Bursts of ULF noise excited by sudden changes of solar wind dynamic pressure

Safargaleev, V. V.; Kangas, J.; Kozlovsky, Alexander; Vasilyev, A. N.

doi:10.5194/angeo-20-1751-2002

Cited by 14 publications

(9 citation statements)

References 17 publications

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“…2 and 13c), which is consistent with the assumption that the generation region of the bursts is limited in radial direction in the magnetosphere (Safargaleev et al, 2002). Pulsations of Pc 1 band are commonly accepted as the Alfvén waves generated via the development of electromagnetic ion-cyclotron (EMIC) instability.…”

Section: Sc-initiated Magnetic Activity In the Frequency Range 01-3 Hzsupporting

confidence: 64%

“…In accordance with Tepley and Wentworth (1962) and Safargaleev et al (2002), approximately 20% of SWPPs are accompanied with excitation of a narrowband burst (or series of bursts) of rising frequency like that shown in Fig. 2b and Fig.…”

Section: Sc-initiated Magnetic Activity In the Frequency Range 01-3 Hzmentioning

confidence: 82%

“…Another form of ULF-response, which has also been previously mentioned in the literature (Safargaleev et al, 2002), is a series of two bursts at central frequency ∼1.2 Hz seen in the middle spectrogram in Fig. 2b after 13:30 UT and around 13:45 UT.…”

Section: Bursts Of Ulf Noise and Dayside Proton Aurorasmentioning

confidence: 96%

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Geomagnetic disturbances on ground associated with particle precipitation during SC

Safargaleev

Kozlovsky²,

Honary

et al. 2010

Ann. Geophys.

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Abstract.We have examined several cases of magnetosphere compression by solar wind pressure pulses using a set of instruments located in the noon sector of auroral zone. We have found that the increase in riometric absorption (sudden commencement absorption, SCA) occurred simultaneously with the beginning of negative or positive magnetic variations and broadband enhancement of magnetic activity in the frequency range above 0.1 Hz. Since magnetic variations were observed before the step-like increase of magnetic field at equatorial station (main impulse, MI), the negative declinations resembled the so-called preliminary impulse, PI. In this paper a mechanism for the generation of PI is introduced whereby PI's generation is linked to SCA -associated precipitation and the local enhancement of ionospheric conductivity leading to the reconstruction of the ionospheric current system prior to MI. Calculation showed that PI polarity depends on orientation of the background electric field and location of the observation point relative to ionospheric irregularity. For one case of direct measurements of electric field in the place where the ionospheric irregularity was present, the sign of calculated disturbance corresponded to the observed one. High-resolution measurements on IRIS facility and meridional chain of the induction magnetometers are utilized for the accurate timing of the impact of solar wind irregularity on the magnetopause.

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Section: Sc-initiated Magnetic Activity In the Frequency Range 01-3 Hzsupporting

confidence: 64%

Section: Sc-initiated Magnetic Activity In the Frequency Range 01-3 Hzmentioning

confidence: 82%

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Geomagnetic disturbances on ground associated with particle precipitation during SC

Safargaleev

Kozlovsky²,

Honary

et al. 2010

Ann. Geophys.

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“…In support of the conclusion by Fuselier et al, in every event, for which Lovozero was on the dayside, a specific kind of geomagnetic pulsations in the Pc1 range was registered. It is worth noting that this kind of pulsations has been studied by Safargaleev et al (2002) on the basis of ground magnetometer and DMSP data. The latter authors associated these pulsations with the localized precipitation of the 10-30 keV protons seen by DMSP and also interpreted these phenomena as the result of ion-cyclotron instability.…”

Section: Article In Pressmentioning

confidence: 99%

Energetic proton precipitation related to ion–cyclotron waves

Yahnin

Yahnina

2007

Journal of Atmospheric and Solar-Terrestrial Physics

106

100

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“…The total duration of this type of pulsations during a 25‐months' period was ∼200 h [ Fukunishi et al , 1981], that is, the probability to observe these emissions was around 1%. This type of pulsations (pulses of ULF waves in the frequency range from tenths to 1–2 Hz with duration of several minutes and irregular repetition intervals of some 10–20 min) closely relates to magnetospheric compressions [e.g., Anderson et al , 1996; Kangas et al , 2001; Safargaleev et al , 2002]. The HM emission bursts on the ground are observed on the dayside [ Fukunishi et al , 1981] as well as their magnetospheric counterpart [ Anderson and Hamilton , 1993; Anderson et al , 1996].…”

Section: Introductionmentioning

confidence: 99%

Evidence for subauroral proton flashes on the dayside as the result of the ion cyclotron interaction

et al. 2008

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A series of proton aurora flashes produced by the precipitation of energetic protons equatorward of the main auroral oval was observed between 0700 and 1300 UT on 31 May 2005 on the dayside with the Imager for Magnetopause‐to‐Auroral Global Exploration (IMAGE) Far Ultraviolet (FUV) imager. At the same time multiple bursts of geomagnetic pulsations within the Pc1 range known as “hydromagnetic emission bursts” were observed on several ground stations located in the conjugate MLT sector. The pulsation bursts are well correlated with the appearance of the proton aurora conjugated with the ground stations. The frequency width of the pulsation burst correlates and the upper frequency anticorrelates, respectively, with the latitudinal width and lowest latitude of the proton aurora at the meridian of the ground station. Observations at the meridional network of pulsation magnetometers show that the maximum pulsation spectral density is detected at stations conjugated with proton flashes. The close relationship between pulsations and proton precipitation (aurora) indicates their common source. We conclude that the source is the cyclotron instability of the ring current ions that is stimulated by impulsive magnetospheric compressions. The magnetosphere compressions are, indeed, confirmed by plasma data from the Geotail spacecraft in the duskside magnetosheath. They show a series of plasma pressure pulses during the time interval of interest. Also standard midlatitude magnetograms indicate large‐scale magnetospheric compressions.

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Bursts of ULF noise excited by sudden changes of solar wind dynamic pressure

Cited by 14 publications

References 17 publications

Geomagnetic disturbances on ground associated with particle precipitation during SC

Geomagnetic disturbances on ground associated with particle precipitation during SC

Energetic proton precipitation related to ion–cyclotron waves

Evidence for subauroral proton flashes on the dayside as the result of the ion cyclotron interaction

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