A small but
evolving dent in Earth’s magnetic field can cause big headaches for satellites.
Earth’s magnetic field acts like a protective shield
around the planet, repelling and trapping charged particles from the Sun. But
over South America and the southern Atlantic Ocean, an unusually weak spot in
the field — called the South Atlantic Anomaly, or SAA — allows these particles
to dip closer to the surface than normal. Particle radiation in this region can
knock out onboard computers and interfere with the data collection of
satellites that pass through it — a key reason why NASA scientists want to
track and study the anomaly.
The South Atlantic Anomaly is also of interest to
NASA’s Earth scientists who monitor the changes in magnetic field strength
there, both for how such changes affect Earth’s atmosphere and as an indicator
of what’s happening to Earth’s magnetic fields, deep inside the globe.
Currently, the SAA creates no visible impacts on daily
life on the surface. However, recent observations and forecasts show that the
region is expanding westward and continuing to weaken in intensity. It is also
splitting — recent data shows the anomaly’s valley, or region of minimum field
strength, has split into two lobes, creating additional challenges for
satellite missions.
A host of NASA scientists in geomagnetic, geophysics,
and heliophysics research groups observe and model the SAA, to monitor and
predict future changes — and help prepare for future challenges to satellites
and humans in space.
Earth’s magnetic field acts like a
protective shield around the planet, repelling and trapping charged particles
from the Sun. But over South America and the southern Atlantic Ocean, an
unusually weak spot in the field – called the South Atlantic Anomaly, or SAA –
allows these particles to dip closer to the surface than normal. Currently, the
SAA creates no visible impacts on daily life on the surface. However, recent
observations and forecasts show that the region is expanding westward and
continuing to weaken in intensity. The South Atlantic Anomaly is also of
interest to NASA’s Earth scientists who monitor the changes in magnetic
strength there, both for how such changes affect Earth’s atmosphere and as an
indicator of what’s happening to Earth’s magnetic fields, deep inside the
globe.
It’s what’s inside that counts
The South Atlantic Anomaly arises from two features of
Earth’s core: The tilt of its magnetic axis, and the flow of molten metals
within its outer core.
Earth is a bit like a bar magnet, with north and south
poles that represent opposing magnetic polarities and invisible magnetic field
lines encircling the planet between them. But unlike a bar magnet, the core
magnetic field is not perfectly aligned through the globe, nor is it perfectly
stable. That’s because the field originates from Earth’s outer core: molten,
iron-rich and in vigorous motion 1800 miles below the surface. These churning
metals act like a massive generator, called the geodynamo, creating electric
currents that produce the magnetic field.
As the core motion changes over time, due to complex
geodynamic conditions within the core and at the boundary with the solid mantle
up above, the magnetic field fluctuates in space and time too. These dynamical
processes in the core ripple outward to the magnetic field surrounding the
planet, generating the SAA and other features in the near-Earth environment —
including the tilt and drift of the magnetic poles, which are moving over time.
These evolutions in the field, which happen on a similar time scale to the
convection of metals in the outer core, provide scientists with new clues to
help them unravel the core dynamics that drive the geodynamo.
“The magnetic field is actually a superposition of
fields from many current sources,” said Terry Sabaka, a geophysicist at NASA’s
Goddard Space Flight Center in Greenbelt, Maryland. Regions outside of the solid
Earth also contribute to the observed magnetic field. However, he said, the
bulk of the field comes from the core.
The forces in the core and the tilt of the magnetic
axis together produce the anomaly, the area of weaker magnetism — allowing
charged particles trapped in Earth’s magnetic field to dip closer to the
surface.
The Sun expels a constant outflow of particles and
magnetic fields known as the solar wind and vast clouds of hot plasma and
radiation called coronal mass ejections. When this solar material streams
across space and strikes Earth’s magnetosphere, the space occupied by Earth’s
magnetic field, it can become trapped and held in two donut-shaped belts around
the planet called the Van Allen Belts. The belts restrain the particles to
travel along Earth’s magnetic field lines, continually bouncing back and forth
from pole to pole. The innermost belt begins about 400 miles from the surface
of Earth, which keeps its particle radiation a healthy distance from Earth and
its orbiting satellites.
However, when a particularly strong storm of particles
from the Sun reaches Earth, the Van Allen belts can become highly energized and
the magnetic field can be deformed, allowing the charged particles to penetrate
the atmosphere.
“The observed SAA can be also interpreted as a
consequence of weakening dominance of the dipole field in the region,” said
Weijia Kuang, a geophysicist and mathematician in Goddard’s Geodesy and
Geophysics Laboratory. “More specifically, a localized field with reversed
polarity grows strongly in the SAA region, thus making the field intensity very
weak, weaker than that of the surrounding regions.”
A pothole in space
Although the South Atlantic Anomaly arises from
processes inside Earth, it has effects that reach far beyond Earth’s surface.
The region can be hazardous for low-Earth orbit satellites that travel through
it. If a satellite is hit by a high-energy proton, it can short-circuit and
cause an event called single event upset or SEU. This can cause the satellite’s
function to glitch temporarily or can cause permanent damage if a key component
is hit. In order to avoid losing instruments or an entire satellite, operators
commonly shut down non-essential components as they pass through the SAA.
Indeed, NASA’s Ionospheric Connection Explorer regularly travels through the
region and so the mission keeps constant tabs on the SAA’s position.
The International Space Station, which is in low-Earth
orbit, also passes through the SAA. It is well protected, and astronauts are
safe from harm while inside. However, the ISS has other passengers affected by
the higher radiation levels: Instruments like the Global Ecosystem Dynamics
Investigation mission, or GEDI, collect data from various positions on the
outside of the ISS. The SAA causes “blips” on GEDI’s detectors and resets the
instrument’s power boards about once a month, said Bryan Blair, the mission’s
deputy principal investigator and instrument scientist, and a lidar instrument
scientist at Goddard.
“These events cause no harm to GEDI,” Blair said. “The
detector blips are rare compared to the number of laser shots — about one blip
in a million shots — and the reset line event causes a couple of hours of lost
data, but it only happens every month or so.”
In addition to measuring the SAA’s magnetic field
strength, NASA scientists have also studied the particle radiation in the
region with the Solar, Anomalous, and Magnetospheric Particle Explorer, or
SAMPEX — the first of NASA’s Small Explorer missions, launched in 1992 and
providing observations until 2012. One study, led by NASA heliophysicist Ashley
Greeley as part of her doctoral thesis, used two decades of data from SAMPEX to
show that the SAA is slowly but steadily drifting in a northwesterly direction.
The results helped confirm models created from geomagnetic measurements and
showed how the SAA’s location changes as the geomagnetic field evolves.
“These particles are intimately associated with the
magnetic field, which guides their motions,” said Shri Kanekal, a researcher in
the Heliospheric Physics Laboratory at NASA Goddard. “Therefore, any knowledge
of particles gives you information on the geomagnetic field as well.”
Greeley’s results, published in the journal Space
Weather, were also able to provide a clear picture of the type and amount of
particle radiation satellites receive when passing through the SAA, which
emphasized the need for continuing monitoring in the region.
The information Greeley and her collaborators garnered
from SAMPEX’s in-situ measurements has also been useful for satellite design.
Engineers for the Low-Earth Orbit, or LEO, satellite used the results to design
systems that would prevent a latch-up event from causing failure or loss of the
spacecraft.
Modeling a safer future for satellites
In order to understand how the SAA is changing and to
prepare for future threats to satellites and instruments, Sabaka, Kuang and
their colleagues use observations and physics to contribute to global models of
Earth’s magnetic field.
The team assesses the current state of the magnetic
field using data from the European Space Agency’s Swarm constellation, previous
missions from agencies around the world, and ground measurements. Sabaka’s team
teases apart the observational data to separate out its source before passing
it on to Kuang’s team. They combine the sorted data from Sabaka’s team with
their core dynamics model to forecast geomagnetic secular variation (rapid
changes in the magnetic field) into the future.
The geodynamo models are unique in their ability to
use core physics to create near-future forecasts, said Andrew Tangborn, a
mathematician in Goddard’s Planetary Geodynamics Laboratory.
“This is similar to how weather forecasts are
produced, but we are working with much longer time scales,” he said. “This is
the fundamental difference between what we do at Goddard and most other
research groups modeling changes in Earth’s magnetic field.”
One such application that Sabaka and Kuang have
contributed to is the International Geomagnetic Reference Field, or IGRF. Used
for a variety of research from the core to the boundaries of the atmosphere,
the IGRF is a collection of candidate models made by worldwide research teams
that describe Earth’s magnetic field and track how it changes in time.
“Even though the SAA is slow-moving, it is going
through some change in morphology, so it’s also important that we keep
observing it by having continued missions,” Sabaka said. “Because that’s what
helps us make models and predictions.”
The changing SAA provides researchers new
opportunities to understand Earth’s core, and how its dynamics influence other
aspects of the Earth system, said Kuang. By tracking this slowly evolving
“dent” in the magnetic field, researchers can better understand the way our
planet is changing and help prepare for a safer future for satellites.
Source: https://www.nasa.gov/feature/nasa-researchers-track-slowly-splitting-dent-in-earth-s-magnetic-field
Photo Credit: NASA’s
Goddard Space Flight Center
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