ULF waves on the ground and in space

Pilipenko, V. A.

doi:10.1016/0021-9169(90)90087-4

Cited by 63 publications

(32 citation statements)

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“…The generation of the variable electromagnetic ®eld in a wide frequency range due to the movements of the neutral component in the ionosphere was studied in works of, for example, Gershman (1974) and Pogoreltzev (1989). The active role of the ionosphere is also discussed in reviews of Lysak (1990) and Pilipenko (1990). At the same time, it is widely believed that the azimuthally small-scale pulsations (e.g., poloidal Pc4, compressional Pc5) are excited by drift and wave-particle instabilities of the magnetospheric plasma.…”

Section: Discussionmentioning

confidence: 99%

Theory of azimuthally small-scale hydromagnetic waves in the axisymmetric magnetosphere with finite plasma pressure

Klimushkin

1998

Ann Geophysicae

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Abstract. The structure of monochromatic MHD-waves with large azimuthal wave number m ) 1 in a twodimensional model of the magnetosphere has been investigated. A joint action of the ®eld line curvature, ®nite plasma pressure, and transversal equilibrium current leads to the phenomenon that waves, standing along the ®eld lines, are travelling across the magnetic shells. The wave propagation region, the transparency region, is bounded by the poloidal magnetic surface on one side and by the resonance surface on the other. In their meaning these surfaces correspond to the usual and singular turning points in the WKB-approximation, respectively. The wave is excited near the poloidal surface and propagates toward the resonance surface where it is totally absorbed due to the ionospheric dissipation. There are two transparency regions in a ®nite-beta magnetosphere, one of them corresponds to the AlfveÂ n mode and the other to the slow magnetosound mode.

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Section: Discussionmentioning

confidence: 99%

Theory of azimuthally small-scale hydromagnetic waves in the axisymmetric magnetosphere with finite plasma pressure

Klimushkin

1998

Ann Geophysicae

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“…Geomagnetic pulsations were first observed in 1859 during aurora events (Stewart, 1861) Saito (1969) reviews geomagnetic pulsations and their classification, observations, and the generation mechanisms. This assessment remains a consistent work in the field and was followed by a number of updated reviews on more specific topics such as type of pulsation, frequency range of occurrence, and satellite observations, emphasizing geomagnetic pulsations relevance for a variety of Earth and space science studies (Raspopov and Lanzerotti, 1976;Pilipenko, 1990;Engebretson et al, 1991;Sazhin and Hayakawa, 1994;Takahashi, 1998;Kangas et al, 1998;Daglis et al, 1999;Olson, 1999;Yahnin and Yahnina, 2007;Zong et al, 2009). …”

Section: Geomagnetic Pulsationsmentioning

confidence: 94%

A Review of Low Frequency Electromagnetic Wave Phenomena Related to Tropospheric-Ionospheric Coupling Mechanisms

Simões¹,

Pfaff²,

Berthelier³

et al. 2011

Dynamic Coupling Between Earth’s Atmospheric and Plasma Environments

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Investigation of coupling mechanisms between the troposphere and the ionosphere requires a multidisciplinary approach involving several branches of atmospheric sciences, from meteorology, atmospheric chemistry, and fulminology to aeronomy, plasma physics, and space weather. In this work, we review low frequency electromagnetic wave propagation in the Earthionosphere cavity from a troposphere-ionosphere coupling perspective. We discuss electromagnetic wave generation, propagation, and resonance phenomena, considering atmospheric, ionospheric and magnetospheric sources, from lightning and transient luminous events at low altitude to Alfven waves and particle precipitation related to solar and magnetospheric processes. We review in situ ionospheric processes as well as surface and space weather phenomena that drive troposphere-ionosphere dynamics. Effects of aerosols, water vapor distribution, thermodynamic parameters, and cloud charge separation and electrification processes on atmospheric electricity and electromagnetic waves are reviewed. We also briefly revisit ionospheric irregularities such as spread-F and explosive spread-F, sporadic-E, traveling ionospheric disturbances, Trimpi effect, and hiss and plasma turbulence. Regarding the role of the lower boundary of the cavity, we review transient surface phenomena, including seismic activity, earthquakes, volcanic processes and dust electrification. The role of surface and https://ntrs.nasa.gov/search.jsp?R=20120011991 2019-03-25T00:54:44+00:00Z atmospheric gravity waves in ionospheric dynamics is also briefly addressed. We summarize analytical and numerical tools and techniques to model low frequency electromagnetic wave propagation and solving inverse problems and summarize in a final section a few challenging subjects that are important for a better understanding of tropospheric-ionospheric coupling mechanisms.

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“…Field aligned mapping of these electric fields to the polar ionosphere will produce more complex geomag- [1992] showed that the rise of the SC caused on the ground by the interaction between a plane HM wave and the Earth-ionosphere system is almost simultaneous at all local times in the equatorial plane. Although effectiveness of the zeroth-order waveguide mode is questioned by Pilipenko [1990], the observation above could be accepted as an evidence for the existence of a propagation mode much faster than the HM wave propagation. Main wave energy is carried by HM wave in and above the ionosphere but the forerunner or onset is able to propagate almost instantaneously.…”

Section: Dp Fieldmentioning

confidence: 99%

Anomalous sudden commencement on March 24, 1991

Araki¹,

Fujitani²,

Emoto³

et al. 1997

J. Geophys. Res.

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Abstract. An anomalous geomagnetic sudden commencement (SC) occurred on March 24, 1991. It is characterized by an exceptionally large and sharp impulse observed in its initial part along the noon meridian in middle and low latitudes. The analysis of the SC was made by using high time resolution digital data from the 210 ø Meridian Magnetometer Chain in the west Pacific, Sub-Auroral Magnetometer Network (SAMNET) in the United Kingdom and southern Scandinavia, the EISCAT Magnetometer Cross in northern Scandinavia and Svalbard, and Canopus in Canada together with other ground and satellite (GOES 6, GOES 7, CRRES, and GMS) data. The results of the analysis suggest that the pulse observed at lower-latitude ground stations was caused by the propagation of a strong magnetospheric compression of short duration (less than 1 min) which has never been observed before this event. The HF Doppler observation in Kyoto near local noon seems to be consistent with existence of the bipolar electric field associated with the propagating compressional magnetic pulse. The SAMNET stations and CRRES in the early morning also detected positive pulses which delays 30-50 s from the pulses in noon sector. Although the delay in the peak time of the pulse observed on the ground is consistent with ionospheric hydromagnetic wave propagation from the dayside to the nightside with finite speed, the initial onset time of the pulse on the ground was almost simultaneous everywhere suggesting the existence of an "almost instantaneous" propagation mode below the ionosphere. [1993] successfully simulated this event by particle acceleration due to a sharp compressional electromagnetic pulse launched from the magnetopause at 1500 LT in the very initial stage of the SC. The CRRES actually observed an 130 nT monopolar magnetic pulse and an associated bipolar electric pulse with a peak-topeak amplitude of 80 mV/m. The duration of the pulse is about 2 min. Such a large and sharp pulse has never been observed before in this region of the magnetosphere. The SC itself might be produced by a coronal mass ejection (CME) driven interplanetary shock which was presumably related with a 3B optical flare at 2246 UT on March 22, 1991.Since the analyses of this event have mostly been limited to particle data so far, it is necessary to study properties of the electromagnetic pulse observed by CRRES in more detail by analyzing other magnetic data. Although the CRRES observations and the simulation by Li et al. [1993] greatly contributed to understand this peculiar event, we have to recognize that the CRRES observations were made at one point in the magnetosphere. It is difficult therefore to discuss in detail about excitation and propagation of the observed pulse. Analyses of SCs made so far [see Araki, 1994] show that a simple compression of the magnetosphere causes a complex global distribution of amplitude and waveform of SC. The main positive H component increase of SCs is often preceded by a positive or negative impulse of short duration. This preceding impulse ...

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ULF waves on the ground and in space

Cited by 63 publications

References 51 publications

Theory of azimuthally small-scale hydromagnetic waves in the axisymmetric magnetosphere with finite plasma pressure

Theory of azimuthally small-scale hydromagnetic waves in the axisymmetric magnetosphere with finite plasma pressure

A Review of Low Frequency Electromagnetic Wave Phenomena Related to Tropospheric-Ionospheric Coupling Mechanisms

Anomalous sudden commencement on March 24, 1991

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