Positive and negative sudden impulses caused by fast forward and reverse interplanetary shocks

Andrioli, V. F.; Echer, E.; Savian, Jairo Francisco; Schuch, Nelson Jorge

doi:10.1590/s0102-261x2007000600021

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…It is interesting to point out that the magnetospheric response to a positive impulse is much stronger than that to a negative impulse (Figures 6 and 7). A similar conclusion has also been drawn in Andrioli et al [2007] in which they found that SI amplitude is generally larger for (SI + ) than that for (SI − ).…”

Section: Discussionsupporting

confidence: 82%

“…The first and most dramatic magnetospheric response to the impact of FFSs are characterized by positive sudden impulses (SI + ) in the horizontal component of the geomagnetic field measured by magnetometers located in the space (Patel & Coleman 1970;Huttunen et al 2005;Wang et al 2010;Su et al 2015;Rudd et al 2019) and on the ground (Siscoe et al 1968;Smith et al 1986;Takeuchi et al 2002b;Rudd et al 2019), as a consequence of a sudden increase of the solar wind dynamic pressure (Russell et al 1994a,b;Echer et al 2005;Wang et al 2010;Rudd et al 2019). On the other hand, in the case of FRSs, the sudden impulse response is negative (SI − ) as geospace and ground magnetometers observe negative excursions in the horizontal component of the geomagnetic field (Akasofu 1964;Takeuchi et al 2002a;Andrioli et al 2006;Zhang et al 2010). This is due to magnetospheric expansions caused by solar wind dynamic pressure decreases such as those associated with FRS/solar wind discontinuity impacts (Joselyn & Tsurutani 1990;Araki 1994;Zhang et al 2010;Vichare et al 2014).…”

Section: Introductionmentioning

confidence: 99%

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ULF waves excited by negative/positive solar wind dynamic pressure impulses at geosynchronous orbit

et al. 2010

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1] When a solar wind dynamic pressure impulse impinges on the magnetophere, ultralow-frequency (ULF) waves can be excited in the magnetosphere and the solar wind energy can be transported from interplanetary space into the inner magnetosphere. In this paper, we have systematically studied ULF waves excited at geosynchronous orbit by both positive and negative solar wind dynamic pressure pulses. We have identified 270 ULF events excited by positive solar wind dynamic pressure pulses and 254 ULF events excited by negative pulses from 1 January 2001 to 31 March 2009. We have found that the poloidal and toroidal waves excited by positive and negative pressure pulses oscillate in a similar manner of phase near 06:00 local time (LT) and 18:00 LT, but in antiphase near 12:00 LT and 0:00 LT. Furthermore, it is shown that excited ULF oscillations are in general stronger around local noon than those in the dawn and dusk flanks. It is demonstrated that disturbances induced by negative impulses are weaker than those by positive ones, and the poloidal wave amplitudes are stronger than the toroidal wave amplitudes both in positive and negative events. The potential impact of these excited waves on energetic electrons at geosynchronous orbit has also been discussed.

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Section: Discussionsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

ULF waves excited by negative/positive solar wind dynamic pressure impulses at geosynchronous orbit

et al. 2010

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“…Because of the larger number of corotating streams in the descending and minimum phases of the solar cycle, fast reverse shocks were observed to have a higher relative occurrence in the solar minimum (24%) than in the solar maximum (9%; Echer et al 2003). There is regularity in the behavior of the shock variables (speed, temperature, density, and magnetic field B t ; Sagdeev & Kennel 1991;Echer et al 2003;Andrioli et al 2007;Tsurutani et al 2011b). For a fast forward shock, all observed variables show a positive jump across the shock.…”

Section: Reverse Shock From Stream-stream Interactionsmentioning

confidence: 99%

VARIATIONS OF THE MUON FLUX AT SEA LEVEL ASSOCIATED WITH INTERPLANETARY ICMEs AND COROTATING INTERACTION REGIONS

Augusto

Kopenkin

Navia

et al. 2012

ApJ

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We present the results of an ongoing survey on the association between the muon flux variation at ground level (3 m above sea level) registered by the Tupi telescopes (Niteri-Brazil, 22. • 9S, 43. • 2W, 3 m) and the Earth-directed transient disturbances in the interplanetary medium propagating from the Sun (such as coronal mass ejections (CME), and corotating interaction regions (CIRs)). Their location inside the South Atlantic Anomaly region enables the muon telescopes to achieve a low rigidity of response to primary and secondary charged particles. The present study is primarily based on experimental events obtained by the Tupi telescopes in the period from 2010 August to 2011 December. This time period corresponds to the rising phase of solar cycle 24. The Tupi events are studied in correlation with data obtained by space-borne detectors (SOHO, ACE, GOES). Identification of interplanetary structures and associated solar activity was based on the nomenclature and definitions given by the satellite observations, including an incomplete list of possible interplanetary shocks observed by the CELIAS/MTOF Proton Monitor on the Solar and Heliospheric Observatory (SOHO) spacecraft. Among 29 experimental events reported in the present analysis, there are 15 possibly associated with the CMEs and sheaths, and 3 events with the CIRs (forward or reverse shocks); the origin of the remaining 11 events has not been determined by the satellite detectors. We compare the observed time (delayed or anticipated) of the muon excess (positive or negative) signal on Earth (the Tupi telescopes) with the trigger time of the interplanetary disturbances registered by the satellites located at Lagrange point L1 (SOHO and ACE). The temporal correlation of the observed ground-based events with solar transient events detected by spacecraft suggests a real physical connection between them. We found that the majority of observed events detected by the Tupi experiment were delayed in relation to the satellite triggers. This result agrees with theoretical expectations. Our experimental data indicate that the Tupi experiment is able to add new information and can be complementary to other techniques designed to interpret the origin of some interplanetary disturbances observed by satellites.

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Enhanced response of thermospheric cooling emission to negative pressure pulse

Bag,

Ogawa

2024

Sci Rep

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Nitric oxide (NO) emission via 5.3 µm wavelength plays dominant role in regulating the thermospheric temperature due to thermostat nature. The response of NO 5.3 mm emission to the negative pressure impulse during November 06–09, 2010 is studied by using Sounding of Atmosphere by Broadband Emission Radiometry (SABER) observations onboard the Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED) satellite and model simulations. The TIMED/SABER satellite observations demonstrate a significant enhancement in the high latitude region. The Open Geospace General Circulation Model (OpenGGCM), Weimer model simulations and Active Magnetosphere and Planetary Electrodynamics Response Experiment measurements exhibit intensification and equatorward expansion of the field-aligned-currents (FACs) post-negative pressure impulse period due to the expansion of the dayside magnetosphere. The enhanced FACs drive precipitation of low energy particle flux and Joule heating rate affecting whole magnetosphere–ionosphere–thermosphere system. Our study based on electric fields and conductivity derived from the EISCAT Troms$${\o }$$ ø radar and TIEGCM simulation suggests that the enhanced Joule heating rate and the particle precipitations prompt the increase in NO cooling emission.

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Positive and negative sudden impulses caused by fast forward and reverse interplanetary shocks

Cited by 4 publications

References 11 publications

ULF waves excited by negative/positive solar wind dynamic pressure impulses at geosynchronous orbit

ULF waves excited by negative/positive solar wind dynamic pressure impulses at geosynchronous orbit

VARIATIONS OF THE MUON FLUX AT SEA LEVEL ASSOCIATED WITH INTERPLANETARY ICMEs AND COROTATING INTERACTION REGIONS

Enhanced response of thermospheric cooling emission to negative pressure pulse

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