Magnetics Business & Technology - May/June 2020 - 46

VISIONS

Magnetic Field at Martian Surface Ten Times Stronger than Expected

New data obtained from the magnetic sensor aboard NASA's
InSight spacecraft is offering an unprecedented close-up of
magnetic fields on Mars.
In a study published in the February edition of Nature Geoscience, scientists reveal that the magnetic field at the InSight
landing site is ten times stronger than anticipated, and fluctuates over time-scales of seconds to days.

underground.
"We think it's coming from much older rocks that are buried
anywhere from a couple hundred feet to ten kilometers below
ground," said Johnson. "We wouldn't have been able to deduce
this without the magnetic data and the geology and seismic
information InSight has provided."

"One of the big unknowns from previous satellite missions was
what the magnetization looked like over small areas," said
lead author Catherine Johnson, a professor at the University of
British Columbia and senior scientist at the Planetary Science
Institute. "By placing the first magnetic sensor at the surface,
we have gained valuable new clues about the interior structure
and upper atmosphere of Mars that will help us understand
how it - and other planets like it - formed."

Zooming in on magnetic fields

Before the InSight mission, the best estimates of Martian
magnetic fields came from satellites orbiting high above the
planet and were averaged over large distances of more than
150 kilometers.
"The ground-level data give us a much more sensitive picture
of magnetization over smaller areas, and where it's coming
from," said Johnson. "In addition to showing that the magnetic
field at the landing site was ten times stronger than the satellites anticipated, the data implied it was coming from nearby
sources."
Scientists have known that Mars had an ancient global magnetic field billions of years ago that magnetized rocks on the
planet, before mysteriously switching off. Because most rocks
at the surface are too young to have been magnetized by this
ancient field, the team thinks it must be coming from deeper

46

Magnetics Business & Technology * May/June 2020

In this artist's concept of NASA's InSight lander on Mars, layers of
the planet's subsurface can be seen below and dust devils can be
seen in the background. IPGP/Nicolas Sarter

Continued on page 45...

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Magnetics Business & Technology - May/June 2020

Table of Contents for the Digital Edition of Magnetics Business & Technology - May/June 2020

Magnetics Business & Technology - May/June 2020
Contents
Editor’s Choice/ Features
Magnetics Technology Flying High, Hot & Cold in Solar Orbiter Mission to the Sun
Carpenter Technology Moves Forward in Soft Magnetics and Additive Manufacturing, Exclusive Interview with CEO Tony Thene
Technique Uses Magnets and Light to Control, Reconfigure Soft Robots
Research & Development
Product News
Industry News
Annual Industry Resource Guide
Events Calendar/ Advertising Index
Magnetic Field at Martian Surface Ten Times Stronger than Expected
Visions
Magnetics Business & Technology - May/June 2020 - Magnetics Business & Technology - May/June 2020
Magnetics Business & Technology - May/June 2020 - Cover2
Magnetics Business & Technology - May/June 2020 - Contents
Magnetics Business & Technology - May/June 2020 - Editor’s Choice/ Features
Magnetics Business & Technology - May/June 2020 - 5
Magnetics Business & Technology - May/June 2020 - Magnetics Technology Flying High, Hot & Cold in Solar Orbiter Mission to the Sun
Magnetics Business & Technology - May/June 2020 - 7
Magnetics Business & Technology - May/June 2020 - 8
Magnetics Business & Technology - May/June 2020 - 9
Magnetics Business & Technology - May/June 2020 - Carpenter Technology Moves Forward in Soft Magnetics and Additive Manufacturing, Exclusive Interview with CEO Tony Thene
Magnetics Business & Technology - May/June 2020 - 11
Magnetics Business & Technology - May/June 2020 - 12
Magnetics Business & Technology - May/June 2020 - 13
Magnetics Business & Technology - May/June 2020 - 14
Magnetics Business & Technology - May/June 2020 - 15
Magnetics Business & Technology - May/June 2020 - 16
Magnetics Business & Technology - May/June 2020 - 17
Magnetics Business & Technology - May/June 2020 - Research & Development
Magnetics Business & Technology - May/June 2020 - 19
Magnetics Business & Technology - May/June 2020 - 20
Magnetics Business & Technology - May/June 2020 - 21
Magnetics Business & Technology - May/June 2020 - 22
Magnetics Business & Technology - May/June 2020 - 23
Magnetics Business & Technology - May/June 2020 - Product News
Magnetics Business & Technology - May/June 2020 - 25
Magnetics Business & Technology - May/June 2020 - 26
Magnetics Business & Technology - May/June 2020 - 27
Magnetics Business & Technology - May/June 2020 - Industry News
Magnetics Business & Technology - May/June 2020 - 29
Magnetics Business & Technology - May/June 2020 - 30
Magnetics Business & Technology - May/June 2020 - 31
Magnetics Business & Technology - May/June 2020 - 32
Magnetics Business & Technology - May/June 2020 - 33
Magnetics Business & Technology - May/June 2020 - Annual Industry Resource Guide
Magnetics Business & Technology - May/June 2020 - 35
Magnetics Business & Technology - May/June 2020 - 36
Magnetics Business & Technology - May/June 2020 - 37
Magnetics Business & Technology - May/June 2020 - 38
Magnetics Business & Technology - May/June 2020 - 39
Magnetics Business & Technology - May/June 2020 - 40
Magnetics Business & Technology - May/June 2020 - 41
Magnetics Business & Technology - May/June 2020 - 42
Magnetics Business & Technology - May/June 2020 - 43
Magnetics Business & Technology - May/June 2020 - Events Calendar/ Advertising Index
Magnetics Business & Technology - May/June 2020 - 45
Magnetics Business & Technology - May/June 2020 - Visions
Magnetics Business & Technology - May/June 2020 - Cover3
Magnetics Business & Technology - May/June 2020 - Cover4
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