Cédric Champeau

@melix.champeau.me

931 Followers 274 Following

He/Him. Software Engineer at #OracleLabs, formerly #Gradle. Amateur astronomer. Author of #JSolEx (solar image processing for spectroheliographs). Opinions are my own.

En haut, l'AFP annonce "Le géant français pétro-gazier TotalEnergies a annoncé jeudi le doublement de son bénéfice net au 2ème trimestre". Dessous, une brève de Libération "Incendies : progression alarmante en Gironde, le feu fixé dans le Var".
In the center, the blue "calamar" aka OU4, is surrounded by the "flying bat" red emission nebula (sh2-129).
A masked sun, highlighting the E corona
Un ourson en cire, qui a ramolli sous la chaleur. L'ourson s'est déformé et semble épuisé.
Vidéo montrant la rotation du soleil. Les régions actives sont encadrées, annotées avec leur numéro.
Conifère cramé
Arbuste déseché
The sun, masked artificially, and the E corona.
Une image du soleil. Le disque est masqué artificiellement. Autour, elle montre la couronne solaire chaude, dite couronne K, avec un niveau de détail important. Cette image a été obtenue depuis le sol, en dehors de toute éclipse.
Une photographie du soleil capturé en H-alpha, avec un SHG 700, une lunette SVBony SV48P 102mm. Stackée et traitée avec JSol'Ex
Taches solaires de la region active AR4478
Une vidéo montrant le spectre de la lumière du soleil. Elle est centrée sur une région active.
Un thermomètre indiquant 43 degrés sous abri.
Le soleil capturé en H-alpha. Image colorisée.
Lune du 26 mai 2026
A full-disk capture of the sun in H-alpha. A glow is visble around the disk, caused by dispersion of light in the clouds.
The sun in H-alpha. The image is processed to increase visibility of details (unsharp mask) and prominences.
Mémoire JVM 94/6144 MB CPU 0% Espace disque 9/95 GB
An animation showing the rotation of the sun on a period from March 29 to April 21, 2026.
An animation of the sun, using images captured with a spectroheliograph, in Calcium K.
A screenshot of the SpectroSolHub application, showing 4 imaging sessions with images of the sun.
A video showing the TamboUI TFX library effects.
A representation of the main CMS detector
A couple of graphs showing the velocity of the solar plasma, in km/s and degrees/day.
Conference speaker card. Name of the speaker: Cédric Champeau. Conference track : Mind the Geek Beginner level. JSol'Ex : solar image processing in Java Date: 10th February 2026 cern.voxxeddays.ch
A large field view of the flaming star nebula, also known as IC 405.
A terminal UI using JRatatui, a Java port of Ratatui.
An H-alpha image of the sun, stack of 6 images processed in JSol'Ex.
On the left, the images showing wobbling due to turbulence. On the right, the images corrected by JSol'Ex.
a 3d visualization of the spectral profile
A 3d view of the sun: the captured image was projected on a sphere to make it more realistic.
Sur cette image inversée, on distingue en foncé les régions actives. Les "nuages" blancs sont des filaments solaires, qui ne sont ni plus ni moins que des protubérances vues "de face".
Large solar eruption
The sun on December 3, 2025. A giant group of sunspots is visible on the South-East (bottom left). The region is surrounded with line patterns which recall the iron filings experiment.
Une tomographie solaire, qui permet, via de fausses couleurs, de refléter l'altitude de différentes régions de la chromosphère (en vert, plus profond, en rouge plus élevé, les filaments en pourpre).
Processed image of the sun in H-alpha
The sun in H-alpha
Comparison of total production during the year
CNEWS. "Il y a d'un côté la France des héros et de l'autre la France des salauds". Bruno Retailleau
Extrait du site de Nutella: "Nos noisettes proviennent principalement de Turquie, d'Italie et du Chili".
An image of the sun, showing the Helium D3
An image of the sun in H-alpha
Un mortier de 120mm. Source : https://fr.m.wikipedia.org/wiki/40e_r%C3%A9giment_d%27artillerie
Groupe la boutik
Friday, March 14, 2025, the GNOME free software platform community project was subject to a spam campaign on one of its public chat rooms. Pedocriminal content, photos of tortured animals and transmisogynistic messages were sent in mass by accounts taking the name of a well-known pro-trump fascist from Free Software communities. At the heart of this attack, violent messages essentializing trans women to mutilated bodies. Why was the GNOME project targeted? Because it defends values of inclusion and works actively to put them in place since a long time, through its code of conduct and involvement in programs such as Outreachy. Numerous members of the GNOME community and beyond have personally received these messages exposing them to violent and criminal content, including members of Solidaires Informatique. These conversation channels are a key tool for project workers and community members. Their goal is not only to hurt the most minoritized persons in the community, but to isolate them and exclude them from free software projects. It is not for the minoritized to leave these spaces but for extreme right-wing activists. It is worth noting the lack of moderation tools integrated into the core of the used messaging system, and the failure of third-party antispam tools put in place, we must no longer accept that tech-bros design communication tools without taking into account the advanced means of moderation constantly demanded by the most minoritized communities. But if the moderation tools have failed, let's not forget that the heart of the issue is the domination systems, racism, transphobia, misogyny and ableism which, crystallized in fascism, are at the heart of this attack. Let's protect the workers, let's protect our communities, let's build truly inclusive communication commons and repel fascism, as long as necessary
Dans une salle de classe, je montre au tableau des photos de planètes. Au premier plan, des élèves écoutent attentivement.
Guerre en Ukraine : La Russie considérera comme un "conflit armé direct" le déploiement de soldats de la paix sur le terrain...
Graphique du cours de l'action Tesla sur 5 ans. Elle montre une hausse régulière, avec un minimum en 2020, un minima local en 2023, une chute en 2025, mais le niveau de 2025 reste supérieur à celui de 2023. Sur 5 ans, la hausse est de 580%.
A "negative" view of the sun, in H-alpha
Une image solaire en H-alpha, prise le 4 mars 2025 avec un MLAstro SHG 700.
> The pursuit of science should be politically agnostic and it's tools available for all to use. If you present your programs on an open, public source such as GitHub your political views should not be be presented there. That is the reason I find your statement on GitHub for your JSolEx program as inappropriate. All voices have a right to be heard even those we disagree with. This is your statement which is inappropriate. First of all, I do not pretend to do science. Second, sorry for polluting the list, this will be my last message on the topic. I'm a software developer who writes astronomy software in his free time and provides it for free, where many others choose to sell theirs. On my end, what I think is inappropriate is nazi salutes. What is inappropriate is calling Zelenski a dictator. What is inappropriate is organizing an insurrection. What is inappropriate is grabbing ladies by the pu**y. What is inappropriate is censoring words like "female", "climate change", "transition", "gender", "diversity" from public statements but also scientific papers. What is inappropriate is calling for ethnic purification by deporting people from Gaza to create a "French Riviera". What is inappropriate is threatening the future of our children by denying climate change and drilling. So, is my statement inappropriate? Maybe, but I guess with less consequences than the inappropriate behaviors I listed. So this is not about a disagreement: I will not stand with facism and I have the right to say so. Science is not neutral, everything is political, this is about what we want for the future and I'm not the only one to think so: https://www.chemistryworld.com/news/aaas-leadership-speaks-out-against-trump-administrations-attacks-on-science/4020982.article or https://www.statnews.com/2025/02/03/trump-nobel-laureates-urge-national-academies-biotech-ceos-to-speak-out/
Personnalité poltique de l'année : Bruno Retailleau
An image of the sun, in continuum around the H-alpha line, where detected sunspots are highlighted and labelled automatically.
Thomas Hertzog - L'origine du temps Gabriel Chardin - Antimatière et gravité David Elbaz - A la recherche de l'univers invisible Fente Sol'Ex 7 microns Fente Star'Ex nouvelle version Supports de fentes
Une photographie du soleil, dans la raie spectrale H-alpha
Zoom on NGC 910 region