Parker Solar Probe Survives 6.1 Million-Km Sun Pass at 692,000 Km/H

1 articles · Updated · spacedaily.com · Jul 27

NASA said Parker Solar Probe survived its 24 December 2024 closest approach, passing about 6.1 million km above the Sun’s photosphere before later sending a beacon.
At that distance, sunlight is roughly 500 times stronger than at Earth, but the main thermal threat is concentrated solar radiation rather than the corona’s million-degree plasma, which is too sparse to transfer heat efficiently.
An 11.5-centimetre carbon-foam heat shield—97% empty space—reflects and slows heat, keeping much of the spacecraft near 29C while its front face can withstand about 1,377C.
Seven Sun sensors and autonomous guidance keep the craft precisely inside the shield’s shadow, while retractable solar panels use a pressurised 3.7-litre water-cooling loop and exposed instruments rely on refractory metals and sapphire.
That design lets Parker sample the corona and young solar wind before they evolve on the way to Earth, improving understanding of space weather that can disrupt grids, satellites and communications.