Magnetospheric ULF Waves: A Review

Menk, F. W.

doi:10.1007/978-94-007-0501-2_13

Cited by 63 publications

(62 citation statements)

References 308 publications

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“…Traditionally, the continuous pulsations which are denoted by Pc1-5 can be divided into categories that are characterized by a given frequency range as summarized in Table 1 (e.g., Jacobs et al, 1964;Fraser, 2007;Menk, 2011). These waves provide an insight into magnetospheric dynamics including wave-particle interactions (mostly Pc1 and Pc2), the solar wind activity (Pc3 to Pc5; Takahashi et al, 1984;Takahashi and Ukhorskiy, 2008) and internal processes (e.g., Hartinger et al, 2014).…”

Section: Ulf Waves In the Magnetospherementioning

confidence: 99%

Investigation of a low-cost magneto-inductive magnetometer for space science applications

Regoli¹,

Moldwin²,

Pellioni³

et al. 2018

Geosci. Instrum. Method. Data Syst.

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Abstract.A new sensor for measuring low-amplitude magnetic fields that is ideal for small spacecraft is presented. The novel measurement principle enables the fabrication of a low-cost sensor with low power consumption and with measuring capabilities that are comparable to recent developments for CubeSat applications. The current magnetometer, a software-modified version of a commercial sensor, is capable of detecting fields with amplitudes as low as 8.7 nT at 40 Hz and 2.7 nT at 1 Hz, with a noise floor of 4 pT/ √ Hz at 1 Hz. The sensor has a linear response to less than 3 % over a range of ±100 000 nT. All of these features make the magneto-inductive principle a promising technology for the development of magnetic sensors for both space-borne and ground-based applications to study geomagnetic activity.

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Section: Ulf Waves In the Magnetospherementioning

confidence: 99%

Investigation of a low-cost magneto-inductive magnetometer for space science applications

Regoli¹,

Moldwin²,

Pellioni³

et al. 2018

Geosci. Instrum. Method. Data Syst.

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“…On the other hand, fluctuations at higher frequencies are, more likely, signatures of field line resonances (FLRs) occurring on lower-latitude closed field lines which each station approaches at its own local noon (Lepidi et al, 1999;De Lauretis et al, 2009). Conversely, during the nighttime, when the power is lower, the fluctuations are coherent independently of frequency; this result can be explained in terms of substorm-related phenomena (Menk, 2011), which extend to a large portion of the nightside magnetosphere, as observed in the 11 March 2008 event (Fig. 10), as well as in terms of specific cap activity which is characterized by low-amplitude, coherent fluctuations (Yagova et al, 2004).…”

Section: Summary and Discussionmentioning

confidence: 99%

A study of geomagnetic field variations along the 80° S geomagnetic parallel

et al. 2017

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Abstract. The availability of measurements of the geomagnetic field variations in Antarctica at three sites along the 80 • S geomagnetic parallel, separated by approximately 1 h in magnetic local time, allows us to study the longitudinal dependence of the observed variations. In particular, using 1 min data from Mario Zucchelli Station, Scott Base and Talos Dome, a temporary installation during [2007][2008] Antarctic campaign, we investigated the diurnal variation and the low-frequency fluctuations (approximately in the Pc5 range, ∼ 1-7 mHz). We found that the daily variation is clearly ordered by local time, suggesting a predominant effect of the polar extension of midlatitude ionospheric currents. On the other hand, the pulsation power is dependent on magnetic local time maximizing around magnetic local noon, when the stations are closer to the polar cusp, while the highest coherence between pairs of stations is observed in the magnetic local nighttime sector. The wave propagation direction observed during selected events, one around local magnetic noon and the other around local magnetic midnight, is consistent with a solar-wind-driven source in the daytime and with substorm-associated processes in the nighttime.

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“…FFT seems to outperform the continuous wavelet transform in automated detection approaches, but the Morlet wavelet is better where the signal changes rapidly (Menk, 2011). Chi and Russell (2007) proposed the selection in the Wigner-Ville distribution to be based on the comparison with background noise for any assigned confidence interval.…”

Section: Data Processing and Analysismentioning

confidence: 99%

Multi-satellite study of the excitation of Pc3 and Pc4-5 ULF waves and their penetration across the plasmapause during the 2003 Halloween superstorm

et al. 2015

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Abstract. We use multi-satellite and ground-based magnetic data to investigate the concurrent characteristics of Pc3 (22-100 mHz) and Pc4-5 (1-22 mHz) ultra-low-frequency (ULF) waves on the 31 October 2003 during the Halloween magnetic superstorm. ULF waves are seen in the Earth's magnetosphere, topside ionosphere, and Earth's surface, enabling an examination of their propagation characteristics. We employ a time-frequency analysis technique and examine data from when the Cluster and CHAMP spacecraft were in good local time (LT) conjunction near the dayside noon-midnight meridian. We find clear evidence of the excitation of both Pc3 and Pc4-5 waves, but more significantly we find a clear separation in the L shell of occurrence of the Pc4-5 and Pc3 waves in the equatorial inner magnetosphere, separated by the density gradients at the plasmapause boundary layer. A key finding of the wavelet spectral analysis of data collected from the Geotail, Cluster, and CHAMP spacecraft and the CARISMA and GIMA magnetometer networks was a remarkably clear transition of the waves' frequency into dominance in a higher-frequency regime within the Pc3 range. Analysis of the local field line resonance frequency suggests that the separation of the Pc4-5 and Pc3 emissions across the plasmapause is consistent with the structure of the inhomogeneous field line resonance Alfvén continuum. The Pc4-5 waves are consistent with direct excitation by the solar wind in the plasma trough, as well as Pc3 wave absorption in the plasmasphere following excitation by upstream waves originating at the bow shock in the local noon sector. However, despite good solar wind coverage, our study was not able to unambiguously identify a clear explanation for the sharp universal time (UT) onset of the discrete frequency and largeamplitude Pc3 wave power.

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Magnetospheric ULF Waves: A Review

Cited by 63 publications

References 308 publications

Investigation of a low-cost magneto-inductive magnetometer for space science applications

Investigation of a low-cost magneto-inductive magnetometer for space science applications

A study of geomagnetic field variations along the 80° S geomagnetic parallel

Multi-satellite study of the excitation of Pc3 and Pc4-5 ULF waves and their penetration across the plasmapause during the 2003 Halloween superstorm

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Magnetospheric ULF Waves: A Review

Cited by 63 publications

References 308 publications

Investigation of a low-cost magneto-inductive magnetometer for space science applications

Investigation of a low-cost magneto-inductive magnetometer for space science applications

A study of geomagnetic field variations along the 80° S geomagnetic parallel

Multi-satellite study of the excitation of Pc3 and Pc4-5 ULF waves and their penetration across the plasmapause during the 2003 Halloween superstorm

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A study of geomagnetic field variations along the 80° S geomagnetic parallel