In search of a new ULF wave index: Comparison of Pc5 power with dynamics of geostationary relativistic electrons

Козырева, О. В.; Pilipenko, Vyacheslav; Engebretson, M. J.; Yumoto, K.; Watermann, J.; Romanova, N. V.

doi:10.1016/j.pss.2006.03.013

Cited by 84 publications

(105 citation statements)

References 35 publications

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“…Based on precise case studies, Kim et al (2009) have shown that enhanced levels of IMF fluctuations are related to fluctuating particle flows in the plasma sheet and the enhanced occurrence of onsets in comparison with intervals of non-fluctuating IMF. This result confirms the conclusion of Kozyreva et al (2007) about the key role that ULF waves observed at high latitudes in the Pc5/Pi3 frequency range play in the energy transfer from the solar wind to the magnetosphere. The basic energy supply channel is reconnection, operated under negative IMF, and viscous interaction, which becomes noticeable under positive IMF.…”

Section: Spe Results For Pre-substorm and Non-substorm Intervalssupporting

confidence: 90%

Non-triggered auroral substorms and long-period (1–4 mHz) geomagnetic and auroral luminosity pulsations in the polar cap

et al. 2017

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Abstract. A study is undertaken into parameters of the polar auroral and geomagnetic pulsations in the frequency range 1-4 mHz (Pc5/Pi3) during quiet geomagnetic intervals preceding auroral substorms and non-substorm background variations. Special attention is paid to substorms that occur under parameters of the interplanetary magnetic field (IMF) conditions typical for undisturbed days ("non-triggered substorms"). The spectral parameters of pulsations observed in auroral luminosity as measured by a meridian scanning photometer (Svalbard) in the polar cap and near the polar boundary of the auroral oval are studied and compared with those for the geomagnetic pulsations measured by the magnetometer network IMAGE in the same frequency range. It is found that Pc5/Pi3 power spectral density (PSD) is higher during pre-substorm time intervals than for non-substorm days and that specific variations of pulsation parameters ("substorm precursors") occur during the last 2-4 pre-substorm hours.

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Section: Spe Results For Pre-substorm and Non-substorm Intervalssupporting

confidence: 90%

Non-triggered auroral substorms and long-period (1–4 mHz) geomagnetic and auroral luminosity pulsations in the polar cap

et al. 2017

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“…During the recovery phase of the 31 October storm the SW velocity was very high, just gradually decreasing from ∼ 1200 km s −1 to ∼ 900 km s −1 . The ULF wave activity occurred during certain time periods, as evidenced by the ULF wave power index (Kozyreva et al, 2007) (Fig. 2, bottom panel).…”

Section: The Event Of 29-31 October 2003mentioning

confidence: 97%

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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“…Motivated by the potential importance of enhanced ULF wave activity for particle energization in radiation belts and hence space weather effects, Kozyreva et al (2007) and Romanova and Pilipenko (2009) proposed the calculation of the ULF wave index in the Pc5 band from ground-based magnetometer data, and, more recently, Pilipenko et al (2017) outlined possible directions of this index advancement. Waters and Menk (2016) suggested that a ground Pc3 pulsation index may be useful for identifying contamination by background activity in geomagnetic and aeromagnetic surveys used in geophysical exploration.…”

Section: Data Processing and Analysis Techniquementioning

confidence: 99%

An initial ULF wave index derived from 2 years of Swarm observations

et al. 2018

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Abstract. The ongoing Swarm satellite mission provides an opportunity for better knowledge of the near-Earth electromagnetic environment. Herein, we use a new methodological approach for the detection and classification of ultra lowfrequency (ULF) wave events observed by Swarm based on an existing time-frequency analysis (TFA) tool and utilizing a state-of-the-art high-resolution magnetic field model and Swarm Level 2 products (i.e., field-aligned currents -FACs -and the Ionospheric Bubble Index -IBI). We present maps of the dependence of ULF wave power with magnetic latitude and magnetic local time (MLT) as well as geographic latitude and longitude from the three satellites at their different locations in low-Earth orbit (LEO) for a period spanning 2 years after the constellation's final configuration. We show that the inclusion of the Swarm single-spacecraft FAC product in our analysis eliminates all the wave activity at high altitudes, which is physically unrealistic. Moreover, we derive a Swarm orbit-by-orbit Pc3 wave (20-100 MHz) index for the topside ionosphere and compare its values with the corresponding variations of solar wind variables and geomagnetic activity indices. This is the first attempt, to our knowledge, to derive a ULF wave index from LEO satellite data. The technique can be potentially used to define a new Level 2 product from the mission, the Swarm ULF wave index, which would be suitable for space weather applications.

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In search of a new ULF wave index: Comparison of Pc5 power with dynamics of geostationary relativistic electrons

Cited by 84 publications

References 35 publications

Non-triggered auroral substorms and long-period (1–4 mHz) geomagnetic and auroral luminosity pulsations in the polar cap

Non-triggered auroral substorms and long-period (1–4 mHz) geomagnetic and auroral luminosity pulsations in the polar cap

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

An initial ULF wave index derived from 2 years of Swarm observations

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In search of a new ULF wave index: Comparison of Pc5 power with dynamics of geostationary relativistic electrons

Cited by 84 publications

References 35 publications

Non-triggered auroral substorms and long-period (1–4 mHz) geomagnetic and auroral luminosity pulsations in the polar cap

Non-triggered auroral substorms and long-period (1–4 mHz) geomagnetic and auroral luminosity pulsations in the polar cap

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

An initial ULF wave index derived from 2 years of Swarm observations

Contact Info

Product

Resources

About

Non-triggered auroral substorms and long-period (1–4 mHz) geomagnetic and auroral luminosity pulsations in the polar cap

Non-triggered auroral substorms and long-period (1–4 mHz) geomagnetic and auroral luminosity pulsations in the polar cap