On the zebra structure in microwave bursts

L. V. Yasnov, G. P. Chernov, Y. Yan, Q. Fu

Research output

4 Citations (Scopus)

Abstract

We presented nineteen cases of zebra pattern structure (ZPS) and fiber bursts (FB) in four radio bursts at the frequency range about 3 GHz, using the new microwave spectrometer of NAOC between 2.6-3.8 GHz (China, Huairou station) with high resolution (10 MHz and 8 ms). FB and ZPS have about the same spectral parameters, and the main one - the frequency separation between the emission and the neighbouring low frequency absorption ∼30 MHz. Therefore we consider both fine structures as whistler manifestation. New calculations show an increase of the whistler growth rate with the increase of temperature near flare region, a decrease of electron cyclotron damping and a decrease of whistler frequency up to 0,1 of electron cyclotron frequency. The duration of fiber bursts about 2 sec corresponds to the whistler waves propagating undamped at about 2 sec, which requires the whistler increment <0,5 1/s. This finding is used to obtain the magnetic field strength in the generation region. For reasonable value of electron temperature (2-20 MK) B=125-190 G for regions, where the electron density is (8-18) × 1010 cm-3.

Original languageEnglish
Pages (from-to)791-794
Number of pages4
JournalEuropean Space Agency, (Special Publication) ESA SP
Issue number506 II
Publication statusPublished - 1 Dec 2002
EventThe 10th European Solar Physics Meeting; Solar Variability: From Core to Outer Frontiers - Prague
Duration: 9 Sep 200214 Sep 2002

Fingerprint

bursts
Microwaves
Cyclotrons
microwaves
electron
fibers
Fibers
Microwave spectrometers
microwave spectrometers
radio bursts
Electrons
Electron temperature
cyclotron frequency
electron density
flares
damping
Carrier concentration
cyclotrons
China
field strength

Scopus subject areas

  • Aerospace Engineering
  • Space and Planetary Science

Cite this

Yasnov, L. V. ; Chernov, G. P. ; Yan, Y. ; Fu, Q. / On the zebra structure in microwave bursts. In: European Space Agency, (Special Publication) ESA SP. 2002 ; No. 506 II. pp. 791-794.
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abstract = "We presented nineteen cases of zebra pattern structure (ZPS) and fiber bursts (FB) in four radio bursts at the frequency range about 3 GHz, using the new microwave spectrometer of NAOC between 2.6-3.8 GHz (China, Huairou station) with high resolution (10 MHz and 8 ms). FB and ZPS have about the same spectral parameters, and the main one - the frequency separation between the emission and the neighbouring low frequency absorption ∼30 MHz. Therefore we consider both fine structures as whistler manifestation. New calculations show an increase of the whistler growth rate with the increase of temperature near flare region, a decrease of electron cyclotron damping and a decrease of whistler frequency up to 0,1 of electron cyclotron frequency. The duration of fiber bursts about 2 sec corresponds to the whistler waves propagating undamped at about 2 sec, which requires the whistler increment <0,5 1/s. This finding is used to obtain the magnetic field strength in the generation region. For reasonable value of electron temperature (2-20 MK) B=125-190 G for regions, where the electron density is (8-18) × 1010 cm-3.",
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On the zebra structure in microwave bursts. / Yasnov, L. V.; Chernov, G. P.; Yan, Y.; Fu, Q.

In: European Space Agency, (Special Publication) ESA SP, No. 506 II, 01.12.2002, p. 791-794.

Research output

TY - JOUR

T1 - On the zebra structure in microwave bursts

AU - Yasnov, L. V.

AU - Chernov, G. P.

AU - Yan, Y.

AU - Fu, Q.

PY - 2002/12/1

Y1 - 2002/12/1

N2 - We presented nineteen cases of zebra pattern structure (ZPS) and fiber bursts (FB) in four radio bursts at the frequency range about 3 GHz, using the new microwave spectrometer of NAOC between 2.6-3.8 GHz (China, Huairou station) with high resolution (10 MHz and 8 ms). FB and ZPS have about the same spectral parameters, and the main one - the frequency separation between the emission and the neighbouring low frequency absorption ∼30 MHz. Therefore we consider both fine structures as whistler manifestation. New calculations show an increase of the whistler growth rate with the increase of temperature near flare region, a decrease of electron cyclotron damping and a decrease of whistler frequency up to 0,1 of electron cyclotron frequency. The duration of fiber bursts about 2 sec corresponds to the whistler waves propagating undamped at about 2 sec, which requires the whistler increment <0,5 1/s. This finding is used to obtain the magnetic field strength in the generation region. For reasonable value of electron temperature (2-20 MK) B=125-190 G for regions, where the electron density is (8-18) × 1010 cm-3.

AB - We presented nineteen cases of zebra pattern structure (ZPS) and fiber bursts (FB) in four radio bursts at the frequency range about 3 GHz, using the new microwave spectrometer of NAOC between 2.6-3.8 GHz (China, Huairou station) with high resolution (10 MHz and 8 ms). FB and ZPS have about the same spectral parameters, and the main one - the frequency separation between the emission and the neighbouring low frequency absorption ∼30 MHz. Therefore we consider both fine structures as whistler manifestation. New calculations show an increase of the whistler growth rate with the increase of temperature near flare region, a decrease of electron cyclotron damping and a decrease of whistler frequency up to 0,1 of electron cyclotron frequency. The duration of fiber bursts about 2 sec corresponds to the whistler waves propagating undamped at about 2 sec, which requires the whistler increment <0,5 1/s. This finding is used to obtain the magnetic field strength in the generation region. For reasonable value of electron temperature (2-20 MK) B=125-190 G for regions, where the electron density is (8-18) × 1010 cm-3.

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M3 - Conference article

AN - SCOPUS:0036977984

SP - 791

EP - 794

JO - European Space Agency, (Special Publication) ESA SP

JF - European Space Agency, (Special Publication) ESA SP

SN - 0379-6566

IS - 506 II

ER -