Burst regimes of long-period irregular pulsations at frequencies of 2.0–6.0 mHz and substorm activity in the nightside magnetosphere

Kurazhkovskaya, N. A.; Klain, B. I.

doi:10.1134/s0016793209040057

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…Statistics of the IPCL bursts shows that > 80% of bursts in the dayside cusp [Kurazkovskaya and Klain, 2009] occur at the background of developing substorm in the nightside auroral oval. Just before break-up Vorobiev et al [1992] observed a decrease of the intensity of dayside aurora with duration 3-8 min, most evident in the "green" (557.7 nm) line, whereas the "red" (630.0 nm) line intensity remained practically unchanged.…”

Section: Coupling Between the Cusp-associated Ulf Activity And Nighttmentioning

confidence: 99%

Virtual magnetograms -- a tool for the study of geomagnetic response to the solar wind/IMF driving

Козырева¹,

Pilipenko²,

Soloviev³

et al. 2019

Russ. J. Earth Sci.

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Processes of the solar-wind/magnetosphere interaction can be monitored by magnetic records on the ground from the worldwide array of stations. However, a serious drawback of the analysis of ground-based magnetograms is the inevitable variation of the magnetic response due to continual changes of the station location. An ideal, but impossible, solution of this difficulty, that will help to discriminate temporal and spatial variations, would be the deployment of a "stationary" in situ observatory with a fixed position in the solarmagnetospheric coordinate system. However, the desired result can be obtained with the proposed technique of "virtual magnetograms" (VMs). This technique has been implemented for key magnetospheric domains (midnight auroral and noon cusp regions) as an additional tool for monitoring the response of the geomagnetic field to solar wind and interplanetary magnetic field forcing. A VM is reconstructed by 2D gridding and interpolation of 1-min magnetograms from > 200 magnetic stations distributed worldwide. VMs have been produced for the period since 1994 up to the current year for both Northern and Southern hemispheres. A wide range of space physics studies, such as the solar wind-magnetosphere interaction, dayside-nightside coupling, etc. will benefit from the introduction of the VMs. The VMs for the dayside cusp and midnight auroral regions in both hemispheres, as well as simultaneous interplanetary parameters (solar wind density, electric field) and geomagnetic indices (, SYMH, and PC), are combined in one plot. These quick-look plots and corresponding digital files are freely available via the web site http://vm.gcras.ru for all interested researchers for testing and validation. Here we present examples of VMs for the following phenomena: a sawtooth event, modulation of the dayside cusp by IMF variations, and coupling between the dayside cusp ULF activity and substorms. VM database may make the selection of events for subsequent in-depth analysis much easier.

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Section: Coupling Between the Cusp-associated Ulf Activity And Nighttmentioning

confidence: 99%

Virtual magnetograms -- a tool for the study of geomagnetic response to the solar wind/IMF driving

Козырева¹,

Pilipenko²,

Soloviev³

et al. 2019

Russ. J. Earth Sci.

View full text Add to dashboard Cite

show abstract

“…The ipcl morphological regularities are considered in many native and foreign publications, e.g., (Bolsha kova et al, 1975;Friis Christensen et al, 1988;Dun lop et al, 1992;Kurazhkovskaya and Klain, 1997, 2009Kleimenova et al, 1998;Vennerstrom, 1999;Pilipenko et al, 2015). The spatiotemporal, spectral, polarization, fractal, and other characteristics of ipcl, which are observed under the conditions of a moder ately disturbed magnetosphere (Kp ~ 2-3), have been studied most thoroughly.…”

Section: Introductionmentioning

confidence: 99%

“…The spatiotemporal, spectral, polarization, fractal, and other characteristics of ipcl, which are observed under the conditions of a moder ately disturbed magnetosphere (Kp ~ 2-3), have been studied most thoroughly. It is sufficient to note here the cycle of works , 2009 in which the series of ipcl bursts is analyzed. Ipcl singularities at high geo magnetic activity (during geomagnetic storms) were analyzed in several works (Kurazhkovskaya and Klain, 1995;Kleimenova et al, 2000;Klain and Kurazhkov skaya, 2003).…”

Section: Introductionmentioning

confidence: 99%

Long-period irregular pulsations under the conditions of a quiet magnetosphere

2016

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Simultaneous observations of high latitude long period irregular pulsations at frequencies of 2.0-6.0 mHz (ipcl) and magnetic field disturbances in the solar wind plasma at low geomagnetic activity (Kp ~ 0) have been studied. The 1 s data on the magnetic field registration at Godhavn (GDH) high latitude observa tory and the 1 min data on the solar wind plasma and IMF parameters for 2011-2013 were used in an anal ysis. Ipcl (irregular pulsations continuous, long), which were observed against a background of the IMF Bz reorientation from northward to southward, have been analyzed. In this case other solar wind plasma and IMF parameters, such as velocity V, density n, solar wind dynamic pressure P = ρV 2 (ρ is plasma density), and strength magnitude B, were relatively stable. The effect of the IMF Bz variation rate on the ipcl spectral composition and intensity has been studied. It was established that the ipcl spectral density reaches its maxi mum (~10-20 min) after IMF Bz sign reversal in a predominant number of cases. It was detected that the ipcl average frequency (f) is linearly related to the IMF Bz variation rate (ΔBz/Δt). It was shown that the depen dence of f on ΔBz/Δt is controlled by the α = arctan(By/Bx) angle value responsible for the MHD disconti nuity type at the front boundary of magnetosphere. The results made it possible to assume that the formation of the observed ipcl spectrum, which is related to the IMF Bz reorientation, is caused by solar wind plasma turbulence, which promotes the development of current sheet instability and surface wave amplification at the magnetopause.

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Isolated bursts of irregular geomagnetic pulsations in the region of the dayside cusp

Kurazhkovskaya

Klain

2017

Geomagn. Aeron.

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Burst regimes of long-period irregular pulsations at frequencies of 2.0–6.0 mHz and substorm activity in the nightside magnetosphere

Cited by 4 publications

References 11 publications

Virtual magnetograms -- a tool for the study of geomagnetic response to the solar wind/IMF driving

Virtual magnetograms -- a tool for the study of geomagnetic response to the solar wind/IMF driving

Long-period irregular pulsations under the conditions of a quiet magnetosphere

Isolated bursts of irregular geomagnetic pulsations in the region of the dayside cusp

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