Long-period pulsations of the Earth's magnetic field with periods more than 20 minutes before proton flares on the sun

Kobrin, M. M.; Малыгин, В. И.; Snegirev, S. D.

doi:10.1016/0032-0633(85)90003-0

“…The possibility of geomagnetic precursors of large, geoeffective solar flares -longperiod variations of the geomagnetic field -has been studied in Kobrin et al (1985). These precursors are global enhancements of geomagnetic variations with time scales 20-60 min about 1-3 days before the flare.…”

Section: High-frequency Effects On Coronal Mhd Wavesmentioning

confidence: 99%

Magnetohydrodynamic Oscillations in the Solar Corona and Earth’s Magnetosphere: Towards Consolidated Understanding

Nakariakov

¹

,

Пилипенко

²

,

Heilig³

et al. 2016

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Magnetohydrodynamic (MHD) oscillatory processes in different plasma systems, such as the corona of the Sun and the Earth's magnetosphere show interesting similarities and differences, which so far received little attention and remain underexploited. The successful commissioning within the past ten years of SDO, Hinode, STEREO and THEMIS spacecraft, in combination with matured analysis of data from earlier spacecraft (Wind, SOHO, ACE, Cluster, TRACE and RHESSI) makes it very timely to survey the breadth of observations giving evidence for MHD oscillatory processes in solar and space plasmas, and state-of-the-art theoretical modelling. The paper reviews several important topics, such as Alfvénic resonances and mode conversion; MHD waveguides, such as the magnetotail, coronal loops, coronal streamers; mechanisms for periodicities produced in energy releases during substorms and solar flares, possibility of Alfvénic resonators along open field lines; possible drivers of MHD waves; diagnostics of plasmas with MHD waves; interaction of MHD waves with partly-ionised boundaries (ionosphere and chromosphere). The review is mainly oriented to specialists in magnetospheric physics and solar physics, but not familiar with specifics of the adjacent research fields.

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“…Variations in the spectra of geomagnetic field fluctuations in data from both ground observatories and geostationary spacecraft before solar proton events have been repeatedly observed by many investigators [Cheng, 1991;Kobrin et al, 1985].…”

Section: Magnetic Field Measurements In Yakutskmentioning

confidence: 86%

Analyzing solar, cosmic, and geophysical events in September 2017 using SHISRA SB RAS complex observations

Starodubtsev¹,

Baishev²,

Baishev

³

et al. 2019

Solar-Terrestrial Physics

4

0

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We report the results of monitoring of cosmic rays and geomagnetic field along 210 magnetic meridians in Yakutia in the first half of September 2017. The energy spectrum of solar cosmic rays during Ground Level Enhancement in September 10, 2017 is estimated as J=3027E–1.99exp(–E/729 MeV). We present the results of the forecast and complex analysis of the magnetic storm on September 7–9, 2017 with Dst=–124 nT. The forecast lead time is about one day. We examine how the storm affected the electric potential and VLF signal propagation from RSDN-20 radio navigation stations. Irregular Pi3–Pi1 pulsations occurred during the September 8, 2017 magnetic storm from 12 to 20 UT. The pulsations were accompanied by variations in electrotelluric potentials and geomagnetic fields with the correlation coefficient between them ρ(E, H)=0.5÷0.9. The effects of the magnetic storm manifested themselves as an increase in the attenuation and a decrease in the phase delay of VLF radio signals.

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“…Изменения в спектрах флуктуаций магнитного поля Земли как в данных наземных обсерваторий, так и на геостационарных космических аппаратах перед солнечными протонными событиями неоднократно отмечались многими исследователями [Cheng, 1991;Kobrin et al, 1985]. Поэтому определенный интерес представляет прослеживание динамики спектров флуктуаций полного вектора напряженности магнитного поля F в Якутске во время событий в сентябре 2017 г. Это тем более важно, что возмущенность земного магнитного поля определяется состоянием космической погоды, исследования которой в настоящее время актуальны.…”

Section: измерения магнитного поля в якутскеunclassified

Analyzing solar, cosmic, and geophysical events in September 2017 using SHISRA SB RAS complex observations

Starodubtsev¹,

Baishev²,

Baishev

³

et al. 2019

Solnechno-Zemnaya Fizika

View full text Add to dashboard Cite

We report the results of monitoring of cosmic rays and geomagnetic field along 210 magnetic meridians in Yakutia in the first half of September 2017. The energy spectrum of solar cosmic rays during Ground Level Enhancement in September 10, 2017 is estimated as J=3027E–1.99exp(–E/729 MeV). We present the results of the forecast and complex analysis of the magnetic storm on September 7–9, 2017 with Dst=–124 nT. The forecast lead time is about one day. We examine how the storm affected the electric potential and VLF signal propagation from RSDN-20 radio navigation stations. Irregular Pi3–Pi1 pulsations occurred during the September 8, 2017 magnetic storm from 12 to 20 UT. The pulsations were accompanied by variations in electrotelluric potentials and geomagnetic fields with the correlation coefficient between them ρ(E, H)=0.5÷0.9. The effects of the magnetic storm manifested themselves as an increase in the attenuation and a decrease in the phase delay of VLF radio signals.

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Long-period pulsations of the Earth's magnetic field with periods more than 20 minutes before proton flares on the sun

Cited by 5 publications

References 6 publications

Magnetohydrodynamic Oscillations in the Solar Corona and Earth’s Magnetosphere: Towards Consolidated Understanding

Magnetohydrodynamic Oscillations in the Solar Corona and Earth’s Magnetosphere: Towards Consolidated Understanding

Analyzing solar, cosmic, and geophysical events in September 2017 using SHISRA SB RAS complex observations

Analyzing solar, cosmic, and geophysical events in September 2017 using SHISRA SB RAS complex observations

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