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American Focus > Blog > Tech and Science > 2 spacecraft caught the waves that might heat and accelerate the solar wind
Tech and Science

2 spacecraft caught the waves that might heat and accelerate the solar wind

Last updated: August 30, 2024 3:51 am
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2 spacecraft caught the waves that might heat and accelerate the solar wind
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The solar wind, a stream of charged particles released from the sun’s atmosphere, has been a subject of fascination for scientists since the Space Age began. It was always understood that the solar wind accelerates as it travels through the solar system, but recent observations have shown that its temperature drops at a slower rate than expected.

Researchers have previously observed Alfvén waves near the sun, which are oscillations in the magnetic fields of the plasma emanating from the sun. These waves, sometimes forming “switchbacks,” have the right energy to explain the discrepancies in the solar wind’s speed and temperature. However, direct evidence was lacking until the Parker Solar Probe and Solar Orbiter missions.

In a serendipitous encounter, Parker Solar Probe and Solar Orbiter both passed through the same region of the solar wind, allowing scientists to quantify the energy of the Alfvén waves. Parker measured the plasma stream at 1.4 million kilometers per hour, while Solar Orbiter found it to be traveling at 1.8 million km/h. The plasma temperature at Solar Orbiter was significantly higher than expected, indicating that the Alfvén waves had dissipated and injected energy into the solar wind.

This phenomenon is likened to flapping your hand in a wind tunnel, creating waves that mix energy with the surrounding air. While some scientists are skeptical and suggest that the measurements may not have accurately intercepted the same plasma stream, the researchers behind the study stand by their findings. They hope to further investigate the transfer of energy between the Alfvén waves and the solar wind to validate their observations.

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The discovery of the role of Alfvén waves in the acceleration and heating of the solar wind sheds new light on our understanding of this mysterious phenomenon. By continuing to study the intricate physics at play in the solar wind, scientists can unlock even more secrets about the sun’s influence on the space environment.

TAGGED:accelerateCaughtheatsolarspacecraftwaveswind
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