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SOLAR SCIENCE
Solar Orbiter ready to depart Europe
by Staff Writers
Paris (ESA) Oct 19, 2019

ESA's Solar Orbiter at IABG in Ottobrunn, Germany, before it starts its journey to Cape Canaveral in Florida, USA.

ESA's Solar Orbiter mission has completed its test campaign in Europe and is now being packed ready for its journey to Cape Canaveral at the end of this month, ahead of launch in February 2020.

The spacecraft was on display today for the final time in Europe, at the IABG test centre near Munich, Germany. It was built at Airbus Stevenage, UK, and has spent the last year at IABG undergoing essential testing such as checking deployment mechanisms, and that it can withstand the vibrations of launch, and the thermal extremes and vacuum of space. It has now been declared ready for shipment to the launch site and will travel an Antonov cargo plane on 31 October.

Once launched it will follow an elliptical path around the Sun, at its closest bringing it within the orbit of Mercury, just 42 million kilometres from the Sun. As such, Sun-facing parts of the spacecraft have to withstand temperatures of more than 500 degrees C - due to solar radiation thirteen times more intense than for Earth-orbiting satellites - while other parts remain in shadow at -180 degrees C.

The mission is essential to learn more about the Sun-Earth connection. We live inside a giant bubble of plasma generated by the Sun that surrounds the entire solar system, within which we are prey to space weather. Solar Orbiter will provide a deeper understanding as to how activity on the Sun is linked to these solar storms, which can disrupt electrical systems, satellite communications, GPS, and create higher doses of radiation for polar flights and astronauts.

"Solar Orbiter is set for answering some of the biggest scientific questions about our star, and its data will help us to better protect our planet from the global challenges of space weather," says Gunther Hasinger, ESA Director of Science.

"Thanks to the hard work of our teams building and testing this inspiring space mission, we've reached an important milestone today in Europe, and the spacecraft will now be readied for its final phase of pre-launch preparations at Cape Canaveral."

Solar Orbiter will launch on a NASA-provided Atlas V 411. The launch is currently scheduled in the early hours of 6 February (UTC). Once in space, and over the course of several years, it will use the gravity of Venus and Earth to raise its orbit above the poles of the Sun, providing new perspectives on our star, including the first images of the Sun's polar regions.

Its complementary suite of instruments means it will be able to study the plasma environment locally around the spacecraft, and collect data from the Sun from afar, connecting the dots between the Sun's activity, and the space environment in the inner solar system.

Solar Orbiter is an ESA mission with strong NASA participation. The prime contractor is Airbus Defence and Space in Stevenage, UK. It follows in the legacy of missions such as Ulysses (1990-2009) and SOHO (1995-present) and will also provide complementary datasets to NASA's Parker Solar Probe that will allow more science to be distilled from the two missions than either could achieve on their own.


Related Links
Solar Orbiter at ESA
Solar Science News at SpaceDaily


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SOLAR SCIENCE
Surveying solar storms by ancient Assyrian astronomers
Tsukuba, Japan (SPX) Oct 17, 2019
A research team led by the University of Tsukuba combined observations from ancient cuneiform tablets that mention unusual red skies with radioisotope data to identify solar storms that likely occurred around 679 to 655 BCE, prior to any previously datable events. This work may help modern astronomers predict future solar flares or coronal mass ejections that can damage satellite and terrestrial electronic devices. Humans have been looking to the skies for as long as we have been around. Some of t ... read more

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