Banking service chronicle published this article page no 1 achievements in 2019 parker discovered that magnetic zig-zag structures in the solar wind called switchbacks are plentiful close to the sun. but how and where they form remained a mystery. halving the distance to the sun since then psp has now passed close enough to identify one place where they originate the solar surface. in april 2021 the psp crossed the outer edge of the corona termed the alfvén critical boundary a point that marks the end of solar atmosphere and beginning of the solar wind. it should eventually get to within 7 million km (4 million miles) of the photosphere in 2025 Banking service chronicle magazine subscription.
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