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CODEX Coronagraph Heads to the ISS on Cargo Dragon

November 10, 2024
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CODEX Coronagraph Heads to the ISS on Cargo Dragon
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A brand new space-based telescope goals to handle a key photo voltaic thriller.

A brand new experiment will discover a area of the Solar that’s powerful to see from the floor of the Earth. The photo voltaic corona—the elusive, pearly white area of the photo voltaic environment seen briefly throughout a complete photo voltaic eclipse—is mostly swamped out by the dazzling Solar. Now, the Coronal Diagnostic Experiment (CODEX) will use a coronagraph to create an ‘synthetic eclipse’ in an effort to discover the poorly understood center corona area of the photo voltaic environment.

CODEX launched as a part of the cargo manifest on SpaceX’s Cargo Dragon this week, on mission CRS-31. CRS-31 arrived on the ISS and docked on the Concord ahead port of the station on November fifth.

CODEX is a partnership between NASA’s Goddard Spaceflight Heart, Italy’s Nationwide Institute for Astrophysics (INAE) and KASI (Korea Astronomy and House Science Institute). Technical experience for the venture was offered by the U.S. Naval Analysis Laboratory (NRL).

CODEX will probably be mounted on the EXPRESS (Expedite the Processing of Experiments to the House Station) Logistics Service Web site 3 (ELC-3) on the ISS.

CODEX
An animation of CODEX on the ISS. NASA

Why Use Coronagraphs

Coronagraphs work by blocking out the Solar with an occulting disk. The disk utilized in CODEX is about as huge as an orange. Although coronagraphs can work on Earth, putting them in area is a straightforward strategy to get rid of undesirable gentle attributable to atmospheric scattering.

Corona
The photo voltaic corona, as imaged by the Excessive Altitude Observatory’s coronagraph. UCAR/NCAR.

Concentrating on the center area of the corona is essential, because it’s considered the supply of the photo voltaic wind. However what heats this area to temperatures really hotter than the floor under? This rise is within the order of one million levels, versus 6000 levels Celsius for the photo voltaic photosphere. The identical unknown course of accelerates particles to large speeds of over one million kilometers an hour.

CODEX seeks to handle this dilemma, and can measure Doppler shifts in charged particles at 4 filtered wavelengths. The instrument might want to heart and monitor the Solar from its perch on the outside of the ISS. To this finish, this should happen whereas dashing across the Earth as soon as each 90 minutes. CODEX will be capable of see the Solar roughly half of the time, although seasons close to both solstice will enable for near-continuous views.

CODEX will work with NASA’s Parker Photo voltaic Probe and ESA’s Photo voltaic Orbiter (SolO) in finding out this coronal heating dilemma. As well as, it can additionally be part of the Photo voltaic Heliospheric (SOHO’s) LASCO C2 and C3 coronagraph in area. One other new coronagraph instrument in area is the Nationwide Oceanic Atmospheric Administration’s CCOR-1 (Compact Coronagraph) aboard the GOES-19 satellite tv for pc in geosynchronous orbit.

A Photo voltaic Wind Riddle

“CODEX measures the plasma’s temperature, velocity and density round the entire corona between 3 and 10 photo voltaic radii, and can measure how these parameters evolve in time, offering new constraints on all theories of coronal heating,” Niicholeen Viall (GFSC-Photo voltaic Physics Laboratory) advised Universe At the moment. “Parker Photo voltaic Probe measures these plasma parameters within the higher corona (getting as shut as 10 photo voltaic radii) in nice element, however it makes these measurements in situ (from one one location in area and time) and solely briefly that near the Solar.”

The CODEX group with the instrument, forward of launch. Credit score: CODEX/NASA.

The objective of CODEX is to supply a holistic view of photo voltaic wind exercise. “In distinction, CODEX supplies a worldwide view and context of those plasma parameters and their evolution,” says Viall. “Moreover, CODEX extends the measurements a lot nearer to the Solar than Parker Photo voltaic Probe (PSP), linking the detailed measurements made at PSP at 10 photo voltaic radii by the center corona, right down to ~3 photo voltaic radii, nearer to their supply. That is vital as a result of a lot of the coronal heating has already taken place by 10 photo voltaic radii, the place PSP measures.”

A Twin Thriller

Two theories vie to elucidate the solar heating mystery. A primary says that tangled magnetic fields are transformed into thermal energy. These are in flip fed into the corona as bursts of vitality. One other says that oscillations often known as Alfvén waves inject vitality in a type of suggestions loop within the decrease corona.

“Photo voltaic Orbiter has (an) EUV (Excessive ultraviolet) and white gentle imager that could possibly be used to attach the CODEX measurements to their sources on the Solar,” says Viall.

Understanding this area and the supply of the photo voltaic wind is essential to predicting area climate. That is particularly important when the Solar sends highly effective corona mass ejections our manner. Not solely can these spark low latitude aurorae, however these may also influence communications and pose a hazard to satellites and astronauts in area.

“CODEX is much like all coronagraphs, in that they block gentle out from the photosphere to see the a lot fainter corona.” Says Viall. CODEX’s area of view has overlap with, however is totally different than SOHO’s coronagraphs and CCOR. The most important distinction although, is that CODEX has particular filters that may present the temperature and velocity of the photo voltaic wind, along with the density measurements that white gentle coronagraphs at all times make.”

The Previous (and Future) of Coronagraphs in House

Moreover, there’s additionally a historical past of coronagraphs aboard area stations. This goes all the best way again to the white-light coronagraph aboard Skylab within the early Nineteen Seventies.

Seeking to the long run, extra coronagraphs are headed space-ward. ESA’s solar-observing Proba-3 launches on the finish of November. Proba-3 will function the primary free-flying occulting disk as a part of the mission. PUNCH (the Polarimeter to UNify the Corona and Heliosphere) will function 4 micro-sat orbiters. The mission will rideshare launch with NASA’s SPHEREx mission early subsequent 12 months.

“PUNCH is a white gentle coronagraph and set of heliospheric imagers that collectively picture from six photo voltaic radii out by the interior heliosphere.” Says Viall. PUNCH will be capable of watch the constructions that CODEX identifies as they as they evolve and are modulated father out within the heliosphere.”

Fianlly, astronomers may also use coronagraph-style devices to picture exoplanets instantly. The Nancy Grace Roman House telescope (set to launch in 2027) will function one such instrument.

It is going to be thrilling to see CODEX in motion, because it probes the mysteries of the photo voltaic wind.

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