Time and visibility
On the evening of 12 August 2026 Europe will experience a solar eclipse. From around 19:30 CEST the obscuration will begin, and a narrow path of totality will run across Spain. Within this corridor the solar disk will be completely covered by the Moon for a few minutes. Outside the path of totality the eclipse will be partial, with the degree of coverage varying by location.
ESA live coverage
The European Space Agency (ESA) will accompany the event with a live broadcast from the Observatorio Astrofísico de Javalambre. Experts will explain the progression, the physical background and the instruments being used. At the same time a science programme with experiments and safe viewing opportunities will take place in León at the Palacio de Congresos y Exposiciones.
What becomes visible during totality
When the Moon moves exactly between Earth and Sun it blocks the bright photosphere. During totality the corona — the Sun's outer atmosphere — becomes visible. Its structure provides clues about magnetic fields, particle flows and temperature distributions, and can be studied particularly well during these minutes.
Rapid responses of the Earth's atmosphere
The sudden dimming triggers measurable changes: near-surface air cools briefly, wind fields adjust, and the ionosphere shows changes in electron density. These rapid signals help to improve understanding of the coupling between radiation, weather and upper atmospheric layers and complement long-term observation records.
Why researchers are watching closely
Totality creates rare conditions that outside an eclipse are usually only reachable with complex instruments. Typical research focuses include: – Corona research: direct observations support understanding of the solar wind and coronal mass ejections — central to space weather. – Atmospheric responses: short-term temperature and flow changes test assumptions about interactions between radiative forcing and local weather processes. – Ionosphere: GNSS and other measurements record how electron density changes in response to the darkness. – Calibration: the strong contrast in brightness helps to check optical sensors and radiometers and to validate models.
Satellites and measurement networks
Satellites provide the large-scale perspective while ground-based installations supply detailed data. Together they show how the eclipse effects propagate across different altitudes and regions.
Safe observing
Looking at the Sun without protection can cause permanent eye damage. Certified eclipse glasses or projection techniques (for example pinhole projection or suitable telescope adapters) are recommended. Only during true totality — when the solar disk is completely covered — may the corona be viewed briefly without protection. Before and after totality protective measures are mandatory again. Weather can obstruct the view; live broadcasts then offer a reliable alternative.
Impacts on everyday life and technology
Short-term dips in solar power output are possible and are planned for by grid operators. Air traffic and critical infrastructures also take the temporary changes in light and temperature into account. Analyses combine satellite data and local measurement series to capture spatial patterns and temporal sequences precisely.
An event for science and the public
12 August 2026 links a rare celestial event with wide-ranging public outreach: ESA's live programmes explain the background while research teams exploit the unique measurement windows. Those not inside the path of totality can follow the event via broadcast.