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FIELDS is in a special place on the
spacecraft that electronics package is

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inside the spacecraft where most of the
electronics are but all of our sensors

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are mounted on the outside of the
spacecraft we have three sensors that

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measure magnetic fields that are mounted
on a boom behind the spacecraft in the

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shadow and shield and then we have five
sensors that measure a plasma voltage

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these are electric field sensors they
extend into full sunlight and they get

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very hot
two of the key measurements to

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understanding coronal heating are the
measurement of the magnetic field and

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the electric field and together they
give us what's called the pointing flux

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which is the energy flux of the or the
corona and to make those measurements we

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have to actually go into that plasma and
put sensors in the plasma to measure

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magnetic fields and electric fields
directly and that's what that's what

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fuels will do solar wind is the escaping
atmosphere of the Sun that's the

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escaping corona of the Sun the corona is
heated in a way that we don't understand

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yet presumably involving magnetic fields
by energy that's like comes from below

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and the photosphere and it's heated to
such a high temperature that it can

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escape the gravitational potential of
the Sun and become an escaping wind a

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stellar wind the solar wind well the
design of the fields instrument is a new

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thing for solar wind physics it kind of
combines two previous styles of

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experimentation there are two ways to
measure electric fields in space one is

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using a technique that's called a double
problem then there's another technique

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which is measuring plasma waves or radio
waves and fields for the first time

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brings these two techniques together I
think the very first data that we get

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will be revolutionary at first blush
it'll just be a bunch of numbers as a

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function of time but the team the
science team will take those numbers and

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make and make visualizations in the form
of spectrograms

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and eventually those those data will be
related to models and so we'll be able

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to compare directly 3d visual models of
the coronal magnetic field these

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measurements have never been made in the
environment close to the Sun we've made

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measurements similar to this in the
Earth's magnetosphere iris ionosphere

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but putting a package like this into
into the solar corona it's just never

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been done
the closest anyone's ever been to the

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Sun
based on what we've seen so far from

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spacecraft not quite as close it's going
to be striking and I think revolutionary