Wednesday, April 21, 2021
Home Lead Story 'Dent' in Earth's Magnetic Field Continues to Expand, Weaken in Intensity

‘Dent’ in Earth’s Magnetic Field Continues to Expand, Weaken in Intensity

Currently, the dent has not created any visible impacts on daily life on Earth

A dent in Earth’s magnetic field over South America and the southern Atlantic Ocean is expanding westward and continuing to weaken in intensity, according to recent observations by NASA scientists.

Currently, the dent has not created any visible impacts on daily life on Earth, but it could pose risk to satellites and spacecraft that pass through it, the US space agency said.

Earth’s magnetic field acts like a protective shield around the planet, repelling and trapping charged particles from the Sun.

Follow NewsGram on LinkedIn to know what’s happening around the world.

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.

'Dent' in Earth's magnetic field slowly expanding: Scientists
South Atlantic Anomaly’s valley, or region of minimum field strength, has split into two lobes, creating additional challenges for satellite missions. Pinterest

Particle radiation in this region can knock out onboard computers and interfere with the data collection of satellites that pass through it.

Recent data shows the South Atlantic Anomaly’s valley, or region of minimum field strength, has split into two lobes, creating additional challenges for satellite missions.

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 anomaly is slowly but steadily drifting in a northwesterly direction.

“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 Space Flight Center in Greenbelt, Maryland.

“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 South Atlantic Anomaly, which emphasised the need for continuing monitoring in the region.

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.

The International Space Station, which is in low-Earth orbit, also passes through the South Atlantic Anomaly.

It is well protected, and astronauts are safe from harm while inside, NASA said.

'Dent' in Earth's magnetic field slowly expanding: Scientists
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. Pinterest

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.

Also Read: Here’s How Lamborghini Remains Unaffected During Pandemic

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.”

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 is happening to Earth’s magnetic fields, deep inside the globe. (IANS)

STAY CONNECTED

19,507FansLike
362FollowersFollow
1,773FollowersFollow

Most Popular

Covid-19: How Does The Gut Respond To Immunity?

Our guts may not provide long-lasting systemic immunity from Covid-19, which is where immune cells circulate through the body to provide protection to other...

3 Online Master’s Degrees Will Be Offered By JGU And Coursera

O.P. Jindal Global University (JGU) has partnered with Coursera to launch three online masters' degree programs on the learning portal, the varsity said on...

Home Decor Ideas To Revamp Your Space

A new season -- whether summer or winter -- always brings new vibes, new colors, and gives you an opportunity to redo your home...

Discovery: DNA Based Vaccine To Provide Protection Against Current And Future Covid19 Strains

US researchers have developed a novel, low-cost DNA-based vaccine that may not only provide protection against existing variants of coronavirus but also against its...

Machine Learning Program To Identify Covid19 Related Conspiracy Theories

A team of researchers has identified that a new Machine Learning (ML) program accurately identifies Covid-19-related conspiracy theories on social media and models how...

The Night Witches: All-Female Bomber Regiment

By- Khushi Bisht 'The Night Witches' were the all-female pilots of the 588th Night Bomber Regiment of Russia. Joseph Stalin ordered the deployment of three...

The Safest Place In The World To Live In

BY- JAYA CHOUDHARY Living in the modern world is the safest time to be alive in the history of humanity. We can live a better,...

5 Types Of Automated Greeting Cards That Are Good For Business

By Sana Faisal A successful company has happy customers and happy employees. One way to achieve both is by celebrating birthdays, acknowledging special occasions, and...

Recent Comments