To start off the summer, the U.S. Postal Service issued a set of stamps highlighting views of the Sun from NASA’s Solar Dynamics Observatory. Showcasing a range of solar activity seen by the spacecraft, the stamps celebrate a decade of Sun-watching for this workhorse mission. The Sun Science stamps were issued by the U.S. Postal Service during a ceremony at the Greenbelt Main Post Office in Maryland on June 18.
“It’s such a pleasure to see these gorgeous stamps,” said Dr. Nicky Fox, Division Director for NASA’s Heliophysics Division at NASA Headquarters in Washington, D.C. “I look at each of these pictures from the Solar Dynamics Observatory and am reminded of how they help us learn more about the Sun and the way its constantly changing atmosphere can affect Earth and the planets. I’m pleased that this imagery will be shared by the Postal Service with the whole country.”
The U.S. Postal Service issued a set of stamps highlighting views of the Sun from NASA’s Solar Dynamics Observatory on June 18, 2021. Credits: U.S. Postal Service
The Solar Dynamics Observatory, or SDO, spacecraft was launched on Feb. 11,
2010, and began collecting science data a few months later. With two imaging
instruments – the Atmospheric Imaging Assembly and the Helioseismic and
Magnetic Imager, which were designed in concert to provide complementary views
of the Sun – SDO sees the Sun in more than 10 distinct
wavelengths of light, showing solar material at
different temperatures. SDO also measures the Sun’s magnetic field and the
motion of solar material at its surface, and, using a technique called
helioseismology, allows scientists to probe deep into the Sun's interior, where
the Sun’s complex magnetic fields sprout from. And with more than a decade of observation under its belt,
SDO has provided scientists with hundreds of millions of images of our star.
“What SDO has done is given us the ecology of the Sun,” said Dr. Dean
Pesnell, SDO project scientist at NASA Goddard. “We see events big, we see
events small, and now we start to see how each size affects the others. It’s
giving us the big picture, one detail at a time.”
NASA's Solar Dynamics Observatory sees the Sun in more than 10 distinct wavelengths of light, showing solar material at different temperatures. Credits: NASA's Goddard Space Flight Center Download this video in HD formats.
SDO’s long data record is particularly useful for
studying the Sun’s regular activity cycles, which swing between high and low
activity approximately every 11 years. During high points in the cycle, solar
activity like solar flares and coronal mass ejections – which can impact
technology on Earth and in space – are more common. Though scientists’
understanding of this cycle has improved in
decades and centuries past, SDO’s data is helping uncover even more detail.
“If we want to understand what makes the Sun tick, we
need to have this long-term record,” said Dr. Mark Cheung, principal
investigator for SDO’s Atmospheric Imaging Assembly at the Lockheed Martin
Solar and Astrophysics Laboratory in Palo Alto, California. “We can track all
those magnetic fields and sunspots moving around, and how that feeds into the
next solar cycle – which is in its nascent phase now.”
The new set of stamps features 10 images from SDO. Explore the
story behind the stamps’ design from the U.S. Postal Service.
Read on for more about the science behind each stamp.
Coronal
Hole
The dark area capping the northern polar region of the
Sun is a coronal hole, a magnetically open area on the Sun from which
high-speed solar wind escapes into space. Such high-speed solar wind streams
can spark magnificent auroral displays on Earth when they collide with our
planet’s magnetic field. These images were captured May 17-19, 2016, and the
image on the stamp is from May 17. The images show the Sun in 211 Angstrom
light, a wavelength of extreme ultraviolet light. This type of light is
invisible to our eyes and is absorbed by Earth’s atmosphere, so it can only be
seen by instruments in space.
Coronal
Loops
Visible on the lower right of the Sun is a prominence,
with its bright arcs traced out by charged particles spiraling along the Sun’s
magnetic field lines. Coronal loops are often found over sunspots and active
regions, which are areas of intense and complex magnetic fields on the Sun.
These images were captured on June 18, 2015, in light at 304 Angstroms, an
extreme ultraviolet wavelength.
Solar Flare
Credits: NASA/SDO
The bright flash on the Sun’s upper right is a
powerful X-class solar flare. X-class flares are the most powerful type of
solar flare, and these bursts of light and energy can disturb the part of
Earth’s atmosphere where GPS and radio signals travel. These images were
captured on Aug. 9, 2011, in extreme ultraviolet wavelength 335 Angstroms.
Active Sun
This view highlights the many active regions dotting
the Sun’s surface. Active regions are areas of intense and complex magnetic
fields on the Sun – linked to sunspots – that are prone to erupting with solar
flares or explosions of material called coronal mass ejections. This image was
captured on Oct. 8, 2014, in extreme ultraviolet wavelength 171 Angstroms.
Plasma
Blast
These images show a burst of material from the Sun,
called a coronal mass ejection. These eruptions of magnetized solar material
can create space weather effects on Earth when they collide with our planet’s
magnetosphere, or magnetic environment – including aurora, satellite
disruptions, and, when extreme, even power outages. These images are a blend of
extreme ultraviolet wavelengths 171 and 304 Angstroms, captured on Aug. 31,
2012.
Coronal Loops
These images show evolving coronal loops across the limb and disk of the Sun. Just days after these images were taken, the Sun unleashed a powerful X-class solar flare. These images were captured in extreme ultraviolet wavelength 171 Angstroms from July 8-10, 2012, and the image on the stamp is from July 9.
Sunspots
This view in visible light – the type of light we can
see – shows a cluster of sunspots near the center of the Sun. Sunspots appear
dark because they are relatively cool compared to surrounding material, a
consequence of the way their extremely dense magnetic field prevents heated
material from rising to the solar surface. These images were captured Oct.
20-26, 2014, and the frame on the stamp is from Oct. 23.
Plasma
Blast
These images show a burst of plasma from the lower
right of the Sun, which happened in conjunction with a mid-level solar flare.
These images are a blend of extreme ultraviolet wavelengths 171 and 304
Angstroms from Oct. 2, 2014.
Solar Flare
These images show another view of the Aug. 9, 2011,
X-class solar flare featured in the blue-toned 335 Angstrom images. These
images were captured in light at 131 Angstroms, an extreme ultraviolet
wavelength.
Coronal
Hole
These images show a pair of coronal holes, one near
the Sun’s equator and one at the Sun’s South Pole. These images were captured
in extreme ultraviolet wavelength 193 Angstroms from Jan. 9-12, 2011, and the
frame on the stamp is from Jan. 10.
SDO’s Atmospheric Imaging Assembly, which provides
extreme ultraviolet views of the Sun, was designed and built by the Lockheed
Martin Solar and Astrophysics Laboratory. The Helioseismic and Magnetic Imager
was designed by Stanford University and built by the Lockheed Martin Solar and
Astrophysics Laboratory. SDO was built and is operated and managed by Goddard
for NASA’s Science Mission Directorate in Washington, D.C.
By Sarah Frazier
NASA's
Goddard Space Flight Center, Greenbelt, Md.
Source: Sun Science Stamps Highlight a
Decade of Sun-Watching from Space | NASA
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