Italian Scientists Test Circular Slit Spectrometer During Total Solar Eclipse

Italian scientists have transported a revolutionary spectrometer to the Javalambre Observatory in Spain for a definitive test during the total solar eclipse on August 12. The instrument, called CISS, promises to capture the entire solar corona in a single image, but there will be no second chance.

• The CISS spectrometer will use a circular slit to photograph the entire ring of the corona at once.
• The test will take place during the total solar eclipse on August 12 at the Javalambre Observatory.
• Artificial eclipses created by satellites offer an alternative, but they cannot replicate the complete view of a natural eclipse.

A group of Italian researchers has embarked on a road trip to Spain with a newly designed solar instrument. The device, called the circular slit spectrometer (CISS), is ready for a crucial test: capturing the complete spectrum of the solar corona during the total eclipse that will cross Europe on August 12.

The CISS has been transported with extreme care, avoiding air transport due to the risk of damage. Scientists will install it at the Javalambre Astrophysical Observatory, located along the path of totality.

The mission is high-risk: the test must work on the first attempt, as the total eclipse will last only a couple of minutes. There is no room for error or a second take, reports The Next Web.

The scientific team hopes that this instrument will provide a fundamental advance in the observation of the solar corona, a region that is normally hidden by the brightness of the Sun.

The choice of a natural eclipse as a testing ground responds to the fact that these events remain invaluable for astrophysics, despite advances in space technology.

Why Are Eclipses Unique Laboratories?

The solar corona is the outer atmosphere of the Sun, extending millions of kilometers into space. Its temperature exceeds one million degrees, but its light is a million times weaker than that of the solar disk, making it invisible to the naked eye.

During a total eclipse, the Moon completely blocks the light from the solar disk, allowing the corona to be seen as a bright white halo. This natural phenomenon provides an exceptional window to study the structure and dynamics of that region.

Scientists have pursued eclipses for centuries, traveling to remote locations to take advantage of these minutes of darkness. Despite space missions, natural eclipses remain irreplaceable for certain studies.

The reason is that the inner corona, closest to the Sun's surface, is difficult to observe with instruments that artificially block the disk. The light scattered by these instruments often contaminates the measurements.

The natural eclipse provides a cleaner and more complete blockage, allowing the study of regions that are otherwise inaccessible. That is why the CISS was designed to make the most of this event.

The Innovative Design of the CISS

The CISS is not a coronagraph, as it does not create an artificial eclipse by blocking the disk. Instead, it is a spectrometer that splits the light from the corona into its wavelengths, revealing information about temperature, composition, and solar wind.

The novelty lies in its geometry: instead of using a linear slit like conventional spectrometers, it employs a circular slit. This allows capturing the spectrum of the entire ring of the corona in a single photograph.

Traditional linear spectrometers scan the corona strip by strip, a process that can take hours. During a total eclipse lasting only two minutes, that method is simply unfeasible.

The circular slit solves this problem, as it obtains information from the entire ring simultaneously. Thus, the CISS can make the most of the limited time of totality.

Paola Zuppella, principal investigator at the Institute of Photonics and Nanotechnologies in Padua, summarized the situation with a striking phrase: "There is no space or time for the unexpected." This is the spirit of the mission.

The Team Behind the Project

The CISS project is the result of collaboration between two Italian institutions. The Astrophysical Observatory of Turin leads the scientific part, under the direction of Federico Landini, while the Padua laboratory provides the optics for the instrument.

The team has worked for years on the design and construction of the spectrometer, overcoming multiple technical challenges. The complexity of the circular slit required precise polishing and alignment to ensure image quality.

Landini highlights the potential of the device: "In a single shot, we can obtain what older systems would take all morning to assemble." This efficiency is key for future solar observation missions.

The instrument was transported by road from Italy to Spain to avoid vibrations and shocks that could misalign its components. The journey was carefully planned to ensure the team arrived with enough time for installation.

Once at the observatory, researchers conducted alignment and calibration tests, hoping that weather conditions would be favorable on the day of the eclipse. Any cloud could ruin the observation.

Artificial Eclipses: The Space Alternative

While terrestrial scientists rely on a natural phenomenon, European space agencies are developing artificial eclipses using satellites. Two spacecraft in precise formation can create an eclipse on demand, with a shadow projected from one to the other.

This approach allows for the study of the corona without waiting for nature to cooperate. Images of the corona have already been obtained using this technique, representing a significant advancement.

The advantage of artificial eclipses is their repeatability and availability. Scientists can schedule observations at any time, without depending on the chance of a natural eclipse.

However, artificial eclipses cannot fully replicate the observation of a natural eclipse. The inner corona, in particular, is more accessible during a real eclipse because the light scattered by the coronagraph contaminates the measurements.

An instrument like the CISS, if it works correctly, could provide complementary data that satellites cannot obtain. The combination of both approaches could give a more complete view of the Sun.

Complementarity and Future

The relationship between natural and artificial eclipses is not one of competition, but of complementarity. While satellites offer consistency and continuous access, natural eclipses provide a cleaner and more complete view of the inner corona.

If the CISS passes the test, it would become an invaluable tool for future observation campaigns. Its ability to capture the full spectrum in a single shot could revolutionize the way the Sun is studied.

The data obtained during the eclipse could help better understand solar wind, coronal mass ejections, and other phenomena that affect space weather and technology on Earth.

However, it all depends on that crucial moment. The Javalambre team knows there is no margin for error: the Sun will not wait, and the weather could play against them.

The history of science is full of experiments that failed on the first attempt, but also of unexpected triumphs. The CISS represents the boldness of Italian research, betting on innovation in a field where margins are minimal.

The Final Challenge

The total eclipse on August 12 will be visible in much of Europe, but the CISS team has a unique opportunity. If clouds appear or the instrument fails, they will have to wait for the next eclipse, which is years away.

The pressure is immense, and the scientists know it. They have taken all possible precautions, from road transport to laboratory tests, to minimize risks.

The appointment with destiny is scheduled: when the Moon covers the Sun, the CISS will point from Spain, capturing the light of the corona in an instant. The entire team will hold their breath during those minutes.

If all goes well, the world of solar physics will have a new tool to explore the Sun, and the name of CISS will be recorded in history books. If not, it will serve as a reminder of how relentless nature can be.

Italian researchers trust in their ingenuity and the robustness of the instrument. As Zuppella said, there is no room for the unexpected, but science always holds surprises.

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