Dr Theodosios Chatzistergos
@damagedonegr.bsky.social
Researcher at Max Planck institute for solar system research.
Studying solar activity and variability.
I am not on x (twitter), my account there is deleted.
https://scholar.google.com/citations?user=8gnK6BsAAAAJ&hl=en
Studying solar activity and variability.
I am not on x (twitter), my account there is deleted.
https://scholar.google.com/citations?user=8gnK6BsAAAAJ&hl=en
Pinned
If you've heard the claim that the Sun is responsible for global warming in recent decades, you've likely encountered the Hoyt & Schatten 1993 (HS93) total solar irradiance (TSI) series cited to support this assertion. But, is this correct? [tldr: no]🧵
Πέφτουμε από τα σύννεφα...
Αυτό όμως που μου έκανε εντύπωση, και ελπίζω να κατάλαβα λάθος, είναι ότι, παρά όλα αυτά, το Πανεπιστήμιο Πατρών συνεχίζει να τον υπολογίζει ως διδακτορικό φοιτητή!
www.reportersunited.gr/17718/lobby-...
Αυτό όμως που μου έκανε εντύπωση, και ελπίζω να κατάλαβα λάθος, είναι ότι, παρά όλα αυτά, το Πανεπιστήμιο Πατρών συνεχίζει να τον υπολογίζει ως διδακτορικό φοιτητή!
www.reportersunited.gr/17718/lobby-...
Ο «ανεξάρτητος» Έλληνας γιατρός που πληρώθηκε από την πολυεθνική του ηλεκτρονικού τσιγάρου
O καρδιολόγος Κωνσταντίνος Φαρσαλινός, ένας από τους διασημότερους υπέρμαχους του ηλεκτρονικού τσιγάρου παγκοσμίως, έλαβε μέσω μυστικής εταιρείας στην Κύπρο χρήματα από τη μεγαλύτερη αμερικανική εταιρ...
www.reportersunited.gr
November 11, 2025 at 6:21 PM
Πέφτουμε από τα σύννεφα...
Αυτό όμως που μου έκανε εντύπωση, και ελπίζω να κατάλαβα λάθος, είναι ότι, παρά όλα αυτά, το Πανεπιστήμιο Πατρών συνεχίζει να τον υπολογίζει ως διδακτορικό φοιτητή!
www.reportersunited.gr/17718/lobby-...
Αυτό όμως που μου έκανε εντύπωση, και ελπίζω να κατάλαβα λάθος, είναι ότι, παρά όλα αυτά, το Πανεπιστήμιο Πατρών συνεχίζει να τον υπολογίζει ως διδακτορικό φοιτητή!
www.reportersunited.gr/17718/lobby-...
Reposted by Dr Theodosios Chatzistergos
Does the solar magnetic field migrate towards the poles faster than expected? Results using the data from #ESA ’s #SolarOrbiter are published today in #ApJL. More infos here: www.mps.mpg.de/sun-first-gl...
@science.esa.int @ioppublishing.bsky.social
@science.esa.int @ioppublishing.bsky.social
Sun: First Glimpse of Polar Magnetic Field in Motion
In March, ESA's spacecraft Solar Orbiter had its first clear view of the Sun’s south pole. A first analysis has now been published.
Huge cells of hot plasma cover the Sun and create the large-scale, ...
www.mps.mpg.de
November 5, 2025 at 3:16 PM
Does the solar magnetic field migrate towards the poles faster than expected? Results using the data from #ESA ’s #SolarOrbiter are published today in #ApJL. More infos here: www.mps.mpg.de/sun-first-gl...
@science.esa.int @ioppublishing.bsky.social
@science.esa.int @ioppublishing.bsky.social
The deadline for submission to the topical issue has been extended until 31 January 2026.
☀️🔭🧪
☀️🔭🧪
We are pleased to announce that the Topical Issue (TI) on “Space Climate: Solar Extremes, Long-Term Variability, and Impacts on Earth’s System” is now open for submissions at the Journal of Space Weather and Space Climate (JSWSC) site:
www.swsc-journal.org/topical-issu....
🧪🔭☀️
www.swsc-journal.org/topical-issu....
🧪🔭☀️
October 8, 2025 at 8:32 AM
The deadline for submission to the topical issue has been extended until 31 January 2026.
☀️🔭🧪
☀️🔭🧪
Reposted by Dr Theodosios Chatzistergos
Our comment to the DOE and EPA about the DOE Climate Working Group report is now posted on ESSOAR preprint server. It has a DOI and can now be cited!
essopenarchive.org/users/260056...
essopenarchive.org/users/260056...
September 30, 2025 at 2:54 PM
Our comment to the DOE and EPA about the DOE Climate Working Group report is now posted on ESSOAR preprint server. It has a DOI and can now be cited!
essopenarchive.org/users/260056...
essopenarchive.org/users/260056...
Reposted by Dr Theodosios Chatzistergos
Grateful to @andrewdessler.com for coordinating this (and keeping us on schedule)! I feel proud for having contributed to this monumental effort alongside some of my role models in this field. It felt necessary to respond to the report that was misleading at best and dangerous at worst.
Our 400+ page comment on the DOE climate working group report is now out.
Our conclusion: The merchants of doubt are back, and they're coming for climate science.
Our conclusion: The merchants of doubt are back, and they're coming for climate science.
DOEresponseSite
On July 29, 2025, the Department of Energy (DOE) published a report from its Climate Working Group (CWG). This report features prominently in the EPA's reconsideration of its 2009 Endangerment Finding. In response, over 85 scientists have come together to write a comprehensive review, which is
sites.google.com
September 2, 2025 at 4:10 PM
Grateful to @andrewdessler.com for coordinating this (and keeping us on schedule)! I feel proud for having contributed to this monumental effort alongside some of my role models in this field. It felt necessary to respond to the report that was misleading at best and dangerous at worst.
Reposted by Dr Theodosios Chatzistergos
Proud to be part of an effort by 85 scientists from around the world to respond to a misleading DOE climate science report last month.
The fact that our rebuttal is more than 3x the length of the DOE report is a good example of Brandolini's Law in action...
The fact that our rebuttal is more than 3x the length of the DOE report is a good example of Brandolini's Law in action...
DOEresponseSite
On July 29, 2025, the Department of Energy (DOE) published a report from its Climate Working Group (CWG). This report features prominently in the EPA's reconsideration of its 2009 Endangerment Finding. In response, over 85 scientists have come together to write a comprehensive review, which is
sites.google.com
September 2, 2025 at 5:28 PM
Proud to be part of an effort by 85 scientists from around the world to respond to a misleading DOE climate science report last month.
The fact that our rebuttal is more than 3x the length of the DOE report is a good example of Brandolini's Law in action...
The fact that our rebuttal is more than 3x the length of the DOE report is a good example of Brandolini's Law in action...
Reposted by Dr Theodosios Chatzistergos
There's a lot of very interesting material in the response from experts across many domains if you want to learn something solar reconstructions, coral reefs, U.S. temperature data, atmospheric temperature trends, climate models, etc. Andrew did a great job organizing with a very small (30d) window.
On The Climate Brink, I write about the DOE report and our response.
The merchants of doubt are back
But this time, it's the U.S. government pushing doubt
www.theclimatebrink.com
September 2, 2025 at 4:29 PM
There's a lot of very interesting material in the response from experts across many domains if you want to learn something solar reconstructions, coral reefs, U.S. temperature data, atmospheric temperature trends, climate models, etc. Andrew did a great job organizing with a very small (30d) window.
Reposted by Dr Theodosios Chatzistergos
Great article in the NYTimes about our comment to the DOE about their climate report.
Gift link:
www.nytimes.com/2025/09/02/c...
Gift link:
www.nytimes.com/2025/09/02/c...
Scientists Denounce Trump Administration’s Climate Report
www.nytimes.com
September 2, 2025 at 1:43 PM
Great article in the NYTimes about our comment to the DOE about their climate report.
Gift link:
www.nytimes.com/2025/09/02/c...
Gift link:
www.nytimes.com/2025/09/02/c...
Reposted by Dr Theodosios Chatzistergos
Our 400+ page comment on the DOE climate working group report is now out.
Our conclusion: The merchants of doubt are back, and they're coming for climate science.
Our conclusion: The merchants of doubt are back, and they're coming for climate science.
DOEresponseSite
On July 29, 2025, the Department of Energy (DOE) published a report from its Climate Working Group (CWG). This report features prominently in the EPA's reconsideration of its 2009 Endangerment Finding. In response, over 85 scientists have come together to write a comprehensive review, which is
sites.google.com
September 2, 2025 at 1:24 PM
Our 400+ page comment on the DOE climate working group report is now out.
Our conclusion: The merchants of doubt are back, and they're coming for climate science.
Our conclusion: The merchants of doubt are back, and they're coming for climate science.
Reposted by Dr Theodosios Chatzistergos
The Department of Energy hired five academics to raise doubts about climate change. 85+ climate experts (organized by @andrewdessler.com) reviewed their report. Our conclusion, detailed in 450 pages of analysis: it is biased, full of errors, and not fit to inform policy making.
DOEresponseSite
On July 29, 2025, the Department of Energy (DOE) published a report from its Climate Working Group (CWG). This report features prominently in the EPA's reconsideration of its 2009 Endangerment Finding...
sites.google.com
September 2, 2025 at 1:07 PM
The Department of Energy hired five academics to raise doubts about climate change. 85+ climate experts (organized by @andrewdessler.com) reviewed their report. Our conclusion, detailed in 450 pages of analysis: it is biased, full of errors, and not fit to inform policy making.
Reposted by Dr Theodosios Chatzistergos
Our comment on the DOE CWG report is done. It tips the scales at 439 pages, approx. 3x longer than the DOE report.
This is related to Brandolini's law: The amount of energy needed to refute bullshit is an order of magnitude bigger than that needed to produce it.
Example: refuting one sentence.
This is related to Brandolini's law: The amount of energy needed to refute bullshit is an order of magnitude bigger than that needed to produce it.
Example: refuting one sentence.
August 28, 2025 at 1:13 AM
Our comment on the DOE CWG report is done. It tips the scales at 439 pages, approx. 3x longer than the DOE report.
This is related to Brandolini's law: The amount of energy needed to refute bullshit is an order of magnitude bigger than that needed to produce it.
Example: refuting one sentence.
This is related to Brandolini's law: The amount of energy needed to refute bullshit is an order of magnitude bigger than that needed to produce it.
Example: refuting one sentence.
Reposted by Dr Theodosios Chatzistergos
We are pleased to announce that the Topical Issue (TI) on “Space Climate: Solar Extremes, Long-Term Variability, and Impacts on Earth’s System” is now open for submissions at the Journal of Space Weather and Space Climate (JSWSC) site:
www.swsc-journal.org/topical-issu....
🧪🔭☀️
www.swsc-journal.org/topical-issu....
🧪🔭☀️
February 26, 2025 at 9:45 AM
We are pleased to announce that the Topical Issue (TI) on “Space Climate: Solar Extremes, Long-Term Variability, and Impacts on Earth’s System” is now open for submissions at the Journal of Space Weather and Space Climate (JSWSC) site:
www.swsc-journal.org/topical-issu....
🧪🔭☀️
www.swsc-journal.org/topical-issu....
🧪🔭☀️
Reposted by Dr Theodosios Chatzistergos
Could the #Sun be responsible for #ClimateChange? In his #TEDx talk on the subject, #mpsgoettingen director Sami Solanki looks into our star’s capricious past, at its more recent behavior – and gives a clear and definite answer. View here: www.youtube.com/watch?v=bQ21...
Could the sun be responsible for climate change? | Dr. Sami K. Solanki | TEDxHHN
YouTube video by TEDx Talks
www.youtube.com
August 22, 2025 at 10:34 AM
Could the #Sun be responsible for #ClimateChange? In his #TEDx talk on the subject, #mpsgoettingen director Sami Solanki looks into our star’s capricious past, at its more recent behavior – and gives a clear and definite answer. View here: www.youtube.com/watch?v=bQ21...
Reposted by Dr Theodosios Chatzistergos
#ParkerSolarProbe was in the right place at the right time in Sept 2022: It passed through a magnetic reconnection region in the Sun's corona. #SolarOrbiter observed the event from a distance. Study led by #SwRI in
@natastron.nature.com
. #NASA
@science.esa.int
www.mps.mpg.de/flying-throu...
@natastron.nature.com
. #NASA
@science.esa.int
www.mps.mpg.de/flying-throu...
August 28, 2025 at 6:34 AM
#ParkerSolarProbe was in the right place at the right time in Sept 2022: It passed through a magnetic reconnection region in the Sun's corona. #SolarOrbiter observed the event from a distance. Study led by #SwRI in
@natastron.nature.com
. #NASA
@science.esa.int
www.mps.mpg.de/flying-throu...
@natastron.nature.com
. #NASA
@science.esa.int
www.mps.mpg.de/flying-throu...
Reposted by Dr Theodosios Chatzistergos
And here's a video of the flare!
August 15, 2025 at 10:27 AM
And here's a video of the flare!
Reposted by Dr Theodosios Chatzistergos
Here are some great shots from our #GREGORSolarTelescope observation campaign in July. Peering into the #photosphere and #chromosphere, we caught several emerging active regions – and a #flare! This will help us study the plasma dynamics in active regions and how energy builds up to create a flare.
August 15, 2025 at 10:27 AM
Here are some great shots from our #GREGORSolarTelescope observation campaign in July. Peering into the #photosphere and #chromosphere, we caught several emerging active regions – and a #flare! This will help us study the plasma dynamics in active regions and how energy builds up to create a flare.
A quick reminder that the claim that "TSI
variability can explain more than 70% of the temperature variability since preindustrial times" is based on outdated and implausible TSI models. Thus, it is a misleading statement.
link.springer.com/article/10.1...
www.sciencedirect.com/science/arti...
variability can explain more than 70% of the temperature variability since preindustrial times" is based on outdated and implausible TSI models. Thus, it is a misleading statement.
link.springer.com/article/10.1...
www.sciencedirect.com/science/arti...
July 30, 2025 at 7:38 AM
A quick reminder that the claim that "TSI
variability can explain more than 70% of the temperature variability since preindustrial times" is based on outdated and implausible TSI models. Thus, it is a misleading statement.
link.springer.com/article/10.1...
www.sciencedirect.com/science/arti...
variability can explain more than 70% of the temperature variability since preindustrial times" is based on outdated and implausible TSI models. Thus, it is a misleading statement.
link.springer.com/article/10.1...
www.sciencedirect.com/science/arti...
Reposted by Dr Theodosios Chatzistergos
"It's Alive!" — Yes, after a break, Living Reviews in Solar Physics has resumed publication:
Greg Kopp. Solar irradiance measurements. #LivingRevSolPhys 22, 1 (2025). doi.org/10.1007/s411... #OpenAccess #Review @laspatcu.bsky.social
Greg Kopp. Solar irradiance measurements. #LivingRevSolPhys 22, 1 (2025). doi.org/10.1007/s411... #OpenAccess #Review @laspatcu.bsky.social
July 11, 2025 at 6:26 PM
"It's Alive!" — Yes, after a break, Living Reviews in Solar Physics has resumed publication:
Greg Kopp. Solar irradiance measurements. #LivingRevSolPhys 22, 1 (2025). doi.org/10.1007/s411... #OpenAccess #Review @laspatcu.bsky.social
Greg Kopp. Solar irradiance measurements. #LivingRevSolPhys 22, 1 (2025). doi.org/10.1007/s411... #OpenAccess #Review @laspatcu.bsky.social
Reposted by Dr Theodosios Chatzistergos
The German radio station "Bayern 2" has devoted the latest episode of its show “IQ” to the #Sun - and to Solar Orbiter’s first views of the solar poles. Interview partner is Sami Solanki of #mpsgoettingen : www.ardaudiothek.de/episode/urn:... In German. Enjoy!
#SolarOrbiter @science.esa.int
#SolarOrbiter @science.esa.int
Podcast: Magnetfeld der Sonne - Ist das ihr letztes Rätsel?
Die Sonne ist ein lebendiger Stern: Die Oberfläche brodelt, Sonnenflecken tauchen auf und vergehen, Eruptionen schleudern Ströme geladener Teilchen ins All. Sogar ihr Magnetfeld dreht sich regelmäßig ...
www.ardaudiothek.de
July 11, 2025 at 10:54 AM
The German radio station "Bayern 2" has devoted the latest episode of its show “IQ” to the #Sun - and to Solar Orbiter’s first views of the solar poles. Interview partner is Sami Solanki of #mpsgoettingen : www.ardaudiothek.de/episode/urn:... In German. Enjoy!
#SolarOrbiter @science.esa.int
#SolarOrbiter @science.esa.int
Reposted by Dr Theodosios Chatzistergos
🧵
Did you know that sunspots, those dark "marks" on the Sun surface have been observed for over 400 years?
They are the key to studying solar activity, but combining them into a single story is a challenge!
A new study has tested methods for "calibrating" this historical data, collected by
🔭 🧪
Did you know that sunspots, those dark "marks" on the Sun surface have been observed for over 400 years?
They are the key to studying solar activity, but combining them into a single story is a challenge!
A new study has tested methods for "calibrating" this historical data, collected by
🔭 🧪
New paper alert 🧪☀️☄️
In this study, we assessed different methods of combining sunspot number records from various observers, which will strengthen our ability to construct a consistent solar activity history.
doi.org/10.1051/0004...
In this study, we assessed different methods of combining sunspot number records from various observers, which will strengthen our ability to construct a consistent solar activity history.
doi.org/10.1051/0004...
July 8, 2025 at 7:32 AM
🧵
Did you know that sunspots, those dark "marks" on the Sun surface have been observed for over 400 years?
They are the key to studying solar activity, but combining them into a single story is a challenge!
A new study has tested methods for "calibrating" this historical data, collected by
🔭 🧪
Did you know that sunspots, those dark "marks" on the Sun surface have been observed for over 400 years?
They are the key to studying solar activity, but combining them into a single story is a challenge!
A new study has tested methods for "calibrating" this historical data, collected by
🔭 🧪
New paper alert 🧪☀️☄️
In this study, we assessed different methods of combining sunspot number records from various observers, which will strengthen our ability to construct a consistent solar activity history.
doi.org/10.1051/0004...
In this study, we assessed different methods of combining sunspot number records from various observers, which will strengthen our ability to construct a consistent solar activity history.
doi.org/10.1051/0004...
July 7, 2025 at 6:14 AM
New paper alert 🧪☀️☄️
In this study, we assessed different methods of combining sunspot number records from various observers, which will strengthen our ability to construct a consistent solar activity history.
doi.org/10.1051/0004...
In this study, we assessed different methods of combining sunspot number records from various observers, which will strengthen our ability to construct a consistent solar activity history.
doi.org/10.1051/0004...
Willie Soon's latest video is a textbook case of climate-change propaganda.
This short clip shows him making outrageously misleading claims about the Sun.
🧵🧪 #climatechange
This short clip shows him making outrageously misleading claims about the Sun.
🧵🧪 #climatechange
June 26, 2025 at 12:57 PM
Willie Soon's latest video is a textbook case of climate-change propaganda.
This short clip shows him making outrageously misleading claims about the Sun.
🧵🧪 #climatechange
This short clip shows him making outrageously misleading claims about the Sun.
🧵🧪 #climatechange
Reposted by Dr Theodosios Chatzistergos
We are looking forward to welcoming you! All of the #MPSGoettingen 's around 300 employees are helping, and most of us gathered for this group picture yesterday to mark the kick-off of the final preparation phases for this year's Night of Science. See you soon @ndw-goe.bsky.social
June 20, 2025 at 7:31 PM
We are looking forward to welcoming you! All of the #MPSGoettingen 's around 300 employees are helping, and most of us gathered for this group picture yesterday to mark the kick-off of the final preparation phases for this year's Night of Science. See you soon @ndw-goe.bsky.social
Reposted by Dr Theodosios Chatzistergos
Explore past and future climate on your PlayStation.
Including CRU-TS observational data from Climatic Research Unit @uniofeastanglia.bsky.social @climateuea.bsky.social
Including CRU-TS observational data from Climatic Research Unit @uniofeastanglia.bsky.social @climateuea.bsky.social
🌎 Climate Station launches today on PS5 and #PSVR2, transforming decades of complex climate science into an immersive, interactive story: play.st/4edqM2G
June 18, 2025 at 4:08 PM
Explore past and future climate on your PlayStation.
Including CRU-TS observational data from Climatic Research Unit @uniofeastanglia.bsky.social @climateuea.bsky.social
Including CRU-TS observational data from Climatic Research Unit @uniofeastanglia.bsky.social @climateuea.bsky.social