA Geomagnetic Activity Observation and Forecast The greatest observed 3 hr Kp over the past 24 hours was 3 (below NOAA Scale levels). The greatest expected 3 hr Kp for Nov 12-Nov 14 2025 is 8.00 (NOAA Scale G4). NOAA Kp index breakdown Nov 12-Nov 14 2025 Nov 12 Nov 13 Nov 14 00-03UT 5.00 (G1) 6.67 (G3) 4.67 (G1) 03-06UT 7.33 (G3) 6.33 (G2) 4.00 06-09UT 6.00 (G2) 6.00 (G2) 3.33 09-12UT 4.67 (G1) 4.67 (G1) 3.67 12-15UT 4.33 4.00 3.33 15-18UT 8.00 (G4) 3.33 3.00 18-21UT 7.67 (G4) 4.33 3.00 21-00UT 7.00 (G3) 4.67 (G1) 3.33 Rationale: CME activity from 09-11 Nov is likely to cause G1-G4 (Minor-Severe) levels on 12 Nov, G1-G3 (Minor-Strong) storm levels on 13 Nov and G1 (Minor) levels early on 14 Nov. B. NOAA Solar Radiation Activity Observation and Forecast Solar radiation, as observed by NOAA GOES-18 over the past 24 hours, was above S-scale storm level thresholds. Solar Radiation Storm Forecast for Nov 12-Nov 14 2025 Nov 12 Nov 13 Nov 14 S1 or greater 99% 75% 55% Rationale: The greater than 10 MeV proton flux is expected to continue above the S1 (Minor) threshold through 13 Nov, with S2 levels possible through 12 Nov. Further enhancements are possible with the arrival of the 09-11 Nov CMEs on 11 and 12 Nov. C. NOAA Radio Blackout Activity and Forecast Radio blackouts reaching the R3 levels were observed over the past 24 hours. The largest was at Nov 11 2025 1004 UTC. Radio Blackout Forecast for Nov 12-Nov 14 2025 Nov 12 Nov 13 Nov 14 R1-R2 85% 85% 85% R3 or greater 55% 55% 55% Rationale: R1-R2 (Minor-Moderate) radio blackouts are expected, with further R3 (Strong) activity likely on 12-14 Nov due to the flare potential of Region 4274.
Map from NOAA titled showing North America and the North Pole with a color gradient overlay of aurora likelihood.
Map from NOAA titled showing North America and the North Pole with a color gradient overlay of aurora likelihood.
Aurora Forecast Update for 2025-11-12T01:30:26Z
ALERT: Geomagnetic K-index of 8, 9-
Threshold Reached: 2025 Nov 12 0121 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Scale: G4 - Severe
Additional Details Here.
Key antenna in NASA’s Deep Space Network damaged
One of the largest antennas in NASA’s Deep Space Network was damaged in September and may be out of service for an extended period, further straining the system.
😎 This is cool 👇 Explore 25 years on the International Space Station. This multimedia project replays every day of the past 25 years on board and consists entirely of historical mission material. By @benfeist.bsky.social and David Charney.
issinrealtime.org
Did you know?
In 2025, the U.S. quarter features Vera Rubin, honoring her landmark discovery of the existence of dark matter — a tribute that perfectly coincides with the first light of the Rubin Observatory(@vrubinobs.bsky.social), celebrating her enduring legacy in unveiling the unseen universe.
Fonts where upper case i and lower case L are indistinguishable should be banned. Il
07.11.2025 15:04 — 👍 4 🔁 0 💬 0 📌 0George Michael’s “Freedom” music video…
03.11.2025 23:05 — 👍 1 🔁 0 💬 0 📌 0Open Sesame!
The ELT doors have moved for the first time. This was no small feat, as each door will weigh 650 tonnes once completed.
The ELT dome & its doors will guard the telescope from the harsh conditions of the Atacama Desert.
https://www.eso.org/public/videos/potw2544a/
🔭 🧪
📹 ESO/ACe
On Sunday, humans marked 25 years of continuous presence in Earth orbit, via the International Space Station. For @sciam.bsky.social, @astrojonny.bsky.social looks at the surge of commercial space stations that might keep this trend going to 2050.
www.scientificamerican.com/article/the-...
The person who runs the Louvre of Bluesky account perusing your mentions:
02.11.2025 20:24 — 👍 0 🔁 0 💬 0 📌 0arXiv will no longer accept review articles and position papers unless they have been accepted at a journal or a conference and complete successful peer review.
This is due to being overwhelmed by a hundreds of AI generated papers a month.
Yet another open submission process killed by LLMs.
Are you a grad student interested in writing for Astrobites, or do you know one? We're recruiting! Apply by November 26 :)
astrobites.org/2025/10/31/a...
'Astronomers' is an anagram for 'moon starers.'
27.10.2025 15:22 — 👍 973 🔁 193 💬 19 📌 10
Cover of Merriam-Webster's All Caps dictionary, a red background with a white circle and text for people who are mad.
HAPPY INTERNATIONAL CAPS LOCK DAY SORRY FOR OUR DELAY WE DIDN'T EVEN KNOW THIS WAS A REAL DAY.
22.10.2025 20:44 — 👍 2664 🔁 712 💬 88 📌 82
