scholarly journals Research into connection between spectral resonance structures and harmonics of ionospheric Alfvén resonator

2018 ◽  
Vol 4 (3) ◽  
pp. 43-45
Author(s):  
К. Прикнер ◽  
K. Prikner ◽  
Феликс Фейгин ◽  
Feliks Feygin ◽  
Юрий Хабазин ◽  
...  
Keyword(s):  
Electromagnetic Waves ◽  
Signal Transmission ◽  
Dynamic Spectrum ◽  
Spectral Lines ◽  
Resonance Structures ◽  
Ionospheric Alfvén Resonator ◽  
Time Variations ◽  
Alfven Resonator ◽  
Eiscat Radar ◽  
Ionospheric Alfven Resonator

We present the results of modeling of the ionospheric Alfvén resonator (IAR) and compare the results of electromagnetic waves passing through IAR to Earth's surface with the dynamic spectrum of simultaneous observations of spectral resonance structures (SRS). IAR is simulated using ionospheric parameters obtained from measurements made with the CP-1 program of the Scandinavian EISCAT radar. The IAR model is employed to calculate coefficients of reflection RC(f) and transmission TC(f) of electromagnetic waves in the frequency range 0–5 Hz. The observed dynamic SRS spectrograms consist of spectral lines, in which frequencies, time variations of frequencies, and distances between adjacent resonant lines are confidently determined. The calculated frequencies of maxima of the signal transmission coefficient TC to Earth's surface correspond to the observed frequencies of the dynamic spectrum of SRS.

scholarly journals Research into connection between spectral resonance structures and harmonics of ionospheric Alfvén resonator

2018 ◽  
Vol 4 (3) ◽  
pp. 57-60
Author(s):  
К. Прикнер ◽  
K. Prikner ◽  
Феликс Фейгин ◽  
Feliks Feygin ◽  
Юрий Хабазин ◽  
...  
Keyword(s):  
Electromagnetic Waves ◽  
Signal Transmission ◽  
Dynamic Spectrum ◽  
Spectral Lines ◽  
Resonance Structures ◽  
Ionospheric Alfvén Resonator ◽  
Time Variations ◽  
Alfven Resonator ◽  
Eiscat Radar ◽  
Ionospheric Alfven Resonator

We present the results of modeling of the ionospheric Alfvén resonator (IAR) and compare the results of electromagnetic waves passing through IAR to Earth's surface with the dynamic spectrum of simultaneous observations of spectral resonance structures (SRS). IAR is simulated using ionospheric parameters obtained from measurements made with the CP-1 program of the Scandinavian EISCAT radar. The IAR model is employed to calculate coefficients of reflection RC(f) and transmission TC(f) of electromagnetic waves in the frequency range 0–5 Hz. The observed dynamic SRS spectrograms consist of spectral lines, in which frequencies, time variations of frequencies, and distanc-es between adjacent resonant lines are confidently de-termined. The calculated frequencies of maxima of the signal transmission coefficient TC to Earth's surface correspond to the observed frequencies of the dynamic spectrum of SRS.

scholarly journals An effect of the ionospheric Alfvén resonator on multiband Pc1 pulsations

2004 ◽  
Vol 22 (2) ◽  
pp. 643-651 ◽  
Author(s):  
K. Prikner ◽  
K. Mursula ◽  
J. Kangas ◽  
R. Kerttula ◽  
F. Z. Feygin
Keyword(s):  
Ionospheric Alfvén Resonator ◽  
High Latitude Ionosphere ◽  
Distinct Frequency ◽  
Radar Measurements ◽  
Pc1 Pulsations ◽  
Alfven Resonator ◽  
Eiscat Radar ◽  
Ionospheric Alfven Resonator ◽  
Ionospheric Resonator ◽  
Large Frequency

Abstract. On 2 December 1999, the magnetometer stations in northern Finland registered structured Pc1 activity simultaneously in three distinct frequency bands. Using simultaneous EISCAT radar measurements of the high-latitude ionosphere, we have studied the ionospheric resonator properties during this multiband Pc1 event. The frequencies of the three structured Pc1 bands were found to closely correspond to the second, third and fourth harmonic of the calculated fundamental frequency of the ionospheric Alfvén resonator (IAR). In addition, those frequencies of the three pearl bands that were closest to the exact IAR harmonics were found to have the strongest intensities. The results demonstrate that the resonator can have an important role on ground-based Pc1 activity over a notably large frequency range, favoring transmission of waves with frequencies close to the resonator's eigenfrequencies. Since the frequencies of all three bands correspond to the maximum rather than the minimum of the transmission coefficient, the traditional bouncing wave packet model needs to be revised. Key words. Ionosphere (auroral ionosphere; ionosphere magnetosphere interactions; wave propagation)

The splitting effect of the mode structure of the ionospheric alfven resonator

2015 ◽  
Vol 21 (1(92)) ◽  
pp. 58-63
Author(s):  
N.A. Baru ◽  
◽  
A.V. Koloskov ◽  
Y.M. Yampolski ◽  
◽  
...  
Keyword(s):  
Mode Structure ◽  
Ionospheric Alfvén Resonator ◽  
Alfven Resonator ◽  
Ionospheric Alfven Resonator ◽  
Splitting Effect

Pc 1 waves and ionospheric Alfvén resonator: Generation or filtration?

2000 ◽  
Vol 27 (23) ◽  
pp. 3805-3808 ◽  
Author(s):  
A. G. Demekhov ◽  
V. Yu. Trakhtengerts ◽  
T. Bösinger
Keyword(s):  
Ionospheric Alfvén Resonator ◽  
Alfven Resonator ◽  
Ionospheric Alfven Resonator

scholarly journals Ionospheric Alfvén resonator revisited: Feedback instability

2001 ◽  
Vol 106 (A11) ◽  
pp. 25813-25824 ◽  
Author(s):  
Oleg A. Pokhotelov ◽  
V. Khruschev ◽  
M. Parrot ◽  
S. Senchenkov ◽  
V. P. Pavlenko
Keyword(s):  
Ionospheric Alfvén Resonator ◽  
Alfven Resonator ◽  
Ionospheric Alfven Resonator

scholarly journals An automatic method to determine the frequency scale of the ionospheric Alfvén resonator using data from Hylaty station, Poland

2006 ◽  
Vol 24 (8) ◽  
pp. 2151-2158 ◽  
Author(s):  
A. Odzimek ◽  
A. Kułak ◽  
A. Michalec ◽  
J. Kubisz
Keyword(s):  
Field Data ◽  
Automatic Method ◽  
Frequency Range ◽  
Magnetic Field Data ◽  
Ionospheric Alfvén Resonator ◽  
Frequency Scale ◽  
Alfven Resonator ◽  
Using Data ◽  
Ionospheric Alfven Resonator ◽  
Elf Magnetic Field

Abstract. ULF/ELF magnetic field data recorded at the "Hylaty" station in Poland (49°19' N, 22°56' E; L≃2) are analysed to find the characteristics of spectral resonance structures (SRS) in the frequency range 1–5 Hz, related to the ionospheric Alfvén resonator (IAR). An automatic procedure is employed to SRS events observed at "Hylaty" during the nighttime in 2001–2003, to calculate the parameter which determines the separation between the harmonics of the resonator, termed the frequency scale. Diurnal and seasonal variations of the frequency scale within the range of 0.4–0.8 Hz have been found. The usefulness and disadvantages of this particular method of SRS analysis, and of other methods, are discussed.

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