Longitudinal magnetic field gradients and vertical electric currents in active regions with different flare productivity levels

Fursyak Yu.

doi:doi:10.26119/VAK2024.102

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Longitudinal magnetic field gradients and vertical electric currents in active regions with different flare productivity levels

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LONGITUDINAL MAGNETIC FIELD GRADIENTS AND VERTICAL ELECTRIC CURRENTS IN ACTIVE REGIONS WITH DIFFERENT FLARE PRODUCTIVITY LEVELS

Section: THE SUN AND SOLAR SYSTEM, SPACE WEATHER

Proceedings: MODERN ASTRONOMY: FROM THE EARLY UNIVERSE TO EXOPLANETS AND BLACK HOLES Volume 1

UDC 52 UDC 53 UDC 520 UDC 521 UDC 523 UDC 524 UDC 52-1 UDC 52-6

CSCSTI 41.00 CSCSTI 29.35 CSCSTI 29.31 CSCSTI 29.33 CSCSTI 29.27 CSCSTI 29.05

Russian Classification of Professions by Education 03.06.01 Russian Classification of Professions by Education 03.05.01 Russian Classification of Professions by Education 03.04.03

Russian Library and Bibliographic Classification 2 Russian Library and Bibliographic Classification 223

Russian Trade and Bibliographic Classification 614 Russian Trade and Bibliographic Classification 6135

BISAC SCI004000 Astronomy BISAC SCI005000 Physics / Astrophysics

Fursyak Yu. ¹

Author and publication information

Authors:

1. Crimean Astrophysical Observatory of the Russian Academy of Sciences

Type:

Сonference article

DOI:

https://doi.org/10.26119/VAK2024.102

EDN:

https://elibrary.ru/bjddbu

Published:

27.12.2024

Subject area:

UDC 52
UDC 53
UDC 520
UDC 521
UDC 523
UDC 524
UDC 52-1
UDC 52-6
CSCSTI 41.00
CSCSTI 29.35
CSCSTI 29.31
CSCSTI 29.33
CSCSTI 29.27
CSCSTI 29.05
Russian Classification of Professions by Education 03.06.01
Russian Classification of Professions by Education 03.05.01
Russian Classification of Professions by Education 03.04.03
Russian Library and Bibliographic Classification 2
Russian Library and Bibliographic Classification 223
Russian Trade and Bibliographic Classification 614
Russian Trade and Bibliographic Classification 6135
BISAC SCI004000 Astronomy
BISAC SCI005000 Physics / Astrophysics

Language:

English

Keywords:

Sun: activity, flares, magnetic fields, electric currents

Abstract and keywords

Abstract (English):
The purpose of the work performed was to search for parameters of longitudinal magnetic field gradients and vertical electric currents, and their values, which could serve as the basis for creating criteria for short-term forecasting of changes in the flare productivity of an active region (AR). In the course of the study, a threshold (critical) value of the average unsigned vertical electric current density (

< | j_{z} | >

) was identified, equal to 2.7 mA m

^{- 2}

; it is shown that in all ARs with high flare activity, the value of

< | j_{z} | >

is above the threshold; it is shown that a rapid increase in the parameter

< | j_{z} | >

above the critical value, especially in ARs, in which additional ascent of the magnetic flux was recorded during their monitoring time, indicates an increase in AR flare activity in the time interval of 18-20 hours. A threshold value of the transverse component of the longitudinal magnetic field gradient between pairs of sunspots in the AR (

m a x (\nabla_{⊥} B_{z})_{s p}

), equal to 0.118 G km

^{- 1}

, was also found. In the AR NOAA 11283, a study of the dynamics of the value made it possible to detect a time delay of 19 hours between the beginning of its stable growth and the time of the beginning of the development of the first of a series of powerful solar flares.

Keywords:
Sun: activity, flares, magnetic fields, electric currents

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References

1. Abramenko V.I., 2005, Astrophysical Journal, 629, 2, p. 1141

2. Altyntsev A.T., Banin V.G., Kuklin G.V., et al., 1982, Solar flares, Moscow, Science Press

3. Fursyak Yu.A, 2023, Astrophysics, 66, 4, p. 532

4. Fursyak Yu.A., 2018, Geomagnetism and Aeronomy, 58, 8, p. 1129

5. Fursyak Yu.A., 2024, Astrophysics, 67, 1, p. 67

6. Scherrer P.H., Schou J., Bush R.I., et al., 2012, Solar Physics, 275, 1-2, p. 207

7. Severny A.B., Stepanyan N.N., Steshenko N.V., 1979, in: NOAA Solar-Terrestial Predictions Proceedings, 1, p. 72

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