Electrostatic Waves Observed At and Near the Solar Wind Termination Shock By Voyager 2

Gurnett, D. A.; Kurth, W. S.; Burlaga, L. F.; Acuña, M. H.; Ness, N. F.; Richardson, J. D.; Omidi, N.; Li, Gang; Hu, Qiang; Verkhoglyadova, Olga; Zank, G. P.; Lin, R. P.; Luhmann, J. R.

doi:10.1063/1.2982468

Cited by 3 publications

(9 citation statements)

References 4 publications

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“…We suggest that alternatively the enhanced waves seen in the PWS data in event A may be due to a two‐stream ion instability caused by the interaction between the convective bulk heliosheath (HS) plasma ions and a population of high‐energy ions (HEIs). This interpretation is consistent with the simulation of Gurnett et al [2008] suggesting the enhanced PWS signals near TS‐3 (event B) in Figure 1 were due to two interacting ion beams.…”

Section: Motivationsupporting

confidence: 90%

Higher‐energy plasma ions found near the termination shock: Analyses of Voyager 2 data in the heliosheath and in the outer heliosphere

Intriligator

Miller

et al. 2010

J. Geophys. Res.

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[1] We have found in the Voyager 2 (V2) plasma science data in the heliosheath (HS) near the termination shock (TS) high-energy ions (HEIs) in addition to the bulk plasma convective flow ions. The HEI detections temporally coincide with increased V2 plasma wave subsystem (PWS) activity in "event A" of . Maxwellian fits to HEI detections indicate the HEIs are moving radially anti-Sunward with a proton speed of 600 km/s, a density of 10 −4 cm −3 , and a thermal speed of 10 km/s. The heliosheath bulk convective protons have a speed of 204 km/s, a density of 0.0029 cm, and a thermal speed of 26.7 km/s. The HEI flux and ram pressure are approximately 10% and 30% of those of the bulk HS flow. Since the HEI speed is both close to twice the solar wind speed and independent of the heliosheath bulk plasma speed, the HEIs may be detections of pickup protons formed in the solar wind and convected through the TS. The HEIs also are reminiscent of the pickup protons upstream of the Mars bow shock where their energy also was independent of the bulk plasma speed and attributed to multiple reflections off the Mars bow shock. event A enhanced PWS activity may be generated by a two-stream instability from the interaction of these HEIs with the heliosheath bulk plasma ions. We present our findings, discuss their implications, and also present alternative interpretations.

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Section: Motivationsupporting

confidence: 90%

Higher‐energy plasma ions found near the termination shock: Analyses of Voyager 2 data in the heliosheath and in the outer heliosphere

Intriligator

Miller

et al. 2010

J. Geophys. Res.

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“…2 shows the modeled and measured solar wind proton density. The interaction of the EEls with the bulk convective plasma could give rise to a two stream plasma instabilityconsistent with that modeled in Gumett et al [12] associated with the ramp of the third V2 TS crossing -producing the enhanced PWS signals observed in Event A in Fig. While this value is low, comparison between the simulation results and the data shows that generally the model captures the data trends: it simulates the big density increases ~ Day 298, after Day 300, ~ Day 305, -Day 309, after Day 310, ~ Day 315, at Day 319, and ~ Day 325.…”

Section: D Mhd Hhms-pi Resultssupporting

confidence: 72%

“…For the entire 50-day interval shown the re is 0.78. The enhanced PWS signals labeled "Event A" are intriquing since Gumett et al [12] suggested that they could be associated with a V2 TS crossing but the PLS [14] and magnetometer [15] data did not appear to support this association. Here again our further analyses of these differences between the simulation and the data may provide physical insights into the processes responsible for the observations -in this case the cooling of the solar wind.…”

Section: D Mhd Hhms-pi Resultsmentioning

confidence: 96%

“…The next day when V2 was in the heliosheath the PWS detected enhanced plasma wave activity in the 31 and 56 kHz channels [12,13]. In August 2007 the TS crossed over V2 on Day 242 (August 30) during a data gap when the spacecraft was not being tracked.…”

Section: Introductionmentioning

confidence: 99%

“…Voyager 2 PWS data[12] of the enhanced plasma wave signals associated with Event A and the termination shock crossings in 2007.…”

mentioning

confidence: 99%

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Shock Waves in Space Environments

Intriligator¹,

Detman²,

Intriligator³

et al. 2009

AIP Conference Proceedings

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We present results on two topics: a) The three-dimensional (3D) Hybrid Heliospheric Modeling System with Pickup Ions (HHMS-PI) simulations of shock waves and initial comparisons with ACE and Ulysses data for the Halloween 2003 solar events, including the Ulysses SWICS pickup proton densities; and b) Our analyses of Voyager 2 (V2) data near the termination shock (TS). Previously, we used our timedependent 3D Hybrid Heliospheric Modeling System (HHMS) for magnetohydrodynamic (MHD)simulations of transient events originating on the Sun. We now have added the physics of "pickup" proton processes to these models. Interstellar neutral hydrogen flows into the hehosphere and becomes ionized by photoionization and by charge exchange with solar wind protons. These "pickup" protons cause a slowing and heating of the solar wind flow in the outer hehosphere. Both HHMS-PI and HHMS use continuous solar inputs to simulate processes that originate at the Sun. Our V2 analyses identified some elevated readings in the plasma subsystem (PLS) data. It is tempting to interpret these at face value as detections of high energy ions (HEIs) which may interact with the bulk convective plasma through a two stream instability giving rise to the observed enhanced signals in the plasma wave subsystem (PWS). Keywords: solar variability effects, solar wind plasma & fields, interplanetary magnetic fields, interplanetary propagation, hehosphere interstellar medium interaction, shocks, pickup ions PACS: 96.60.Q.-, 96.50sh, 96.50-e, 96.50.Bh, 96.50Xy,96.50Ya,96.60

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Electrostatic supersolitary waves: A challenging paradigm in nonlinear plasma science and beyond – State of the art and overview of recent results

Varghese,

Singh,

Kourakis

2024

Fundamental Plasma Physics

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Electrostatic Waves Observed At and Near the Solar Wind Termination Shock By Voyager 2

Cited by 3 publications

References 4 publications

Higher‐energy plasma ions found near the termination shock: Analyses of Voyager 2 data in the heliosheath and in the outer heliosphere

Higher‐energy plasma ions found near the termination shock: Analyses of Voyager 2 data in the heliosheath and in the outer heliosphere

Shock Waves in Space Environments

Electrostatic supersolitary waves: A challenging paradigm in nonlinear plasma science and beyond – State of the art and overview of recent results

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