Global Pc5 event during 29–31 October 2003 magnetic storm

Potapov, A. S.; Guglielmi, A. V.; Цэгмэд, Б.; Kultima, J.

doi:10.1016/j.asr.2006.05.010

Cited by 28 publications

(15 citation statements)

References 6 publications

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“…and Figure 4.). We end up with that there is no contradiction between the findings of Potapov et al 2006;2009 [3]; [2] concerning global Pc 5 pulsations and our results here. Since the solar wind flow pressure oscillations associated with co-rotating interaction region events could be the possible candidate of the occurrence mechanisms of our low-latitude globalmode Pc 5 pulsations.…”

contrasting

confidence: 75%

“…(2) The durations of the global Pc 5's are usually more than 2 hours while the durations of the local Pc 5's lie between 0.5 and 1.5 hours. It was also separately reported that some global Pc 5 pulsations were observed during one of the stages of geomagnetic storms (e.g., [3]). It is worth noting that there are different types of Pc 5 pulsations occurring in global scale.…”

Section: Introductionmentioning

confidence: 96%

“…), which is almost a moderate value (not high as: >500 km/s) and it was accustomed that the conditions on the solar wind speed should sustain high speed so that global Pc 5 pulsations would be favorable to occur e.g. Potapov et al 2006;2009 [3]; [2]. They overviewed the favorable conditions on the solar wind and magnetosphere for the occurrence of the global Pc 5 pulsations and they found that high solar wind speed/velocity is the dominating condition should be sustained for the occurrence of global Pc 5 pulsations.…”

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confidence: 99%

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The relation between amplitudes of a global-mode Pc 5 pulsations and geosynchronous electron fluxes

Suliman

Yoshikawa

Yumoto

et al. 2013

2013 IEEE International Conference on Space Science and Communication (IconSpace)

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Associative relationship between magnetospheric ULF waves in the Pc 5 range (1.7-6.7 mHz) and high energetic particles on the geosynchronous orbit has been investigated in detail in past studies. In particular, there has been interest in the efficiency of global Pc 5 waves, i.e., those having small m-numbers, in accelerating particles [1]. In this paper we investigated this feature by using energetic electron fluxes at geosynchronous orbits, and by using low-latitude globalmode Pc 5 pulsations: We used superposed epoch analyses to show correlations.In more detail, we have identified the global-mode Pc 5 geomagnetic pulsations as large-amplitude Pc 5's simultaneously observed at three low-latitude ground stations belonging to the Magnetic Data Acquisition System (MAGDAS), selected from different sectors of the globe (i.e., Europe-Africa, Japan and America sectors). The specific selection criteria of the global mode of Pc 5 pulsation are as follows: Each Pc 5 event at each station must have amplitudes larger than 0.4 nT, and life periods longer than two hours: Such criteria are relatively strict compared with past studies, but are suitable for continuous monitoring of Pc 5 pulsations.We found positive correlation between the low-latitude ground global-mode Pc 5 amplitudes and the geosynchronous energetic (E>0.6 MeV) electron flux, and found that the electron flux enhancement followed the Pc 5 amplitude enhancement; this is consistent with past studies. It is significant to compare this low-latitude global mode with low-latitude local-mode Pc 5 pulsations: This is the next subject for our ongoing research. Keywords-Global Pc 5 pulsations, ULF Pc 5 pulsations and energetic electrons, Pc5-ground observations.

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confidence: 75%

Section: Introductionmentioning

confidence: 96%

mentioning

confidence: 99%

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The relation between amplitudes of a global-mode Pc 5 pulsations and geosynchronous electron fluxes

Suliman

Yoshikawa

Yumoto

et al. 2013

2013 IEEE International Conference on Space Science and Communication (IconSpace)

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“…The most intense Pc5 waves, with amplitudes exceeding by an order of magnitude those of common Pc5 pulsations, are observed during the recovery phase of severe magnetic storms (Trivedi et al, 1997;Kleimenova and Kozyreva, 2005). These anomalously strong pulsations are referred to as global Pc5 pulsations (Potapov et al, 2006) because they were observed simultaneously in the morning and evening sectors over a wide range of latitudes. Their amplitude is comparable to the amplitude of moderate substorms, and their intensities at geostationary orbit reach ∼ 50 % of the magnetospheric field.…”

Section: Published By Copernicus Publications On Behalf Of the Europementioning

confidence: 99%

Global Pc5 pulsations during strong magnetic storms: excitation mechanisms and equatorward expansion

et al. 2014

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Abstract. The dynamics of global Pc5 waves during the magnetic storms on 29-31 October 2003 are considered using data from the trans-American and trans-Scandinavian networks of magnetometers in the morning and post-noon magnetic local time (MLT) sectors. We study the latitudinal distribution of Pc5 wave spectral characteristics to determine how deep into the magnetosphere these Pc5 waves can extend at different flanks of the magnetosphere. The wave energy transmission mechanisms are different during 29-30 October and 31 October wave events. Further, we examine whether the self-excited Kelvin-Helmholtz instability is sufficient as an excitation mechanism for the global Pc5 waves. We suggest that on 31 October a magnetospheric magnetohydrodynamic (MHD) waveguide was excited, and the rigid regime of its excitation was triggered by enhancements of the solar wind density. The described features of Pc5 wave activity during recovery phase of strong magnetic storm are to be taken into account during the modeling of the relativistic electron energization by ultra-low-frequency (ULF) waves.Keywords. Magnetospheric physics (MHD waves and instabilities; storms and substorms) -space plasma physics (kinetic and MHD theory)

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“…The reason for such outstanding intensity has not been found yet. Global Pc5 waves are coherent over a wide range of geomagnetic latitudes, during morning and post-noon hours (Potapov et al 2006). Detailed studies of this event indicated that global Pc5 pulsations are probably caused by oscillations of the magnetospheric MHD waveguide, engulfing an entire magnetosphere, up to equatorial latitudes (Marin et al 2014).…”

Section: October 31 2003 Ulf Eventmentioning

confidence: 99%

Modulation of the ionosphere by Pc5 waves observed simultaneously by GPS/TEC and EISCAT

et al. 2016

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Earlier studies demonstrated that the monitoring of the ionospheric total electron content (TEC) by global satellite navigation systems is a powerful method to study the propagation of transient disturbances in the ionosphere, induced by internal gravity waves. This technique has turned out to be sensitive enough to detect ionospheric signatures of magnetohydrodynamic waves as well. However, the effect of TEC modulation by ULF waves is not well examined as a responsible mechanism has not been firmly identified. During periods with intense Pc5 waves distinct pulsations with the same periodicity were found in the TEC data from high-latitude GPS receivers in Scandinavia. We analyze jointly responses in TEC variations and EISCAT ionospheric parameters to global Pc5 pulsations during the recovery phase of the strong magnetic storms on October 31, 2003. Comparison of periodic fluctuations of the electron density at different altitudes from EISCAT data shows that main contribution into TEC pulsations is provided by the lower ionosphere, up to ~150 km, that is the E-layer and lower F-layer. This observational fact favors the TEC modulation mechanism by field-aligned plasma transport induced by Alfven wave. Analytical estimates and numerical modeling support the effectiveness of this mechanism. Though the proposed hypothesis is basically consistent with the analyzed event, the correspondence between magnetic and ionospheric oscillations is not always perfect, so further studies need to be conducted to understand fully the TEC modulations associated with Pc5 pulsations.

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Global Pc5 event during 29–31 October 2003 magnetic storm

Cited by 28 publications

References 6 publications

The relation between amplitudes of a global-mode Pc 5 pulsations and geosynchronous electron fluxes

The relation between amplitudes of a global-mode Pc 5 pulsations and geosynchronous electron fluxes

Global Pc5 pulsations during strong magnetic storms: excitation mechanisms and equatorward expansion

Modulation of the ionosphere by Pc5 waves observed simultaneously by GPS/TEC and EISCAT

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