Frederik Dahl Madsen
@fdmadsen.bsky.social
He/Him
PhD student at the University of Edinburgh. Keen geophysicist with interest in Geomagnetism, Earth's Rotation, and Outreach!
FRAS, Postgraduate Rep for British Geophysical Association
PhD student at the University of Edinburgh. Keen geophysicist with interest in Geomagnetism, Earth's Rotation, and Outreach!
FRAS, Postgraduate Rep for British Geophysical Association
Very pleased to see Isobel's article on Length-of-day published in the Edinburgh Student Journal of Science #ESJS. 🕰️🌍🎉
This was my first experience in independently supervising an undergraduate project, and I must say I am very proud of what my students achieved!
journals.ed.ac.uk/esjs/article...
This was my first experience in independently supervising an undergraduate project, and I must say I am very proud of what my students achieved!
journals.ed.ac.uk/esjs/article...
Hilbert-Huang Transform Analysis of Intradecadal Variations in the Length of Earth's Day
| Edinburgh Student Journal of Science
journals.ed.ac.uk
November 13, 2025 at 11:26 AM
Very pleased to see Isobel's article on Length-of-day published in the Edinburgh Student Journal of Science #ESJS. 🕰️🌍🎉
This was my first experience in independently supervising an undergraduate project, and I must say I am very proud of what my students achieved!
journals.ed.ac.uk/esjs/article...
This was my first experience in independently supervising an undergraduate project, and I must say I am very proud of what my students achieved!
journals.ed.ac.uk/esjs/article...
An unexpected benefit to visiting aforementioned supervisor is the scenic post-lunch runs around West Kirby
November 4, 2025 at 2:38 PM
An unexpected benefit to visiting aforementioned supervisor is the scenic post-lunch runs around West Kirby
Despite train cancellations, I’m on my way to @liverpooluni.bsky.social to visit my geodesy-supervisor! Do quite enjoy working on the train these days
November 3, 2025 at 8:38 AM
Despite train cancellations, I’m on my way to @liverpooluni.bsky.social to visit my geodesy-supervisor! Do quite enjoy working on the train these days
Are you an early career researcher in geophysics or astronomy? Come to our event in London in two weeks!
Attention early career researchers! 🧑🔬🪐🌋
On 14 November we're hosting an event you might be interested in...
Networking ✅
Career panel advice ✅
Open discussions ✅
Want to come along? Grab a ticket via: ras.ac.uk/early-career...
On 14 November we're hosting an event you might be interested in...
Networking ✅
Career panel advice ✅
Open discussions ✅
Want to come along? Grab a ticket via: ras.ac.uk/early-career...
November 1, 2025 at 11:23 AM
Are you an early career researcher in geophysics or astronomy? Come to our event in London in two weeks!
Give my supervisor a listen, as he excellently explains the south Atlantic anomaly in the geomagnetic field 🧲 🌍 @bgs.ac.uk
A weak spot in the Earth’s magnetic field has nearly doubled in surface area since 2014.
BGS Geophysicist Ciarán Beggan appeared on @earthskyscience.bsky.social's podcast to explain why this is happening, and what the consequences might be.
Watch the full episode: www.youtube.com/watch?v=az8K...
BGS Geophysicist Ciarán Beggan appeared on @earthskyscience.bsky.social's podcast to explain why this is happening, and what the consequences might be.
Watch the full episode: www.youtube.com/watch?v=az8K...
November 1, 2025 at 11:22 AM
Give my supervisor a listen, as he excellently explains the south Atlantic anomaly in the geomagnetic field 🧲 🌍 @bgs.ac.uk
Very excited to be at the #DeepDyn dynamos in a nutshell workshop at @mpsgoettingen.bsky.social !
The most exciting thing, of course, is to learn how to use the #MagIC dynamo code. 🌍
Second most exciting thing is having vegan currywurst for lunch! 🌭
The most exciting thing, of course, is to learn how to use the #MagIC dynamo code. 🌍
Second most exciting thing is having vegan currywurst for lunch! 🌭
October 28, 2025 at 1:15 PM
Very excited to be at the #DeepDyn dynamos in a nutshell workshop at @mpsgoettingen.bsky.social !
The most exciting thing, of course, is to learn how to use the #MagIC dynamo code. 🌍
Second most exciting thing is having vegan currywurst for lunch! 🌭
The most exciting thing, of course, is to learn how to use the #MagIC dynamo code. 🌍
Second most exciting thing is having vegan currywurst for lunch! 🌭
Reposted by Frederik Dahl Madsen
Bird flu surges and a government shutdown collide, complicating efforts to track cases and protect flocks.
Mosquitoes Discovered in Iceland for the First Time amid Rising Temperatures
Bird flu surges and a government shutdown collide, complicating efforts to track cases and protect flocks.
www.scientificamerican.com
October 27, 2025 at 2:20 PM
Bird flu surges and a government shutdown collide, complicating efforts to track cases and protect flocks.
Reposted by Frederik Dahl Madsen
🧑🔬 Are you an early career researcher?🧑🔬
If so, we'd love for you to attend our early career event next month. It will feature a careers panel, networking opportunities and a discussion about the importance of effective communication for sharing research.
Book your spot at: ras.ac.uk/early-career...
If so, we'd love for you to attend our early career event next month. It will feature a careers panel, networking opportunities and a discussion about the importance of effective communication for sharing research.
Book your spot at: ras.ac.uk/early-career...
October 27, 2025 at 1:07 PM
🧑🔬 Are you an early career researcher?🧑🔬
If so, we'd love for you to attend our early career event next month. It will feature a careers panel, networking opportunities and a discussion about the importance of effective communication for sharing research.
Book your spot at: ras.ac.uk/early-career...
If so, we'd love for you to attend our early career event next month. It will feature a careers panel, networking opportunities and a discussion about the importance of effective communication for sharing research.
Book your spot at: ras.ac.uk/early-career...
Cycling out and home from the @bgs.ac.uk Lyell Centre is a pleasure this time of year 🌈🌅
October 22, 2025 at 3:59 PM
Cycling out and home from the @bgs.ac.uk Lyell Centre is a pleasure this time of year 🌈🌅
Reposted by Frederik Dahl Madsen
Calling students from 14 - 19!
BGS & @bas.ac.uk are offering a 2 week virtual work experience event from 27 to 31 October.
We hope this will introduce students to the wonders of Earth sciences & the fascinating & varied careers available.
Apply:
sites.google.com/view/ctcport...
BGS & @bas.ac.uk are offering a 2 week virtual work experience event from 27 to 31 October.
We hope this will introduce students to the wonders of Earth sciences & the fascinating & varied careers available.
Apply:
sites.google.com/view/ctcport...
October 8, 2025 at 11:44 AM
Calling students from 14 - 19!
BGS & @bas.ac.uk are offering a 2 week virtual work experience event from 27 to 31 October.
We hope this will introduce students to the wonders of Earth sciences & the fascinating & varied careers available.
Apply:
sites.google.com/view/ctcport...
BGS & @bas.ac.uk are offering a 2 week virtual work experience event from 27 to 31 October.
We hope this will introduce students to the wonders of Earth sciences & the fascinating & varied careers available.
Apply:
sites.google.com/view/ctcport...
Reposted by Frederik Dahl Madsen
Published in #GJI Geophysical Journal International: "A recent interruption in the 6-year oscillation in length-of-day", Madsen & Holme. This is Fig. 1: read the paper at academic.oup.com/gji/article/... @oxfordacademic.bsky.social @royalastrosoc.bsky.social
October 3, 2025 at 7:14 AM
Published in #GJI Geophysical Journal International: "A recent interruption in the 6-year oscillation in length-of-day", Madsen & Holme. This is Fig. 1: read the paper at academic.oup.com/gji/article/... @oxfordacademic.bsky.social @royalastrosoc.bsky.social
🌍New Paper Alert🕰️
Our paper "A recent interruption in the 6-year oscillation in length-of-day" is finally out in #GJI @rasjournals.bsky.social.
Did you know that the length of a day changes every day?
We use this information to look at Earth's core.
#OpenAccess link here: doi.org/10.1093/gji/...
Our paper "A recent interruption in the 6-year oscillation in length-of-day" is finally out in #GJI @rasjournals.bsky.social.
Did you know that the length of a day changes every day?
We use this information to look at Earth's core.
#OpenAccess link here: doi.org/10.1093/gji/...
A recent interruption in the 6-year oscillation in length-of-day
SUMMARY. Intradecadal variations in the length-of-day ($\Delta$LOD) can reveal changes in angular velocity interpreted as due to Earth’s core. Previous stu
doi.org
September 18, 2025 at 1:20 PM
🌍New Paper Alert🕰️
Our paper "A recent interruption in the 6-year oscillation in length-of-day" is finally out in #GJI @rasjournals.bsky.social.
Did you know that the length of a day changes every day?
We use this information to look at Earth's core.
#OpenAccess link here: doi.org/10.1093/gji/...
Our paper "A recent interruption in the 6-year oscillation in length-of-day" is finally out in #GJI @rasjournals.bsky.social.
Did you know that the length of a day changes every day?
We use this information to look at Earth's core.
#OpenAccess link here: doi.org/10.1093/gji/...
A little geodetic content from Lisbon for @hughpumphrey.bsky.social - found this pillar in the castle! Presumably a benchmark of some kind
September 7, 2025 at 11:43 AM
A little geodetic content from Lisbon for @hughpumphrey.bsky.social - found this pillar in the castle! Presumably a benchmark of some kind
Reposted by Frederik Dahl Madsen
We are expecting an increase in geomagnetic activity over the next few days due to increased solar activity.
A coronal mass ejection (CME) is expected to arrive this evening making STORM periods likely, potentially peaking at moderate (G3) or strong (G4) levels.
A coronal mass ejection (CME) is expected to arrive this evening making STORM periods likely, potentially peaking at moderate (G3) or strong (G4) levels.
September 1, 2025 at 4:48 PM
We are expecting an increase in geomagnetic activity over the next few days due to increased solar activity.
A coronal mass ejection (CME) is expected to arrive this evening making STORM periods likely, potentially peaking at moderate (G3) or strong (G4) levels.
A coronal mass ejection (CME) is expected to arrive this evening making STORM periods likely, potentially peaking at moderate (G3) or strong (G4) levels.
First day of #IAGAIASPEI25 done! It was so exciting hear about so much cool science today 🌏🧭🧲
September 1, 2025 at 7:30 PM
First day of #IAGAIASPEI25 done! It was so exciting hear about so much cool science today 🌏🧭🧲
Arrived in Lisbon last night, super excited for #IAGAIASPEI25!
…now I’m just waiting for KLM to bring my luggage to Lisbon as well…
(Pastel de Nata to pass the time)
…now I’m just waiting for KLM to bring my luggage to Lisbon as well…
(Pastel de Nata to pass the time)
August 31, 2025 at 8:19 AM
Arrived in Lisbon last night, super excited for #IAGAIASPEI25!
…now I’m just waiting for KLM to bring my luggage to Lisbon as well…
(Pastel de Nata to pass the time)
…now I’m just waiting for KLM to bring my luggage to Lisbon as well…
(Pastel de Nata to pass the time)
Reposted by Frederik Dahl Madsen
Looking for funding for your outreach project or studies within astronomy and geophysics? We’re now accepting applications for our August grants round.
Learn more about the criteria and the application process at the link below ⤵️
ras.ac.uk/awards-and-g...
Learn more about the criteria and the application process at the link below ⤵️
ras.ac.uk/awards-and-g...
July 14, 2025 at 12:05 PM
Looking for funding for your outreach project or studies within astronomy and geophysics? We’re now accepting applications for our August grants round.
Learn more about the criteria and the application process at the link below ⤵️
ras.ac.uk/awards-and-g...
Learn more about the criteria and the application process at the link below ⤵️
ras.ac.uk/awards-and-g...
The amazing #Geophysics Treasure Hunt resource, developed by Esther Bull, is now available as an Open Educational Resource! It was a delight to supervise Esther, and I think the outcome was excellent!
#Outreach #OER #OpenEducation
#Outreach #OER #OpenEducation
This is a fab resource created by Esther Bull as part of the Geoscience Outreach course and then adapted by Sanika Prakash our Open Textbook intern. I love that it can be adapted for multiple learning levels!
#OER #OpenEducation
@fdmadsen.bsky.social!
#OER #OpenEducation
@fdmadsen.bsky.social!
Geophysics is the physics of how the earth works, uncovering what lies below our ground. This adaptable lesson plan (ages 6-14), includes an interactive ‘treasure hunt’ and experiments to develop understanding of geophysics.
#OER #STEM #ScienceEd #OutdoorLearning
open.ed.ac.uk/geophysics-e...
#OER #STEM #ScienceEd #OutdoorLearning
open.ed.ac.uk/geophysics-e...
July 9, 2025 at 11:13 AM
The amazing #Geophysics Treasure Hunt resource, developed by Esther Bull, is now available as an Open Educational Resource! It was a delight to supervise Esther, and I think the outcome was excellent!
#Outreach #OER #OpenEducation
#Outreach #OER #OpenEducation
Reposted by Frederik Dahl Madsen
📢 Leadership Update from SAGES!🌍
We’re thrilled to announce that Professor Brice Rea from the University of Aberdeen has been appointed as the new Director of SAGES, taking over in July 2025.
We’re thrilled to announce that Professor Brice Rea from the University of Aberdeen has been appointed as the new Director of SAGES, taking over in July 2025.
June 17, 2025 at 1:24 PM
📢 Leadership Update from SAGES!🌍
We’re thrilled to announce that Professor Brice Rea from the University of Aberdeen has been appointed as the new Director of SAGES, taking over in July 2025.
We’re thrilled to announce that Professor Brice Rea from the University of Aberdeen has been appointed as the new Director of SAGES, taking over in July 2025.
Such a good talk from @sfarleycharlie.bsky.social and Esther Bull on OERs - particularly for use as authentic assessment!
June 17, 2025 at 10:59 AM
Such a good talk from @sfarleycharlie.bsky.social and Esther Bull on OERs - particularly for use as authentic assessment!
Very excited for this talk!!
Looking forward to presenting this today with Esther, who’s own final project is currently being adapted to go up onto our Open.ed showcase and Tes.com curated collection.
June 17, 2025 at 10:44 AM
Very excited for this talk!!
Reposted by Frederik Dahl Madsen
Looking forward to presenting this today with Esther, who’s own final project is currently being adapted to go up onto our Open.ed showcase and Tes.com curated collection.
June 17, 2025 at 9:04 AM
Looking forward to presenting this today with Esther, who’s own final project is currently being adapted to go up onto our Open.ed showcase and Tes.com curated collection.
It’s #Conference time once again! This time, specifically on Assessment and Feedback at the @edinburgh-uni.bsky.social Learning and Teaching conference!
June 17, 2025 at 7:44 AM
It’s #Conference time once again! This time, specifically on Assessment and Feedback at the @edinburgh-uni.bsky.social Learning and Teaching conference!
Great video from my supervisor, Ciarán, on the largest recorded solar storm observed in western recorded history!
The most powerful geomagnetic storm on record, captured on a piece of paper 📜
We hold the magnetogram from the 1859 Carrington Event in our collections. Geophysicist Ciaran Beggan explains how these records help us understand extreme space weather.
Watch: youtu.be/eVKz5Vq3yT0
We hold the magnetogram from the 1859 Carrington Event in our collections. Geophysicist Ciaran Beggan explains how these records help us understand extreme space weather.
Watch: youtu.be/eVKz5Vq3yT0
The Most Powerful Geomagnetic Storm on Record
YouTube video by British Geological Survey
youtu.be
June 13, 2025 at 3:05 PM
Great video from my supervisor, Ciarán, on the largest recorded solar storm observed in western recorded history!
At long last, our paper on modelling geomagnetic jerks is published in its final form📔:
doi.org/10.1016/j.pe...
Here, we use the @esa.int #Swarm satellites to investigate the Earth’s outer core. We find that geomag. jerks are associated with core-surface pulses, which allows us to predict them!🌏🧲🧭
doi.org/10.1016/j.pe...
Here, we use the @esa.int #Swarm satellites to investigate the Earth’s outer core. We find that geomag. jerks are associated with core-surface pulses, which allows us to predict them!🌏🧲🧭
Redirecting
doi.org
June 5, 2025 at 5:29 PM
At long last, our paper on modelling geomagnetic jerks is published in its final form📔:
doi.org/10.1016/j.pe...
Here, we use the @esa.int #Swarm satellites to investigate the Earth’s outer core. We find that geomag. jerks are associated with core-surface pulses, which allows us to predict them!🌏🧲🧭
doi.org/10.1016/j.pe...
Here, we use the @esa.int #Swarm satellites to investigate the Earth’s outer core. We find that geomag. jerks are associated with core-surface pulses, which allows us to predict them!🌏🧲🧭