After Days of Silence, NASA’s Parker Solar Probe Makes Contact.Science news.

 After Days of Silence, NASA’s Parker Solar Probe Makes Contact.

 The probe transmitted a signal to Earth, confirming it had successfully endured the closest approach to the Sun ever attempted by a spacecraft.

An artists’ impression of the Parker Solar Probe approaching the sun.Credit...APL/EPA, via Shutterstock

NASA’s Parker Solar Probe Phones Home After Record-Breaking Solar Approach

On December 24, NASA’s Parker Solar Probe made its closest approach yet to the sun, soaring just a few million miles above its scorching surface.

As the probe ventured into this unprecedented proximity, the mission team anxiously awaited confirmation of its survival. Just before midnight on Thursday, Parker finally made contact, sending not one but four signals to Earth, each confirming its health.

“It’s like the spacecraft wanted to reassure us,” said Nour Rawafi, an astrophysicist at Johns Hopkins Applied Physics Laboratory and the project scientist for the mission. The team was both thrilled and relieved by the update.

Since its 2018 launch, Parker has used Venus’s gravity to edge closer to the sun through a series of flybys. Initially, the team was apprehensive about how the probe would fare so near a star. However, after 21 successful orbits, their confidence in Parker’s resilience has grown.

NASA’s Parker Solar Probe Endures Record Heat and Speed in Latest Solar Flyby

Despite the spacecraft’s proven resilience, there was apprehension about whether the Parker Solar Probe would survive its latest encounter with the sun. The probe’s innovative heat shield is designed to withstand the searing temperatures of the sun’s outer atmosphere, which can reach millions of degrees. While the front of the spacecraft faces this blistering heat, the back—housing its sensitive instruments—remains at a comfortable 85 degrees Fahrenheit.

“Literally one side is at a temperature that is unfathomable,” said Joseph Westlake, NASA’s director of heliophysics. “And the back of it is a hot, sunny day.”

Adding to the challenge is the sun’s current peak activity, part of an 11-year cycle of solar flares and plasma expulsions.

On Christmas Eve at 6:53 a.m. Eastern time, Parker made its closest approach yet, skimming just 3.8 million miles above the solar surface at an extraordinary speed of 430,000 miles per hour. Despite this daring maneuver, confirmation of the spacecraft’s survival didn’t reach Earth until nearly three days later.

Mission specialists gathered in a Maryland control room on the night of December 26, anxiously awaiting the signal. To their relief, it arrived a few seconds early.

“I’m proud of what has been achieved,” said Dr. Nour Rawafi, the mission’s project scientist. “It’s really a historic milestone for space exploration.”

The solar data from this flyby is expected to reach Earth on New Year’s Day. Scientists hope it will shed light on the origins of the solar wind, a stream of charged particles that creates a protective bubble around the solar system, and on the puzzling temperature difference between the sun’s surface and its outer atmosphere, the corona.

“It’s like standing next to a bonfire, taking a few steps back, and suddenly feeling hotter,” Dr. Westlake explained. “It just doesn’t make any sense.”

The Parker Solar Probe has two more flybys at this altitude before its primary mission concludes in September. However, scientists are optimistic about extending the mission to align with the sun’s full activity cycle, which peaks now and is expected to quiet down in the 2030s.

Until then, researchers eagerly anticipate the insights that Parker’s latest data will reveal. “That’s what we’re waiting for—anything new that we haven’t seen before,” said Dr. Rawafi.

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