The Sun is surrounded by a ring of dust, made of the cosmic crumbs of collisions that formed planets, asteroids, comets and other celestial bodies billions of years ago. Image credit: ESO/Y.Beletsky
Washington: Troves of new data from a NASA probe's close encounters with the sun are giving scientists unique insight about the solar wind and space weather more generally as the spacecraft zooms through the outermost part of the star's atmosphere.
Researchers described the first published findings from the Parker Solar Probe, a spacecraft launched in 2018 to journey closer to the sun than any other human-made object. The findings, offering fresh details about how the sun spawns space weather, are reshaping astronomers understanding of violent Solar wind that can hamper satellites and electronics on Earth.
Scientists explained "Some of the information that we found pretty much confirmed what we expected, but some of it is totally unexpected."
Earth is roughly 93 million miles from the sun. The probe ventured as close as 15 million miles (24 million km) to the sun to gather the data used in the studies published in the journal Nature.
The probe eventually will travel within about 4 million miles (6 million km) from the suns surface, seven times closer than any previous spacecraft.
The probe has endured extreme heat while flying through the outermost part of the suns atmosphere, called the solar corona, that gives rise to Solar wind - the hot, energized, charged particles that stream outward from the Sun and fill the solar system.
Oscillations in the speed of these charged particles beaming outward from the solar corona have previously been thought to dissipate gradually, much like the waves seen after plucking a guitar string fading from the middle.
One of the probes "really big surprises," according to one of the researchers, was the detection of sudden, abrupt spikes in the speed of the Solar wind that were so violent that the magnetic field flips itself around, a phenomenon called "switchbacks."
"We're finding these discrete, powerful waves that wash over the spacecraft, kind of like rogue waves in an ocean," said Justin Kasper, a principal investigator whose team at the University of Michigan built a Solar wind-sensing instrument on the Parker probe. "They carry a tremendous amount of energy."
"This will dramatically change our theories for how the corona and Solar wind are being heated," Kasper added.
NASA launched the probe (the size of a small car) into the orbit of the sun in August 2018 from Cape Canaveral, Florida, to study the outer part of the sun's atmosphere, which causes the Solar wind, and the mission will last seven years.
