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A new sunspot rises as Orion turns home

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15:28UTC

NOAA forecasters logged a fresh active region on the central solar disk overnight, the emerging space weather risk for the return leg.

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ScienceDeveloping

Key takeaway

Region 4412 is the new central-disk watch item as Orion begins its return leg.

NOAA SWPC's 0030 UTC discussion on 7 April identified a new active region, Region 4412, at N10W04 on the central solar disk with substantial flux emergence.¹ It is the first such central-disk region to emerge during the return phase. No news outlet has yet reported the handover.

Two days earlier Region 4409 had produced only minor flares at flyby , and it has now rotated to W43, declining as a return-leg threat. By splashdown it will sit near the western limb at approximately W82, geometrically unable to direct a significant event at Earth. NOAA SWPC still assigns Region 4409 a 40% M-class flare probability for the next forecast day (M-class is a medium-strength solar flare on NASA's A/B/C/M/X scale, where X is strongest).²

The handover matters because the broader G3 storm window has closed and the crew has now started its return. A central-disk flare from Region 4412 would couple directly to the unpublished cumulative dose story; a limb event from 4409 would not.

Deep Analysis

In plain English

The Sun constantly produces dark patches called sunspots, which are areas of intense magnetic activity. Some sunspots fire off bursts of radiation called solar flares. When a sunspot is facing Earth, its flares can reach a spacecraft in transit. Yesterday's risk came from a sunspot called Region 4409, which went quiet just in time. Today, forecasters identified a new sunspot, Region 4412, on the central part of the Sun facing Earth. It will be watched as Orion makes its return trip home over the next three days.

Deep Analysis

Escalation

Region 4412 presents a genuine but manageable escalation in space weather risk for the return leg. The key metric is central-disk rotational position at splashdown: if the region remains active and fires an M-class or higher event within 72 hours, the proton propagation timing relative to Orion's re-entry window (8:07 PM EDT, 10 April) will determine dose impact.

Current trajectory: Region 4409 declining to W82 by 10 April (geometrically benign). Region 4412 emerging at N10W04, rotating approximately 13 degrees westward per day, reaching roughly N10W35 by splashdown — still Earth-facing but moving away. Net assessment: moderate and declining risk. The unpublished cumulative dose baseline (ID:2066) means any additional exposure from Region 4412 cannot be placed in context publicly.

What could happen next?

Risk
An M-class or higher flare from Region 4412 in the next 72 hours would add measurable radiation dose to an already-unpublished cumulative exposure total, making independent post-mission dose assessment harder.
Opportunity
Orion's re-entry on 10 April coincides with Region 4412 rotating away from optimal Earth-facing position; if the region remains below X-class through 10 April, the return risk resolves cleanly.

Source Landscape

This story draws on neutral-leaning sources

Primary parallel: During Apollo 16 in April 1972, a solar proton event on 16 April erupted while the crew was on the lunar surface. Post-mission analysis by NASA and NCRP found that had the crew been in deep space rather than near the Moon at the time, doses would have exceeded career limits. The timing missed the crew by two days. Region monitoring was less precise in 1972; NOAA SWPC's modern 0030 UTC discussion cadence represents a substantial operational improvement.

Counter-parallel: Region 4409 was forecast at 40% M-class probability during the flyby and produced only minor flares (ID:2067). Forecast probabilities for individual regions do not translate directly to mission risk without the coupling calculation between flare timing, particle propagation, and spacecraft position.

Consensus view: NOAA SWPC's 0030 UTC 7 April discussion follows standard operational protocols; a new flux-emergent region at N10W04 in the central disk is a legitimate watch item for the next 72-96 hours. At current solar cycle position (Solar Cycle 25, approaching maximum), central-disk regions with substantial flux emergence carry a 30-50% probability of producing an M-class or higher event within 3 days, per SWPC statistical baselines.

Counter-view: ESA's Space Weather Service Network and the UK Met Office Space Weather Operations Centre both assess that a single day of flux emergence data is insufficient to classify Region 4412's peak flare probability. The region could develop or decay before it becomes Earth-facing; early identification is operationally prudent but should not be treated as a firm forecast.

Key tension: Whether Region 4412's central-disk position at splashdown (approximately N10W35 by 10 April) creates any meaningful additional dose risk if it fires an M-class event during re-entry — the period when Orion's crew has no shelter option available.

Sources:NOAA Space Weather Prediction Center·NOAA Space Weather Prediction Center

Mentions:Space Weather Prediction Center →Region 4409 →Orion →NOAA →Apollo 16 →NASA →Prima →European Space Agency →

First Reported In

Update #6 · Rest Day Between Records and Reckoning

NOAA Space Weather Prediction Center· 7 Apr 2026

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Causes and effects

This Event

A new sunspot rises as Orion turns home

An M-class flare during the return could add measurable dose to a mission whose cumulative crew exposure remains unpublished.

Led to

Primary Solar Threat Decays Before Re-entry

Region 4412 was identified as the primary return-leg threat (ID:2089); its decay by 9 April eliminated that threat and cleared the re-entry weather window.

Occurred 9 Apr 2026

Read story →

Different Perspectives

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NASA

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ESA

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NASA Office of Inspector General

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US: NASA, White House, Congress

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