Temporal measurements of the interstellar helium focusing cone by the Magnetospheric Multiscale Mission(MMS)

2020 ◽  
Author(s):  
Roman Gomez ◽  
Stephen Fuselier ◽  
James Burch ◽  
Joey Mukherjee ◽  
Carrie Gonzalez ◽  
...  
Keyword(s):  
Radiation Environment ◽  
Neutral Density ◽  
The Sun ◽  
Plasma Composition ◽  
Local Interstellar Medium ◽  
Pickup Ions ◽  
Neutral Particles ◽  
Hot Plasma ◽  
Magnetospheric Multiscale ◽  
Magnetospheric Multiscale Mission

<p>The Sun and its associated heliosphere travels through the local interstellar medium (LISM) at 26 km/s.  This results in a flow of neutral particles constantly entering the heliosphere at the same velocity.  Neutral atoms with trajectories close to the Sun, which survive its ionizing radiation environment, become gravitationally attracted to it resulting in a focusing cone, a region of enhanced neutral density, downwind of the Sun.  The increased neutral density in these regions leads to a higher density of pickup ions created by charge-exchange of the neutrals.  In near-Earth orbit, the Magnetospheric Multiscale spacecraft (4 in all) have orbital apogees on the dayside during Earth’s annual encounter with the helium focusing cone (from mid-November to mid-December).  Since launching in March of 2015, regular acquisitions with the Hot Plasma Composition Analyzers (HPCAs) have been conducted, with acquisitions from 2017 through 2019 occurring with a 29 RE apogee, ensuring long intervals in the pristine Solar Wind.   We provide measurements of the focusing cone during the declining phase of the previous solar cycle. These measurements are used to investigate the effect of solar radiation on the focusing cone.</p>

The Extra‐Magnetospheric Ion Environment as Observed by the Magnetospheric Multiscale Mission Hot Plasma Composition Analyzer (MMS‐HPCA)

2019 ◽  
Vol 124 (3) ◽  
pp. 1509-1524 ◽  
Author(s):  
R. G. Gomez ◽  
S. A. Fuselier ◽  
J. Mukherjee ◽  
C. A. Gonzalez ◽  
J. L. Burch ◽  
...  
Keyword(s):  
Plasma Composition ◽  
Hot Plasma ◽  
Magnetospheric Multiscale ◽  
Composition Analyzer ◽  
Magnetospheric Multiscale Mission

Hot Plasma Composition Analyzer for the Magnetospheric Multiscale Mission

2016 ◽  
pp. 405-468
Author(s):  
D. T. Young ◽  
J. L. Burch ◽  
R. G. Gomez ◽  
A. De Los Santos ◽  
G. P. Miller ◽  
...  
Keyword(s):  
Plasma Composition ◽  
Hot Plasma ◽  
Magnetospheric Multiscale ◽  
Composition Analyzer ◽  
Magnetospheric Multiscale Mission

Hot Plasma Composition Analyzer for the Magnetospheric Multiscale Mission

2014 ◽  
Vol 199 (1-4) ◽  
pp. 407-470 ◽  
Author(s):  
D. T. Young ◽  
J. L. Burch ◽  
R. G. Gomez ◽  
A. De Los Santos ◽  
G. P. Miller ◽  
...  
Keyword(s):  
Plasma Composition ◽  
Hot Plasma ◽  
Magnetospheric Multiscale ◽  
Composition Analyzer ◽  
Magnetospheric Multiscale Mission

scholarly journals Determination of interstellar pickup ion distributions in the solar wind with SOHO and Cluster

1996 ◽  
Vol 14 (5) ◽  
pp. 492-496 ◽  
Author(s):  
E. Möbius ◽  
D. Rucinski ◽  
P. A. Isenberg ◽  
M. A. Lee
Keyword(s):  
Interstellar Medium ◽  
Interplanetary Medium ◽  
Direct Detection ◽  
Neutral Density ◽  
Local Interstellar Medium ◽  
Pickup Ions ◽  
Ion Distributions ◽  
Wide Range ◽  
Ionization Rates

Abstract. Over the last 10 years, the experimental basis for the study of the local interstellar medium has been substantially enhanced by the direct detection of interstellar pickup ions and of interstellar neutral helium within the heliosphere. Pickup ions can be studied for a wide range of interstellar species. However, currently the accuracy of the method to determine the parameters of the interstellar medium, namely neutral density, temperature and relative velocity, is hampered by two problems: (1) In most cases the crucial ionization rates are not available from simultaneous measurements and (2) the transport of the pickup ions in the interplanetary medium substantially modifies the measured spatial distribution of the ions. In this study we will discuss how the enhanced capabilities of the instrumentation on SOHO and Cluster in combination with ongoing efforts to model the pickup ion distributions will lead to a significant improvement over the coming years.

Direct measurements of cold and hot plasma composition and EMIC waves in the outer magnetosphere: Implications for inner magnetosphere wave-particle interactions

2021 ◽  
Author(s):  
Justin Lee ◽  
Drew Turner ◽  
Sarah Vines ◽  
Robert Allen ◽  
Sergio Toledo-Redondo
Keyword(s):  
Unstable Wave ◽  
Linear Wave ◽  
Plasma Composition ◽  
Inner Magnetosphere ◽  
Hot Plasma ◽  
Emic Wave ◽  
Direct Measurements ◽  
Wave Numbers ◽  
Emic Waves

<p>Although thorough characterization of magnetospheric ion composition is rare for EMIC wave studies, convective processes that occur more frequently in Earth’s outer magnetosphere have allowed the Magnetospheric Multiscale (MMS) satellites to make direct measurements of the cold and hot plasma composition during EMIC wave activity. We will present an observation and linear wave modeling case study conducted on EMIC waves observed during a perturbed activity period in the outer dusk-side magnetosphere. During the two intervals investigated for the case study, the MMS satellites made direct measurements of cold plasmaspheric plasma in addition to multiple hot ion components at the same time as EMIC wave emissions were observed. Applying the in-situ plasma composition data to wave modeling, we find that wave growth rate is impacted by the complex interactions between the cold as well as the hot ion components and ambient plasma conditions. In addition, we observe that linear wave properties (unstable wave numbers and band structure) can significantly evolve with changes in cold and hot ion composition. Although the modeling showed the presence of dense cold ions can broaden the range of unstable wave numbers, consistent with previous work, the hot heavy ions that were more abundant nearer storm main phase could limit the growth of EMIC waves to smaller wave numbers. In the inner magnetosphere, where higher cold ion density is expected, the ring current heavy ions could also be more intense near storm-time, possibly resulting in conditions that limit the interactions of EMIC waves with trapped radiation belt electrons to multi-MeV energies. Additional investigation when direct measurements of cold and hot plasma composition are available could improve understanding of EMIC waves and their interactions with trapped energetic particles in the inner magnetosphere.</p>

Magnetospheric Multiscale Mission

2005 ◽  
pp. 179-195 ◽  
Author(s):  
A. Surjalal Sharma ◽  
Steven A. Curtis
Keyword(s):  
Magnetospheric Multiscale ◽  
Magnetospheric Multiscale Mission

scholarly journals The geometric factor of electrostatic plasma analyzers: A case study from the Fast Plasma Investigation for the Magnetospheric Multiscale mission

2012 ◽  
Vol 83 (3) ◽  
pp. 033303 ◽  
Author(s):  
Glyn A. Collinson ◽  
John C. Dorelli ◽  
Levon A. Avanov ◽  
Gethyn R. Lewis ◽  
Thomas E. Moore ◽  
...  
Keyword(s):  
Geometric Factor ◽  
Magnetospheric Multiscale ◽  
Magnetospheric Multiscale Mission ◽  
Plasma Investigation

New Insights into the Nature of Turbulence in the Earth's Magnetosheath Using Magnetospheric MultiScale Mission Data

2018 ◽  
Vol 859 (2) ◽  
pp. 127 ◽  
Author(s):  
H. Breuillard ◽  
L. Matteini ◽  
M. R. Argall ◽  
F. Sahraoui ◽  
M. Andriopoulou ◽  
...  
Keyword(s):  
Magnetospheric Multiscale ◽  
Magnetospheric Multiscale Mission
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