Juan Marín

I need my space.

[Juan Marín @juamarto]

Ad astra per aspera!

[NOAA Space Weather Prediction Center @NWSSWPC]

A new real-time solar wind viewer is now available on our webpage at https://t.co/CxVMJhZprU. The new display makes it much easier to modify timelines, switch between data source (ACE or DSCOVR), and more. The experimental phase of this product lasts to 30 June, 2026.

[Juan Marín @juamarto]

Calentando para el Mundial... #TheArtist

[Kiko Llaneras @kikollan]

¿Cómo se rastrea el brote hantavirus?

Se buscan pasajeros y contactos en una docena de países. Tres focos:

❌ Desembarcados (~30)
❌ Vuelos con enferma (~160)
✅ A bordo (~147)

Los últimos están controlados. Pero desembarcados y vuelos se movieron libres durante días. Hilo👇

[Kiko Llaneras @kikollan]

💰 ¿Suben los salarios en España?

En realidad llevan 30 años estancados. El sueldo medio real solo sube 5% desde 1995, frente al 31% de la OCDE.

Datos de sueldos, generaciones e impuestos:

[Pato Aviador @PatoAviador]

y 13.- El nombre de Komarov está grabado en una placa que el Apolo 15 dejó en la Luna en 1971. Junto a los de Grissom, White y Chaffee.

Cayeron para que otros pudieran llegar.

FIN hilo 🧶

[RockZone @RockZone]

"Tienen todos los recursos a su alcance para llevar el concierto por dónde les plazca". Crónica del concierto de @_RufusTFirefly_ en La Riviera de Madrid. https://t.co/lSIjC7Npvl

[Daniel Marín @Eurekablog]

¡Feliz Día de la Cosmonáutica! 65 años del lanzamiento del primer ser humano al espacio y a la órbita, Yuri Alexéievich Gagarin

[Juan Marín @juamarto]

@guardian_el_ A ver si nos las puede revisar a los dos y conseguimos un descuento. Totalmente identificado contigo.

[Juan Marín @juamarto]

@kikollan https://t.co/DttGglHFZW

[Juan Marín @juamarto]

@kikollan #peroCompensa

[Juan Marín @juamarto]

The artist #inProgress

[Vincent Ledvina @Vincent_Ledvina]

Why are we not preparing for a large geomagnetic storm even though we have seen one of the most active weeks of flaring activity of the solar cycle? I have seen this question either asked or many posts alluding to this subject this morning. AR 4366 is certainly creating a buzz! Let's unpack everything.

Flares are just bursts of electromagnetic radiation or light. They have no mass directly associated with them. It's like turning on a super bright flashlight and blinding your friend for a second... once the flare is over, the immediate effects from the flare are also over. Flares also travel at the speed of... light! From the Sun to the Earth, this takes about 8 minutes, but technically we don't know a flare has occured until we have seen it at Earth.

Why don't flares cause aurora? Because the aurora is not produced by electromagnetic radiation but rather chemical reactions involving particles or mass. Flares are massless. Their effects are myriad but the energy imparted to Earth is all in the form of radiation and on the dayside (you can't see a flare if you aren't facing the Sun).

What does cause aurora, specifically widespread auroras during geomagnetic storms are solar storms or CMEs. Of course, you can see the aurora without a CME, but I'm talking about the news-hyping, view-line-posting, camera-battery-charging kinds of events which many people associate with geomagnetic storms, X-flares, CMEs, etc.

CMEs have mass. Flares don't have mass. But flares can trigger CMEs to lift off or erupt into space. Sometimes these CMEs are directed at Earth, sometimes not. Sometimes there is a large flare and no CME is launched.

This means you can't look at your SpaceWeatherLive notifications of all these M- and X-class flares and immediately thinnk we are in store for some amazing aurora. Often times, yes, large flares are associated with CMEs. But, this active region is unfortunately trapping all the plasma (the fun stuff) inside its magnetic fields not letting it escape during flares.

Even the X-flare this morning did not see any CME produced. Beyond around X8, nearly all flares have some kind of CME - even the magnetic cage of AR 4366 isn't enough to contain the explosive nature of the flare, but even minor X-class flares which are still intense events haven't seemed to produce much.

Could the magnetic "cage" of AR 4366 open up allowing CMEs to suddenly start being produced? Sure, but there is no way to tell if that is going to start happening. The active region is surely in a great spot for some Earth-directed CME action, but whether it produces a CME or not is the real question.

So, when you see a flare notification on your phone, you need to check whether a CME was actually associated with that event. It's like seeing lightning during a thunderstorm and not having any rain or wind. Sure, lightning (analogous to a solar flare) is cool, but storm damage (widespread aurora) only happens when wind and rain are taking place. We've all seen a big storm move overhead or close by with tons of lightning but no wind or rain for it to actually matter. This situation is just like active regions producing solar flares with no CMEs to speak of... all bark and no bite!

If this post is news to you, check out my free e-book on aurora chasing which covers a lot of space weather basics: https://t.co/hRZXJPnyz2 . Inside, you will find a logic flow chart that you can use to track space weather events from flare to aurora (assuming a CME is launched).

[European Space Agency @esa]

We’re proud to stand shoulder to shoulder with our international partners in Artemis. Our European Service Module is at the heart of NASA’s Orion spacecraft. Together, we're extending humankind’s presence in space and demonstrating that multilateral and inclusive cooperation is vital for our future.

[Clemens Marschner @cmarschnerde]

The tower of Munich’s city hall contains a mechanical clock that, twice a day, shows the “Coopers’ Dance”, the dance of the barrel makers. Its story goes like this:

When a severe outbreak of the Black Death hit Munich in 1517, the coopers’ guild, after months of sickness, fear, and quarantine, is said to have taken to the streets to cheer people up and show that normal life could continue.

The dance involves a group dressed in red guild costumes, forming various apocryphal geometric patterns using green arches. A clown is usually involved, knocking on barrels, as well as the swinging of hoops with glasses attached to them.

Every seven years, this tradition is repeated in January and February. For six weeks, the group tours the city, holding up to 20 performances a day in schools and community centers. That’s how I first got to see them - in first grade.

The Schäfflertanz is a reminder that society can recover from epidemic trauma through solidarity, courage, and shared celebration - something we need in our times as well.

[Juan Marín @juamarto]

@alb_olmos Este libro lo recoge bien: https://t.co/GzRKRTpA3U

[Rahul 🍁 @astrorahul_]

Instead of scrolling through 5 second videos on this first day of the new year, enjoy one of my favourite clips from the Earth to the Moon. This is from Episode 5 about the LM. Challenge every requirement, simplify and delete until it hurts, rapid prototype and test, iterate.

[Manuel de BCN (Daniel Guillén) @Manuel_de_BCN]

Hay actores devorados por sus personajes más famosos y luego está Rowan Atkinson que es incapaz de convencer a la gente de que él es verdaderamente Mr. Bean.

Acabamos 2025 con un #MakeEmLaugh sobre la gran megaestrella de la comedia británica.

HILO🧵⤵️

[Kiko Llaneras @kikollan]

✨ El mundo no empeora, mejora.

No es perfecto; ni siquiera un buen lugar. Pero de los escenarios globales que hemos conocido (no imaginado o deseado), este es el mejor.

45 datos para empezar 2026 con optimismo👇

[Virusemergentes @Virusemergentes]

En 111 años la esperanza de vida al nacer en España ha pasado de 34,8 a 82,1 años gracias básicamente a:
✅Vacunas y medicamentos
✅Medicina perinatal
✅Higiene y salubridad
✅Seguridad alimentaria
Sin los laboratorios (que hay gente que pide cerrar) esto no hubiera sido posible

[NORAD Tracks Santa @NoradSanta]

🎥 Santa Cam: Madrid, Spain

Santa has arrived in Madrid, spreading holiday cheer across Spain! NORAD confirms his sleigh is moving swiftly across Europe.

🌐 Track Santa live at https://t.co/gSvRD6f7zW

#NORADTracksSanta #SantaCam #Madrid