León is using the upcoming solar eclipse for science and education: the European Space Agency (ESA) is cooperating with the city and the University of León to combine ground measurements with Earth observation data from space. The project aims to precisely capture the short-term changes caused by the sun’s shading and to give the public insight into the methods and benefits of modern Earth observation.
Measurements on the ground and from space
On the ground, temperature and radiation sensors, microclimate instruments, spectrometers, wind measurements and radiometers will be deployed. They document how quickly air and surfaces cool, how the stratification of the lower atmosphere changes and how clouds behave inside the moving shadow. Complementary meteorological balloons provide profiles of the vertical atmospheric structure.
Satellite observations expand the local perspective. They track the fast-moving shadow over land and clouds, map aerosols and measure responses in higher atmospheric layers. Together, these observations create a multidimensional picture of the response to a clearly defined, temporally limited radiative impulse.
Signals in the atmosphere and ionosphere
The abrupt decrease in solar radiation serves as a natural experiment to test atmospheric models. The focus is on temperature profiles in near-surface layers, changes in turbulence and the distribution of humidity. The altered stability can locally affect wind direction and speed — effects that are small-scale and short-lived and difficult to isolate in everyday weather.
The ionosphere responds as well. The reduced solar UV radiation temporarily lowers ionisation and generates wave-like disturbances. These can be tracked with GPS analyses, specialized radar data and ionospheric measurements, helping to improve models for short-term disruptions to navigation and communications.
Benefits for climate and energy research
The few minutes of an eclipse do not replace a climate trend, but they provide robust tests for model physics: parameterisations of radiation, turbulence and cloud formation can be constrained more precisely. That improves the representation of fast processes and feedbacks in climate and weather models.
The measurements are also relevant for energy systems. Photovoltaic and solar-thermal installations respond immediately to shading. Real data from an eclipse help calibrate forecasts for power input and support grid operators in testing strategies for short-term drops in generation.
Science to join in
The programme in León is also aimed at the public: lectures, exhibitions and safe live observations make the methods and goals of the measurement campaign accessible. In this way, applications of satellite technology and Earth observation become tangible for schools, universities and interested citizens.
Open data for the scientific community
Data collected during the solar eclipse are typically made available to the research community. That increases reproducibility and comparability, enables studies with other eclipses and strengthens the coupling of ground, balloon and satellite data for long-term atmospheric and climate research.
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