Harmonic resonance structure and chaotic dynamics in the earth-vibrator system1

1995 ◽  
Vol 43 (4) ◽  
pp. 487-507 ◽  
Author(s):  
David Walker
1997 ◽  
Vol 40 (5) ◽  
Author(s):  
A. Cook

The physics of the Earth and the planets itself limits the knowledge that can be obtained of it. Two principle limitations are set in inverse problems and by chaotic dynamics; examples of each are given in this essay and some implications are discussed.


2006 ◽  
Vol 2 (S236) ◽  
pp. xvii-xx ◽  
Author(s):  
Giovanni B. Valsecchi

AbstractSome of the problems related to Near Earth Objects (NEOs), like orbit determination and ephemeris computation, are not new, and had to be dealt with since the beginning of NEO astronomy. The latter practically started with the discovery of Comet D/1770 L1 Lexell, that passed very close to the Earth in 1770; studies of the chaotic dynamics of this exceptional object continued well into the XIXth century. At the end of the XXth century there has been a renewal of interest in NEOs, as attested by IAU Symposium 236.


2016 ◽  
Vol 6 (1) ◽  
pp. 45-49 ◽  
Author(s):  
N. Baru ◽  
A. Koloskov ◽  
Y. Yampolsky ◽  
R. Rakhmatulin

Among the processes that form properties of the geospace in the circumterrestrial plasma the electromagnetic resonances of the Earth, such as Schummann Resonance (SR) and Ionospheric Alfvén Resonance (IAR) are of great importance. IAR is more localized in space than SR and its properties largely depend on the characteristics of the propagation medium. In contrast to the SR, which has global nature and which is continuously observable at any time of the day, IAR signals are registered mostly during the nighttime and demonstrate more variability of the parameters than SR signals. At the Earth surface IAR is registered as Spectral Resonance Structure of the natural electromagnetic noise at frequency range 0.1-40 Hz. In this work we studied an influence of the environment characteristics on IAR parameters by the means of multipoint observations. Annual data series recorded at Ukrainian Antarctic Station 'Akademik Vernadsky', Low Frequency Observatory of the Institute of Radio Astronomy near Kharkov (Ukraine) and magnetic station of Sayan Solar Observatory Mondy near Irkutsk (Russia) were used for the analysis. We investigated the behaviour of IAR parameters, such as probability of resonance lines registration and frequency spacing $\Delta F$, for annual and diurnal intervals. These parameters were compared with characteristics of the ionosphere above all of the observation points and geomagnetic activity.


2018 ◽  
Vol 4 (3) ◽  
pp. 68-83
Author(s):  
Владимир Пархомов ◽  
Vladimir Parhomov ◽  
Наталия Бородкова ◽  
Natalia Borodkova ◽  
Александр Яхнин ◽  
...  

Using the June 22, 2015 event as an example, we present new data confirming the presence of a precursor of the sudden magnetic impulse caused by a powerful interplanetary shock wave (ISW). The precursor in the form of a train of oscillations (broadband pulse) with a falling frequency in the range 0.25÷11 Hz with a duration of ~20 s, which had a spectral resonance structure, was recorded globally by a network of induc-tion magnetometers at 18:33:27 UT. No significant phase delays of the signals were detected in four fre-quency bands at widely spaced observatories. It is sug-gested that the impulse can be excited in the Earth — ionosphere waveguide by a pulsed electric field which occurs in the ionosphere due to the short-term impact of ISW on the magnetosphere.


2018 ◽  
Vol 4 (3) ◽  
pp. 52-66
Author(s):  
Владимир Пархомов ◽  
Vladimir Parhomov ◽  
Наталия Бородкова ◽  
Natalia Borodkova ◽  
Александр Яхнин ◽  
...  

Using the June 22, 2015 event as an example, we present new data confirming the presence of a precursor of the sudden magnetic impulse caused by a powerful interplanetary shock wave (ISW). The precursor in the form of a train of oscillations (broadband pulse) with a falling frequency in the range 0.25÷11 Hz with a duration of ~20 s, which had a spectral resonance structure, was recorded globally by a network of induction magnetometers at 18:33:27 UT. No significant phase delays of the signals were detected in four frequency bands at widely spaced observatories. It is suggested that the impulse can be excited in the Earth – ionosphere waveguide by a pulsed electric field which occurs in the ionosphere due to the short-term impact of ISW on the magnetosphere.


Author(s):  
G. P. Pavlos ◽  
A. G. Rigas ◽  
D. Dialetis ◽  
E. T. Sarris ◽  
L. P. Karakatsanis ◽  
...  

2016 ◽  
Vol 8 (3) ◽  
pp. 56
Author(s):  
Fatma Taher

<p>Fictional texts still remain a forceful medium in understanding the turbulent global culture at the end of the millennium. The language of literature is greatly affected by the struggle between two mutually opposed forces: the oppressor and the resisting power of the oppressed. The oppressed and the exploited of the earth maintain their defiance: liberty, through resistance. The biggest weapon against this defiance is to annihilate their belief in their past, roots, culture, or even their names and ultimately in themselves. It makes them want to identify with that which is remote; for example other people’s language. Ideas are implanted that any possibility of success or triumph is a remote ridiculous dream. This in turn creates a collective despair and a wasteland where the oppressor presents himself as the cure.</p><p>Remembering, looking back in anger or even imagining are all acts of resistance and of lending coherence and integrity to a history and a homeland interrupted, divided or compromised by instances of loss. Redressing forcibly forgotten experiences, allows the silences of history to come into word, and makes us imagine alternative scripts of the past, hence invariably changes our understanding of the present.</p><p>The present paper aims at investigating narratives that recuperate losses incurred in migration, exile and dislocation. Forced or voluntary immigration is discussed as part and parcel in the narratives that originate at border crossings and that cannot be bound by national borders, languages or traditions through Naipaul’s <em>The Middle Passage</em>, and Munif’s <em>Cities of Salt</em>, where the chaotic dynamics of a world constantly on the move creates resistance and possibly confrontations, mirroring the fragmented consciousness of postmodern culture elucidated by HomiBhabha and Frantz Fanon.</p>


1966 ◽  
Vol 25 ◽  
pp. 373
Author(s):  
Y. Kozai

The motion of an artificial satellite around the Moon is much more complicated than that around the Earth, since the shape of the Moon is a triaxial ellipsoid and the effect of the Earth on the motion is very important even for a very close satellite.The differential equations of motion of the satellite are written in canonical form of three degrees of freedom with time depending Hamiltonian. By eliminating short-periodic terms depending on the mean longitude of the satellite and by assuming that the Earth is moving on the lunar equator, however, the equations are reduced to those of two degrees of freedom with an energy integral.Since the mean motion of the Earth around the Moon is more rapid than the secular motion of the argument of pericentre of the satellite by a factor of one order, the terms depending on the longitude of the Earth can be eliminated, and the degree of freedom is reduced to one.Then the motion can be discussed by drawing equi-energy curves in two-dimensional space. According to these figures satellites with high inclination have large possibilities of falling down to the lunar surface even if the initial eccentricities are very small.The principal properties of the motion are not changed even if plausible values ofJ3andJ4of the Moon are included.This paper has been published in Publ. astr. Soc.Japan15, 301, 1963.


1962 ◽  
Vol 14 ◽  
pp. 415-418
Author(s):  
K. P. Stanyukovich ◽  
V. A. Bronshten

The phenomena accompanying the impact of large meteorites on the surface of the Moon or of the Earth can be examined on the basis of the theory of explosive phenomena if we assume that, instead of an exploding meteorite moving inside the rock, we have an explosive charge (equivalent in energy), situated at a certain distance under the surface.


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