Savvas Raptis
@savvasraptis.bsky.social
Researcher at Johns Hopkins University Applied Physics Laboratory (JHUAPL): https://savvasraptis.github.io
A huge thanks to all participants for making the 3rd LMAG25 workshop a success! For anyone who wants to revisit the talks: The final program & presentation recordings are now available on our site: www.lmag25.com/presentations
#geospace #heliophysics #machinelearning
#geospace #heliophysics #machinelearning
November 5, 2025 at 4:13 PM
A huge thanks to all participants for making the 3rd LMAG25 workshop a success! For anyone who wants to revisit the talks: The final program & presentation recordings are now available on our site: www.lmag25.com/presentations
#geospace #heliophysics #machinelearning
#geospace #heliophysics #machinelearning
Yesterday I joined remotely a space weather AI/ML panel at #ESWW2025 in Umeå as a giant face on a screen.
Key takeaways: We need less hype, more rigor. Better validation, standardized benchmarks, and open access to models/data. Hope to join in-person next year😀!
Key takeaways: We need less hype, more rigor. Better validation, standardized benchmarks, and open access to models/data. Hope to join in-person next year😀!
October 31, 2025 at 1:44 PM
Yesterday I joined remotely a space weather AI/ML panel at #ESWW2025 in Umeå as a giant face on a screen.
Key takeaways: We need less hype, more rigor. Better validation, standardized benchmarks, and open access to models/data. Hope to join in-person next year😀!
Key takeaways: We need less hype, more rigor. Better validation, standardized benchmarks, and open access to models/data. Hope to join in-person next year😀!
Heading to Lisbon for #IAGA2025!
I'm giving three talks:
• Mon 17:15 (C.2.22): Particle acceleration at bow shocks
• Tue 11:45 (C.3.7): Storm-time plasma sheet convection
• Tue 16:30 (C.2.22): An update from the #NASA CGS drive center
Come say hi if you're around!
#Heliophysics #Geophysics
I'm giving three talks:
• Mon 17:15 (C.2.22): Particle acceleration at bow shocks
• Tue 11:45 (C.3.7): Storm-time plasma sheet convection
• Tue 16:30 (C.2.22): An update from the #NASA CGS drive center
Come say hi if you're around!
#Heliophysics #Geophysics
August 30, 2025 at 5:23 PM
Heading to Lisbon for #IAGA2025!
I'm giving three talks:
• Mon 17:15 (C.2.22): Particle acceleration at bow shocks
• Tue 11:45 (C.3.7): Storm-time plasma sheet convection
• Tue 16:30 (C.2.22): An update from the #NASA CGS drive center
Come say hi if you're around!
#Heliophysics #Geophysics
I'm giving three talks:
• Mon 17:15 (C.2.22): Particle acceleration at bow shocks
• Tue 11:45 (C.3.7): Storm-time plasma sheet convection
• Tue 16:30 (C.2.22): An update from the #NASA CGS drive center
Come say hi if you're around!
#Heliophysics #Geophysics
Reposted by Savvas Raptis
Know a dataset making an impact for people, planet, or prosperity?
🌎 Nominate it for AGU’s upcoming commentary by 10 Oct. You may be featured!
🔗: buff.ly/XLFfYqM
#ImpactfulData #EarthScience
🌎 Nominate it for AGU’s upcoming commentary by 10 Oct. You may be featured!
🔗: buff.ly/XLFfYqM
#ImpactfulData #EarthScience
Nominate an Impactful Dataset
You are invited to nominate a dataset to be included in a commentary about the impact of Earth, space, and environmental data using the dimensions of people, planet, and prosperity. Selected…
docs.google.com
August 12, 2025 at 6:39 PM
Know a dataset making an impact for people, planet, or prosperity?
🌎 Nominate it for AGU’s upcoming commentary by 10 Oct. You may be featured!
🔗: buff.ly/XLFfYqM
#ImpactfulData #EarthScience
🌎 Nominate it for AGU’s upcoming commentary by 10 Oct. You may be featured!
🔗: buff.ly/XLFfYqM
#ImpactfulData #EarthScience
Our session on the upcoming @agu.org Annual Meeting is open for abstract submission: "Collisionless Shocks in Heliospheric and Astrophysical Plasmas and their Effects on Planetary Magnetospheres".
Deadline: 30 July 2025 (23:59 EDT)
#AGU25 agu.confex.com/agu/agu25/pr...
Deadline: 30 July 2025 (23:59 EDT)
#AGU25 agu.confex.com/agu/agu25/pr...
Collisionless Shocks in Heliospheric and Astrophysical Plasmas and their Effects on Planetary Magnetospheres.
Collisionless shock waves are ubiquitous across the universe, manifesting in diverse astrophysical plasmas, from planetary environments to supernovas. Upstream of shocks, a variable foreshock emerges,...
agu.confex.com
July 15, 2025 at 5:28 PM
Our session on the upcoming @agu.org Annual Meeting is open for abstract submission: "Collisionless Shocks in Heliospheric and Astrophysical Plasmas and their Effects on Planetary Magnetospheres".
Deadline: 30 July 2025 (23:59 EDT)
#AGU25 agu.confex.com/agu/agu25/pr...
Deadline: 30 July 2025 (23:59 EDT)
#AGU25 agu.confex.com/agu/agu25/pr...
Reposted by Savvas Raptis
🧪 BREAKING (good news): Senate subcommittee says NO! to Trump's proposed slashes to NASA & NSF funding.
Today, the subcommittee said to keep NASA + NSF funding at $33.9 billion, the same as in FY24.
See 7:15 below. Full Senate appropriations committee meets tomorrow about it.
🧵 1/3
Today, the subcommittee said to keep NASA + NSF funding at $33.9 billion, the same as in FY24.
See 7:15 below. Full Senate appropriations committee meets tomorrow about it.
🧵 1/3
Subcommittee Markup of the Commerce, Justice, Science, and Related Agencies Appropriations Act | United States Senate Committee on Appropriations
United States Senate Committee on Appropriations
www.appropriations.senate.gov
July 10, 2025 at 12:23 AM
🧪 BREAKING (good news): Senate subcommittee says NO! to Trump's proposed slashes to NASA & NSF funding.
Today, the subcommittee said to keep NASA + NSF funding at $33.9 billion, the same as in FY24.
See 7:15 below. Full Senate appropriations committee meets tomorrow about it.
🧵 1/3
Today, the subcommittee said to keep NASA + NSF funding at $33.9 billion, the same as in FY24.
See 7:15 below. Full Senate appropriations committee meets tomorrow about it.
🧵 1/3
Reposted by Savvas Raptis
A large coronal hole is currently facing Earth! We may see high-speed solar winds and minor-moderate geomagneitc storms towards the end of the week.
#heliophysics
#heliophysics
July 1, 2025 at 5:07 PM
A large coronal hole is currently facing Earth! We may see high-speed solar winds and minor-moderate geomagneitc storms towards the end of the week.
#heliophysics
#heliophysics
Just came back from NSF/GEM 2025 last week in Iowa, Des Moines (gemworkshop.org)! Exciting talks, new ideas, and the launch of our focus group on Multiscale Dayside Transients. Had a great time with friends and colleagues and already looking forward to next time!
June 30, 2025 at 11:01 PM
Just came back from NSF/GEM 2025 last week in Iowa, Des Moines (gemworkshop.org)! Exciting talks, new ideas, and the launch of our focus group on Multiscale Dayside Transients. Had a great time with friends and colleagues and already looking forward to next time!
Reposted by Savvas Raptis
I'm excited to announce my passion project JourneyMon: Monster Trainer Roleplaying is coming soon to Kickstarter!
Be sure to follow our pre-launch page to keep up to date with the latest news!
www.kickstarter.com/projects/ilg...
Be sure to follow our pre-launch page to keep up to date with the latest news!
www.kickstarter.com/projects/ilg...
Coming soon: JourneyMon: Monster Trainer Roleplaying
A narrative, collaborative world-building TTRPG about friendship and monster battles.
www.kickstarter.com
June 24, 2025 at 3:26 PM
I'm excited to announce my passion project JourneyMon: Monster Trainer Roleplaying is coming soon to Kickstarter!
Be sure to follow our pre-launch page to keep up to date with the latest news!
www.kickstarter.com/projects/ilg...
Be sure to follow our pre-launch page to keep up to date with the latest news!
www.kickstarter.com/projects/ilg...
Reposted by Savvas Raptis
NASA Goddard is pushing through a 48% staff reduction!!! This could impact the upcoming Roman Space Telescope and many other future Astro missions. News coverage seems not sensational enough. Are we really going to let NASA (as we know it) die quietly? www.space.com/space-explor...
NASA begins push to slash workforce with more staff buyouts, early retirements as budget cuts loom
NASA employees have until July 25 to decide if they'll stay or go.
www.space.com
June 20, 2025 at 6:00 PM
NASA Goddard is pushing through a 48% staff reduction!!! This could impact the upcoming Roman Space Telescope and many other future Astro missions. News coverage seems not sensational enough. Are we really going to let NASA (as we know it) die quietly? www.space.com/space-explor...
Reposted by Savvas Raptis
You've heard about the catastrophic cuts to U.S. scientific leadership the Trump Administration has proposed.
This chart from Joshua Weitz (joshuasweitz.bsky.social) shows just how bad it is—funding levels for NASA, NSF, and NIH so low as to destroy science in America.
CALL YOUR REPRESENTATIVES!
This chart from Joshua Weitz (joshuasweitz.bsky.social) shows just how bad it is—funding levels for NASA, NSF, and NIH so low as to destroy science in America.
CALL YOUR REPRESENTATIVES!
June 5, 2025 at 1:00 AM
You've heard about the catastrophic cuts to U.S. scientific leadership the Trump Administration has proposed.
This chart from Joshua Weitz (joshuasweitz.bsky.social) shows just how bad it is—funding levels for NASA, NSF, and NIH so low as to destroy science in America.
CALL YOUR REPRESENTATIVES!
This chart from Joshua Weitz (joshuasweitz.bsky.social) shows just how bad it is—funding levels for NASA, NSF, and NIH so low as to destroy science in America.
CALL YOUR REPRESENTATIVES!
Reposted by Savvas Raptis
From Alaska and Hawaii to Florida and New York, scientists made their voices heard on Capitol Hill today—because the stakes are high. 🌎 🔭 🌌 🛰️
June 5, 2025 at 2:09 AM
From Alaska and Hawaii to Florida and New York, scientists made their voices heard on Capitol Hill today—because the stakes are high. 🌎 🔭 🌌 🛰️
Reposted by Savvas Raptis
Meet Smile.
The soon-to-be newest member of our space science mission fleet.
Employing X-ray and UV vision to see how Earth reacts to relentless streams and bursts of particles from the Sun.
Dive into the mission here 👉 www.esa.int/Science_Expl...
🔭🧪
#planetsci
The soon-to-be newest member of our space science mission fleet.
Employing X-ray and UV vision to see how Earth reacts to relentless streams and bursts of particles from the Sun.
Dive into the mission here 👉 www.esa.int/Science_Expl...
🔭🧪
#planetsci
June 4, 2025 at 1:01 PM
Meet Smile.
The soon-to-be newest member of our space science mission fleet.
Employing X-ray and UV vision to see how Earth reacts to relentless streams and bursts of particles from the Sun.
Dive into the mission here 👉 www.esa.int/Science_Expl...
🔭🧪
#planetsci
The soon-to-be newest member of our space science mission fleet.
Employing X-ray and UV vision to see how Earth reacts to relentless streams and bursts of particles from the Sun.
Dive into the mission here 👉 www.esa.int/Science_Expl...
🔭🧪
#planetsci
Reposted by Savvas Raptis
Inspired by @jtuttlekeane.bsky.social and @ohdearz.bsky.social, here's what the White House proposed budget cuts to NASA would do to the entirety of the agency's Science Mission Directorate.
Bloodbath is right.
Bloodbath is right.
May 31, 2025 at 3:00 AM
Inspired by @jtuttlekeane.bsky.social and @ohdearz.bsky.social, here's what the White House proposed budget cuts to NASA would do to the entirety of the agency's Science Mission Directorate.
Bloodbath is right.
Bloodbath is right.
Reposted by Savvas Raptis
I'm a current Harvard graduate student and I found out today that I had my NSF GRFP terminated without notification. I was awarded this individual research fellowship before even choosing Harvard as my graduate school
May 22, 2025 at 9:38 PM
I'm a current Harvard graduate student and I found out today that I had my NSF GRFP terminated without notification. I was awarded this individual research fellowship before even choosing Harvard as my graduate school
Had a fantastic week in Paris celebrating the 10th anniversary of #NASA's Magnetospheric Multiscale (MMS) mission 10thmmsanniv.sciencesconf.org !
The workshop featured excellent talks and discussions! Looking forward to next year’s gathering!
#heliophysics #research #space
The workshop featured excellent talks and discussions! Looking forward to next year’s gathering!
#heliophysics #research #space
10th MMS anniversary - 11th MMS community workshop - Sciencesconf.org
10thmmsanniv.sciencesconf.org
May 19, 2025 at 11:26 AM
Had a fantastic week in Paris celebrating the 10th anniversary of #NASA's Magnetospheric Multiscale (MMS) mission 10thmmsanniv.sciencesconf.org !
The workshop featured excellent talks and discussions! Looking forward to next year’s gathering!
#heliophysics #research #space
The workshop featured excellent talks and discussions! Looking forward to next year’s gathering!
#heliophysics #research #space
Great week at @iwf-oeaw.bsky.social, reconnected with friends and colleagues and had insightful discussions. Thanks for hosting! Looking forward to my next visit and to seeing you in Paris next week for the #MMS Anniversary Workshop. #Heliophysics #Collaboration
May 10, 2025 at 2:46 PM
Great week at @iwf-oeaw.bsky.social, reconnected with friends and colleagues and had insightful discussions. Thanks for hosting! Looking forward to my next visit and to seeing you in Paris next week for the #MMS Anniversary Workshop. #Heliophysics #Collaboration
Our collisionless shocks session at #EGU25 drew a great crowd, sparked insightful discussions and set the stage for new #heliophysics collaborations. Thanks to everyone that attended!
May 1, 2025 at 9:52 AM
Our collisionless shocks session at #EGU25 drew a great crowd, sparked insightful discussions and set the stage for new #heliophysics collaborations. Thanks to everyone that attended!
Arrived in Vienna yesterday for #EGU25! Ready for a week of #Heliophysics, science chats, and reconnecting with colleagues and friends. Let’s grab coffee if you’re around! Find more information about the program www.egu25.eu and if you are around, please come to my talks and presentations to chat!
April 27, 2025 at 6:08 PM
Arrived in Vienna yesterday for #EGU25! Ready for a week of #Heliophysics, science chats, and reconnecting with colleagues and friends. Let’s grab coffee if you’re around! Find more information about the program www.egu25.eu and if you are around, please come to my talks and presentations to chat!
Check our latest research using both #NASA and #ESA space missions on "Multimission Observations of Relativistic Electrons and High-speed Jets Linked to Shock-generated Transients"! doi.org/10.3847/2041... via ApJL of @aas.org #Heliophysics #Astrophysics
Multimission Observations of Relativistic Electrons and High-speed Jets Linked to Shock-generated Transients - IOPscienceSearchopens in new tab
Multimission Observations of Relativistic Electrons and High-speed Jets Linked to Shock-generated Transients, Raptis, Savvas, Lindberg, Martin, Liu, Terry Z., Turner, Drew L., Lalti, Ahmad, Zhou, Yufe...
doi.org
February 26, 2025 at 3:09 PM
Check our latest research using both #NASA and #ESA space missions on "Multimission Observations of Relativistic Electrons and High-speed Jets Linked to Shock-generated Transients"! doi.org/10.3847/2041... via ApJL of @aas.org #Heliophysics #Astrophysics
Reposted by Savvas Raptis
AGU stands with federal scientists. Read more on fromtheprow.agu.org/standing-tog...
February 14, 2025 at 6:01 PM
AGU stands with federal scientists. Read more on fromtheprow.agu.org/standing-tog...
Thrilled our research on electron acceleration is out in Nature Communications!
We show a cross-scale process accelerating electrons to very high energies, revealing how shocks act as natural accelerators across the Universe. www.nature.com/articles/s41...
#heliophysics #space #research
We show a cross-scale process accelerating electrons to very high energies, revealing how shocks act as natural accelerators across the Universe. www.nature.com/articles/s41...
#heliophysics #space #research
January 13, 2025 at 1:21 PM
Thrilled our research on electron acceleration is out in Nature Communications!
We show a cross-scale process accelerating electrons to very high energies, revealing how shocks act as natural accelerators across the Universe. www.nature.com/articles/s41...
#heliophysics #space #research
We show a cross-scale process accelerating electrons to very high energies, revealing how shocks act as natural accelerators across the Universe. www.nature.com/articles/s41...
#heliophysics #space #research
Our review paper on downstream jets is out! We summarize findings from 100s of articles on how jets form at collisionless shocks, their role in planetary systems, and their space weather effects. Many questions remain to explore! Read it here: link.springer.com/article/10.1...
#Heliophysics #Space
#Heliophysics #Space
Jets Downstream of Collisionless Shocks: Recent Discoveries and Challenges - Space Science Reviews
Plasma flows with enhanced dynamic pressure, known as magnetosheath jets, are often found downstream of collisionless shocks. As they propagate through the magnetosheath, they interact with the surrou...
link.springer.com
December 28, 2024 at 1:21 AM
Our review paper on downstream jets is out! We summarize findings from 100s of articles on how jets form at collisionless shocks, their role in planetary systems, and their space weather effects. Many questions remain to explore! Read it here: link.springer.com/article/10.1...
#Heliophysics #Space
#Heliophysics #Space
Another excellent day at #AGU24 today. Lots of great interaction at the #NASA CGS booth, and an engaging series of presentations on our collisionless shocks session.
Thanks to everyone who attended and contributed! Can't wait to continue our conversations in the upcoming days and future meetings!
Thanks to everyone who attended and contributed! Can't wait to continue our conversations in the upcoming days and future meetings!
December 12, 2024 at 1:12 AM
The second day of #AGU24 was amazing! It was great to see so many attendees visit the #NASA CGS booth. Thanks to everyone who stopped by and engaged with us!
Tomorrow, we’re excited to host the session on "Collisionless Shocks in Heliospheric and Astrophysical Plasmas." See you all there!
Tomorrow, we’re excited to host the session on "Collisionless Shocks in Heliospheric and Astrophysical Plasmas." See you all there!
December 11, 2024 at 1:43 AM