MultispacecraftMeasurementsof theEvolvingGeometryof theSolarAlfvénS...

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Multispacecraft Measurements of the Evolving Geometry of the Solar Alfvén Surface
over Half a Solar Cycle
Samuel T. Badman...

For these reasons, crossing this boundary was a key design
driver for the trajectory of Parker Solar Probe (Parker;
N. J. ...

initially fit by J.-B. Dakeyo et al. (2022) and the forcing
function in Y. J. Rivera et al. (2024), we size the force func...

within equally spaced 1 R⊙ bins. Next, to account for the
varying dwell time spent by the spacecraft at different
heliocen...

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2021b, 2023; S. T. Badman et al. 2023), which produce
systematic underestimates.
4. Results
Next, we present the inferred ...

number of CMEs per month reported in the Solar and
Heliospheric Observatory (SOHO) Large Angle and Spectro-
metric Coronag...

lower limit of these ranges is very close to the 11–16 R⊙ range
determined by A. J. Finley (2025). The average inferred by...

a mapping of a single point measurement of solar wind speed
and Alfvén speed to an estimate of the 3D location of the
Alfv...

Beyond just a rise from solar minimum to a peak at solar
maximum, the median height shows evidence of a dip in height
from...

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overwhelmingly likely to continue to probe well below the
Alfvén surface even as solar activity declines into the next
sol...

Laboratory is currently funded by UKSA/STFC grants
UKRI919 and UKRI1204. Solar Orbiter magnetometer opera-
tions are funde...

Before diving into the details, it is worth briefly justifying our
choice of 15 minute intervals. Our goal in this work is...

filtering and SPC operational distances again mean that this
measurement is largely powered by SPAN-i during perihelia,
by...

can be further simplified to yield
T T g T T
T gi T T
T T i T T
,
,
,
xx
xz
zz
2
2
( )
( )
( )
= +
=
= +
which are separab...

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additional constraint developed earlier in Equation (A.2) can
be used to assess this.
Second, the mathematical solutions i...

are set to those reported by J.-B. Dakeyo et al. (2022), while
the coronal temperature, Te, is set to 1 MK, in line with
S...

Herbst, K., Scherer, K., Ferreira, S. E. S., et al. 2020, ApJL, 897, L27
Hollweg, J. V. 1978, SoPh, 56, 305
Horbury, T. S....

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