Interplanetary shock transmitted into the Earth's magnetosheath: Cluster and Double Star observations

Pallocchia, G.; Samsonov, A. A.; Cattaneo, M. B. Bavassano; Marcucci, M. F.; Rème, H.; Carr, C.; Cao, Jinbin

doi:10.5194/angeo-28-1141-2010

Cited by 34 publications

(35 citation statements)

References 31 publications

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“…The observed changes of parameters are determined mainly variations through the tangential or compound discontinuity. This numerical prediction is confirmed by recent observations [ Pallocchia et al ., ; Pallocchia , ].…”

Section: Discussionmentioning

confidence: 99%

“…A very similar discontinuity which moves earthward through the magnetosheath has been observed in Cluster data by Pallocchia et al . [] and Pallocchia [] and simulated using the local 3‐D magnetosheath model [ Pallocchia et al ., ]. According to the observations, this discontinuity propagates with the local flow velocity, similar to a tangential discontinuity.…”

Section: Secondary Waves and Discontinuities In Magnetosheathmentioning

confidence: 99%

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Large‐scale flow vortices following a magnetospheric sudden impulse

Samsonov

Sibeck

2013

JGR Space Physics

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[1] Global MHD simulations predict the generation of flow vortices on the magnetospheric flanks near the equatorial plane after the impact of solar wind dynamic pressure pulses on the magnetosphere. These vortices are associated with field-aligned currents, having similar senses to those responsible for the main impulse, i.e., the second impulse of the well-known sudden impulse variations at high geomagnetic latitudes. We investigate the evolution of the vortices and show that they result from the interaction of a fast MHD wave and the inner (near-Earth) boundary of numerical models. Near the inner boundary, the Ampere force decelerates plasma flow resulting in two closely related phenomena: the generation of flow vortices and the launch of a reflected fast wave moving sunward. The vortices propagate antisunward and split into several parts during several minutes. The reflected wave interacts with the magnetopause and bow shock and changes its velocity. The interaction between the reflected wave and bow shock results in two new discontinuities moving earthward through the magnetosheath. The first is either a very weak fast rarefaction wave or a weak fast shock, and the second is either a tangential discontinuity or a compound discontinuity with a decrease of the density and magnetic field and an increase of the temperature. We speculate that the inner boundary in simulations may correspond to either the plasmasphere or ionosphere.

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Section: Discussionmentioning

confidence: 99%

Section: Secondary Waves and Discontinuities In Magnetosheathmentioning

confidence: 99%

Large‐scale flow vortices following a magnetospheric sudden impulse

Samsonov

Sibeck

2013

JGR Space Physics

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“…Previous work gives heliosheath speeds for these pressure pulses that range from a dramatic slowing at the termination shock (Zank & Muller 2003) to a small decrease in speed (Steinolfson & Gurnett 1995;Washimi et al 2012;Zank 2015). Studies of solar wind shocks hitting Earth's bow shock suggest that the propagation speed through Earth's magnetosheath is 0.7-1 times the upstream shock speed (Szabo et al 2003;Koval et al 2006;Pallocchia et al 2010). Based on Earth observations and heliosheath models, for a 400 km s −1 upstream speed the heliosheath shock speed is probably 280-400 km s −1 .…”

Section: V2 Mirs and V1 Observationsmentioning

confidence: 99%

Pressure Pulses at Voyager 2: Drivers of Interstellar Transients?

Richardson

Wang

Liu

et al. 2017

ApJ

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Voyager 1 (V1) crossed the heliopause into the local interstellar medium (LISM) in 2012. The LISM is a dynamic region periodically disturbed by solar transients with outward-propagating shocks, cosmic-ray intensity changes and anisotropies, and plasma wave oscillations. Voyager 2 (V2) trails V1 and thus may observe the solar transients that are later observed at V1. V2 crossed the termination shock in 2007 and is now in the heliosheath. Starting in 2012, when solar maximum conditions reached V2, five possible merged interaction regions (MIRs) have been observed by V2 in the heliosheath. The timing is consistent with these MIRs driving the transients observed by V1 in the LISM. The largest heliosheath MIR was observed by V2 in late 2015 and should reach V1 in 2018.

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“…Global MHD simulations showed ) that a moderately strong interplanetary fast shock, interacting with the Earth's magnetosphere, will be reflected from the ionosphere. The passage of the inbound transmitted shock causes the bow shock and the magnetopause to move inward, while the passage of the sunward-propagating reflected shock causes the boundaries to move out, as confirmed by Pallocchia et al (2010) based on observations aboard Double Star TC1 and Cluster 3. Safrankova et al (2007) suggested that the combination of the inward and outward motions of the bow shock, caused by the transition of an interplanetary shock, results in an indentation of the bow shock surface which flows along the bow shock together with the interplanetary shock.…”

Section: Discussionmentioning

confidence: 65%

Multispacecraft observations of the terrestrial bow shock and magnetopause during extreme solar wind disturbances

et al. 2012

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Abstract. Three events are discussed from the declining phase of the last solar cycle when the magnetopause and/or the bow shock were observed unusually close to the Earth due to major interplanetary disturbances. The observed extreme locations of the discontinuities are compared with the predictions of three magnetopause and four bow shock models which describe them in considerably different ways using statistical methods based on observations. A new 2-D magnetopause model is introduced (based on Verigin et al., 2009) which takes into account the pressure of the compressed magnetosheath field raised by the interplanetary magnetic field (IMF) component transverse to the solar wind flow. The observed magnetopause crossings could be predicted with a reasonable accuracy (0.1-0.2 R E ) by one of the presented models at least. For geosynchronous magnetopause crossings observed by the GOES satellites, (1) the new model provided the best predictions when the IMF was extremely large having a large negative B z component, and (2)

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Interplanetary shock transmitted into the Earth's magnetosheath: Cluster and Double Star observations

Cited by 34 publications

References 31 publications

Large‐scale flow vortices following a magnetospheric sudden impulse

Large‐scale flow vortices following a magnetospheric sudden impulse

Pressure Pulses at Voyager 2: Drivers of Interstellar Transients?

Multispacecraft observations of the terrestrial bow shock and magnetopause during extreme solar wind disturbances

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