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<blockquote style="position: relative; padding-left: 55px;"><section><a href="https://fosstodon.org/users/AkaSci/statuses/114206988343515849">AkaSci 🛰️ (akasci@fosstodon.org)'s status on Wednesday, 26-Mar-2025 07:25:31 JST</a><a href="https://fosstodon.org/@AkaSci" title="akasci@fosstodon.org"><img src="https://gnusocial.jp/avatar/20805-48-20221219024513.webp" width="48" height="48" alt="AkaSci 🛰️" style="position: absolute; left: 0; top: 0;">AkaSci 🛰️</a><div><a href="https://fosstodon.org/@AkaSci/114203755815357876" rel="in-reply-to">in reply to</a></div></section><article><p>The graphic below shows the size of the Sun, the distance between the Sun and the Parker Solar probe and the edge of the Corona, the Sun's "atmosphere." The edge is known as the Alfvén surface.</p><p>The Parker Solar Probe first penetrated the Sun's Corona during its 8th flyby on April 28, 2021, at 18.8 solar radii (13 million km) above the solar surface.</p><p>Today's encounter and the last one are at less than half that distance.</p><p>Let's hope it catches a solar flare or CME ☀️</p><p><a href="https://parkersolarprobe.jhuapl.edu/News-Center/Show-Article.php?articleID=173" rel="nofollow noreferrer">https://parkersolarprobe.jhuapl.edu/News-Center/Show-Article.php?articleID=173</a><br>3/n</p></article><footer><a rel="bookmark" href="https://gnusocial.jp/conversation/4792676#notice-9388303">In conversation</a><time datetime="2025-03-26T07:25:31+09:00" title="Wednesday, 26-Mar-2025 07:25:31 JST">about 22 days ago</time> <span>from <span><a href="https://fosstodon.org/@AkaSci/114206988343515849" rel="external" title="Sent from fosstodon.org via ActivityPub">fosstodon.org</a></span></span><a href="https://fosstodon.org/@AkaSci/114206988343515849">permalink</a><h4>Attachments</h4><ol><li><label><a rel="external" href="https://gnusocial.jp/attachment/4361315">1. Diagram illustrating the size of the Sun, the distance between the Sun and the Parker Solar probe and the edge of the Corona (aka the Alfvén surface).
Approximately to scale.2. Artist’s impression of Parker Solar Probe approaching the Alfvén critical surface, which marks the end of the solar atmosphere and the beginning of the solar wind. Parker Solar Probe crossed into this zone in April 2021.
Credit: NASA/Johns Hopkins APL/Ben Smith</a></label><br><a href="https://cdn.fosstodon.org/media_attachments/files/114/206/980/418/169/255/original/179fa6bb5d71b3ba.png" rel="external">https://cdn.fosstodon.org/media_attachments/files/114/206/980/418/169/255/original/179fa6bb5d71b3ba.png</a></li></ol></footer></blockquote>

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AkaSci 🛰️ (akasci@fosstodon.org)'s status on Wednesday, 26-Mar-2025 07:25:31 JST AkaSci 🛰️
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The graphic below shows the size of the Sun, the distance between the Sun and the Parker Solar probe and the edge of the Corona, the Sun's "atmosphere." The edge is known as the Alfvén surface.
The Parker Solar Probe first penetrated the Sun's Corona during its 8th flyby on April 28, 2021, at 18.8 solar radii (13 million km) above the solar surface.
Today's encounter and the last one are at less than half that distance.
Let's hope it catches a solar flare or CME ☀️
https://parkersolarprobe.jhuapl.edu/News-Center/Show-Article.php?articleID=173
3/n
In conversationabout 22 days ago from fosstodon.orgpermalink
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1. 1. Diagram illustrating the size of the Sun, the distance between the Sun and the Parker Solar probe and the edge of the Corona (aka the Alfvén surface). Approximately to scale. 2. Artist’s impression of Parker Solar Probe approaching the Alfvén critical surface, which marks the end of the solar atmosphere and the beginning of the solar wind. Parker Solar Probe crossed into this zone in April 2021. Credit: NASA/Johns Hopkins APL/Ben Smith
  https://cdn.fosstodon.org/media_attachments/files/114/206/980/418/169/255/original/179fa6bb5d71b3ba.png

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