Measurements of magnetic fields in solar corona as based on the radio observations of the inversion of polarization of local sources at microwaves

Gelfreikh, G. B.; Peterova, N. G.; Ryabov, B. I.

doi:10.1007/bf00152079

Cited by 41 publications

(16 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The RATAN observations also demonstrated the change of the sign of polarization both with wavelength and time (Gelfreikh et al, 1987). This is due to propagation through a region of quasi-transverse magnetic field and may be used succesfully for measurements of magnetic fields in the corona at the heights up to 120,000 km.…”

Section: Inversion Of Polarization In Qt-regionmentioning

confidence: 79%

Diagnostics of the Solar Plasma Using Radio Observations with the RATAN-600

Gelfreikh

1990

Symp. - Int. Astron. Union

View full text Add to dashboard Cite

ABSTRACT.This paper summarises the methods and main results of studying physical parameters and processes in different structures of the solar atmosphere from the chromosphere to the outer corona as based on the observations with a 600-meter radio telescope the RATAN-600 (1975RATAN-600 ( -1989. Diagnostics of the solar plasma have been made using the spectral-polarization measurements in the wavelength range 0.8-32 cm with high spatial resolution. The most important results concern the structure and strength of the magnetic fields at different levels of the solar atmosphere and detection of localized regions of long-lasting (several days) energy release in the lower corona. INTRODUCTIONSolar observations using the world's largest radio telescopes (VLA, WSRT, RATAN-600 et al. ) have shown during the Solar Maximum Year program that the radio observations yield valuable information about the magnetic fields and particle acceleration in the solar corona. Such diagnostics depend on detailed spectral analysis and accurate polarization measurements with high spatial and temporal resolution. 483-488. SCIENTIFIC PROBLEMS

show abstract

Section: Inversion Of Polarization In Qt-regionmentioning

confidence: 79%

Diagnostics of the Solar Plasma Using Radio Observations with the RATAN-600

Gelfreikh

1990

Symp. - Int. Astron. Union

View full text Add to dashboard Cite

show abstract

“…The measurement of circular polarization emission in a wide wavelength range using developed analysis methods (Gelfreikh et al 1987;Gelfreikh 1972;Akhmedov et al 1982;Bogod k Gelfreikh 1980) allows investigation of the magnetic atmospheres of active regions.…”

Section: Software For Observational Reductionmentioning

confidence: 99%

Panoramic Analyzer of Radio Spectra — Instrument for Measurements of Coronal Magnetic Fields on the Sun

Bogod

Vatrushin

Abramov-Maximov

et al. 1993

International Astronomical Union Colloquium

View full text Add to dashboard Cite

The study of solar radio emission in a wide (covering many octaves) wavelength range is of great importance for plasma diagnostics of all types of solar activity. Here we describe a new spectroanalyzer covering a wide range in frequency from 1 to 18 GHz, which is used at the RATAN-600 radio telescope beginning 1991 December 20. Coronal magnetic fields have been measured with the various radio astronomical methods presented in these proceedings by Gelfreikh et al. and Bogod et al.Of special value are collaborative spectral-polarization observations using the RATAN-600 and high-spatial resolution observations with the VLA and WSRT (Akhmedov et al. 1986; Bogod et al. 1992; Alissandrakis et al. 1992).

show abstract

“…They do not provide a crucial test for the reality of multiple inversion. The POLAR2 model (see Gelfreikh et al 1987 for details) is used and it only roughly simulates the flocculi magnetic fields by magnetic dipoles. It does leading sunspot (Hph = 2400 G) of AR 145 SD (Fig.l), was registered on May 9, 1992, the day of the central solar meridian passage.…”

Section: Introductionmentioning

confidence: 99%

“…To simulate the microwave QT-propagation, a POLAR2 model of Gelfreikh et al (1987) is used. The model allows to calculate the generation of microwaves in the potential structure of the AR coronal field by the gyroresonance and the bremsstrahlung mechanisms and the quasi-transverse propagation.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of the Multiple Inversion of Circular Polarization in Solar Microwave Local Sources

Ryabov¹

1997

Open Astronomy

Self Cite

View full text Add to dashboard Cite

Abstract. The multiple inversion of the sign of circular polarization in the microwave local source of an active region is interpreted as a result of the quasi-transverse propagation of microwaves. For further analysis of the inversion, mathematical restrictions on the degree of circular polarization are drawn using the wave mode coupling theory. The polarization depression at wavelengths, adjacent to the wavelength of zero circular polarization, is estimated for three active regions. Also, the dependence of multiple inversion on wavelength as a result of multiple crossing of the coronal QT-regions is verified. We suggest a hierarchy of coronal arches of active regions as a structure responsible for the multiple inversion of circular polarization of microwaves.

show abstract

Measurements of magnetic fields in solar corona as based on the radio observations of the inversion of polarization of local sources at microwaves

Cited by 41 publications

References 7 publications

Diagnostics of the Solar Plasma Using Radio Observations with the RATAN-600

Diagnostics of the Solar Plasma Using Radio Observations with the RATAN-600

Panoramic Analyzer of Radio Spectra — Instrument for Measurements of Coronal Magnetic Fields on the Sun

Analysis of the Multiple Inversion of Circular Polarization in Solar Microwave Local Sources

Contact Info

Product

Resources

About