Cédric Champeau
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melix.champeau.me
Cédric Champeau
@melix.champeau.me
850 followers 220 following 500 posts
He/Him. Software Engineer at #OracleLabs, formerly #Gradle. Amateur astronomer. Author of #JSolEx. Opinions are my own.
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melix.champeau.me
Again nice prominences today on the Sun! Captured with an SHG 700 and processed/stacked using JSol'Ex!

#solar #astrophotography
Processed image of the sun in H-alpha An inverted version of the image in H-alpha. An image at the continuum around H-alpha (3Å) A Doppler image of the sun. A flare is visible on the right (West)
October 14, 2025 at 8:14 PM
melix.champeau.me
The sun captured in H-alpha late afternoon. Just had a few minutes so it's a stack of 5 images captured with the SHG 700 and entirely processed with JSol'Ex. The Doppler image shows interesting regions with high velocities! The active regions crop even shows Ellerman bombs! #solar #astronomy
The sun in H-alpha The sun in the continuum around H-alpha A Doppler image showing high velocities (the blue patch) A close up on active regions. Small white hot points are Ellerman bombs.
August 31, 2025 at 8:33 PM
melix.champeau.me
Right. Basically in my mind, you get gaussians. During the day, gaussian to the peak under ideal condition, and during the year, gaussian at peak month. See actual graphs from here.
Comparison of total production during the year Production during sunny day Production during average day (clouds and sun alternation) in summer
August 30, 2025 at 7:32 AM
melix.champeau.me
Same exists in Java
August 28, 2025 at 2:51 PM
melix.champeau.me
La binarisation typique de Trump, la simplification du vocabulaire (les méchants d'un côté, les gentils de l'autre) dans la bouche de Retailleau. Flippant notre époque.
CNEWS. "Il y a d'un côté la France des héros et de l'autre la France des salauds". Bruno Retailleau
July 25, 2025 at 6:52 AM
melix.champeau.me
Par ailleurs l'argument ne tient même pas la route de manière factuelle, lol.
Extrait du site de Nutella: "Nos noisettes proviennent principalement de Turquie, d'Italie et du Chili".
July 22, 2025 at 9:13 AM
melix.champeau.me
Last image before I pack everything. Helium D3 line.
An image of the sun, showing the Helium D3
June 20, 2025 at 8:12 AM
melix.champeau.me
An image of the sun captured from my backyards this morning, under good conditions. All processed with #JSolEx. It also automatically detected a couple of Ellerman Bombs. Science is fun! This afternoon I'm heading to Baron, Oise, in France, for JASON to meet with other solar observers!
An image of the sun in H-alpha Inverse version of the sun in H-alpha An image of the spectrum, showing an Ellerman Bomb An image of the spectrum, showing an Ellerman Bomb
June 20, 2025 at 7:06 AM
melix.champeau.me
On est d'accord qu'il y a 20 ans, des "tirs de mortier" on appelait ça des pétards ? Dans ma tête, un mortier c'est ça. Pas vraiment la même chose. A quel moment on a basculé ?
Un mortier de 120mm. Source : https://fr.m.wikipedia.org/wiki/40e_r%C3%A9giment_d%27artillerie
June 8, 2025 at 10:28 AM
melix.champeau.me
Le sosie de @sebi2706.bsky.social joue au #futuroscope
Groupe la boutik
April 20, 2025 at 9:43 AM
melix.champeau.me
Fascist attack against the Gnome project. Press release from Solidaires Informatique.
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
March 20, 2025 at 12:36 PM
melix.champeau.me
Hier j'ai eu le plaisir de rencontrer des jeunes élèves du CP au CM2, pour leur parler d'astronomie et d'astrophotographie. Beaucoup de questions, c'était super de voir leur curiosité. Malheureusement l'observation solaire prévue a été annulée faute de météo clémente.
Dans une salle de classe, je montre au tableau des photos de planètes. Au premier plan, des élèves écoutent attentivement. En extérieur, un groupe d'élèves autour d'un instrument solaire. Le temps est couvert, ne permettant pas de démonstration.
March 18, 2025 at 7:49 AM
melix.champeau.me
Bah oui, si vous mettez des soldats "de la paix", comment on va pouvoir rompre le cessez-le-feu, nous ? Bravo aux crétins qui donnent encore des excuses aux russes. Le message est assez clair ou pas ?
Guerre en Ukraine : La Russie considérera comme un "conflit armé direct" le déploiement de soldats de la paix sur le terrain...
March 13, 2025 at 11:02 AM
melix.champeau.me
Relativisons les "mauvaises performances" de Tesla en bourse. Certes, il y a une baisse sensible, mais on est encore très loin d'un effondrement.
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%. Cours de l'action de Ford. Elle montre un pic en 2022, mais une valeur relativement stable entre 2022 et 2025. Sur 5 ans, la hausse n'est que de 70%.
March 13, 2025 at 9:11 AM
melix.champeau.me
Et voici une version en "négatif"
A "negative" view of the sun, in H-alpha
March 4, 2025 at 10:06 PM
melix.champeau.me
Bon pour changer des nouvelles déprimantes du monde fasciste, une petite image solaire, prise de mon jardin avec un spectrohéliographe (à vos souhaits) et traitée avec mon soft maison (JSol'Ex 2.11.1 en l'occurrence).

#astrophotographie #solaire
Une image solaire en H-alpha, prise le 4 mars 2025 avec un MLAstro SHG 700. Une image du soleil prise le 4 Mars 2025, dans le continuum autour de H-alpha.
March 4, 2025 at 9:37 PM
melix.champeau.me
Eventually got someone complaining that I ask Trump and far right supporters to not use the software I write on my free time, evenings, nights and weekends (JSol'Ex). He finds my statement inappropriate. My answer below.
> 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/
February 21, 2025 at 11:31 PM
melix.champeau.me
Quand le sage montre la lune, l'idiot regarde le doigt.

Quand les français regardent Trump, ils ne voient pas Retailleau, Darmanin et la banalisation des idées d'extrême-droite. J'ai peur. La devise de la France, c'est "Liberté, Egalité, Fraternité", non ? Qui sont ceux qui n'aiment pas la France ?
Personnalité poltique de l'année : Bruno Retailleau Député de l'année: Jean-Philippe Tanguy
February 13, 2025 at 10:18 AM
melix.champeau.me
I have just released JSol'Ex 2.9, which integrates active areas detection. JSol'Ex is open source solar images processing software, which can process videos produced by the Sol'Ex spectroheliograph.

melix.github.io/astro4j/2.9....

#Solar #SolEx
An image of the sun, in continuum around the H-alpha line, where detected sunspots are highlighted and labelled automatically. An image of the spectrum, illustrating how detection is done.
January 31, 2025 at 9:37 PM
melix.champeau.me
Ce que j'ai ramené des #RCE2024, j'ai été raisonnable.
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
November 11, 2024 at 7:22 PM
melix.champeau.me
J'ai profité d'une trouée avant la prochaine tempête et d'une RTT pour prendre une photo du soleil. Voici donc le résultat, en H-alpha et légèrement décalé du H-alpha.

Pour tout ce qui est astronomie, mon compte principal c'est sur Mastodon -> astrodon.social/@melix
Une photographie du soleil, dans la raie spectrale H-alpha Le soleil, raie H-alpha décalée d'environ 0.5 Ångström Le soleil, version H-alpha colorisée
October 31, 2023 at 8:55 PM
melix.champeau.me
We tend to forget how incredible the equipment available to amateur astronomers is these days. In 1923, Edwin Hubble was the 1st to prove a galaxy existed outside of ours.

Here's a region centered around NGC 910 in the Andromeda constellation.

www.astrobin.com/full/bm7jz1/0/

#astrophotography
Zoom on NGC 910 region NGC 891 Wide field view around NGC 910
October 9, 2023 at 8:45 PM
melix.champeau.me
Pas plus haut que le bord, c'est la base !
Visuel de la campagne de santé publique France qui dit Boire aussi de l'eau quand on boit de l'alcool, c'est la base
September 26, 2023 at 12:18 PM
melix.champeau.me
The sun, August 24, using #SolEx. Full details here: astrodon.social/@melix/11094...
The sun, captured in H-alpha, on August 24, 2023.
August 24, 2023 at 4:55 PM