Large-scale relationships of the geomagnetic indices SYM-H and ASY-H with the north-south IMF component and the solar wind beta parameter

Georgy Makarov

doi:10.12737/szf-103202411

UDC 52 UDC 55

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LARGE-SCALE RELATIONSHIPS OF THE GEOMAGNETIC INDICES SYM-H AND ASY-H WITH THE NORTH-SOUTH IMF COMPONENT AND THE SOLAR WIND BETA PARAMETER Large-scale relationships of the geomagnetic indices SYM-H and ASY-H with the north-south IMF component and the solar wind beta parameter

АА Аа

Published in Solnechno-Zemnaya Fizika · Volume 10, Issue 3 · Pages 97–103 · Rubric: 19TH ANNUAL CONFERENCE “PLASMA PHYSICS IN THE SOLAR SYSTEM”. FEBRUARY 5–9, 2024, SPACE RESEARCH INSTITUTE RAS, MOSCOW, RUSSIA

DOI: https://doi.org/10.12737/szf-103202411

Received: 05.03.2024 Accepted: 08.04.2024 Published: 29.09.2024

Authors

Georgy Makarov

Academic degree: candidate of physical and mathematical sciences

Yu.G. Shafer Institute of Cosmophysical Research and Aeronomy SB RAS Russian Federation · Yakutsk

ABSTRACT

Using annual average values, the relationships are examined of the geomagnetic indices SYM-H, ASY-H, and Dst with solar wind parameters in 1981–2015. The data used was divided into two samples according to the sign of the north-south component Bn of the interplanetary magnetic field (IMF). Variations in the annual average values of each of the Dst, SYM-H, and ASY-H indices for southward and northward IMF have been found to be similar and their linear correlation coefficients r to be high: 0.871, 0.863, and 0.943 respectively. The similarity between variations of the indices with different signs of Bn is probably due to their connection with the number of sunspots. It has been established that Dst, SYM-H, and ASY-H depend on the solar wind parameter β: their absolute values decrease with increasing β, regardless of Bn sign. The decrease in the indices with increasing β is likely to be caused by the transition of the magnetosphere to a quiet state due to the increasing predominance of thermal pressure over magnetic one in the solar wind and a decrease in the level of solar wind turbulence. SYM-H and ASY-H have been found to reveal the closest relationships with β, whereas SYM-H more strongly depends on β for southward IMF (r=0.744) than for northward IMF (r=0.677). On the contrary, for ASY-H r=–0.741 at northward IMF and r=–0.719 at southward IMF. Similar to SYM-H, Dst (to a lesser extent) significantly correlates with β at southward IMF (r=0.629) and weaker at northward IMF (r=0.456).

KEYWORDS

geomagnetic indices Dst, SYM-H, and ASY-H, geomagnetic activity, magnetospheric ring current, interplanetary parameters

Funding

The work was carried out under Government assignment (State Registration Number 122011700182-1)

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Editor-in-Chief

Geliy Zherebtsov

solater@iszf.irk.ru

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Deputy Editor-in-Chief

Alexander Potapov

potapov@iszf.irk.ru

Executive Secretary of Editorial Board

Natalia Polyushkina

npol@iszf.irk.ru

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GOST

Makarov G. A. Large-scale relationships of the geomagnetic indices SYM-H and ASY-H with the north-south IMF component and the solar wind beta parameter // Solnechno-Zemnaya Fizika. 2024. no. 3. pp. 97-103. DOI: https://doi.org/10.12737/szf-103202411. (Date of access 20.10.2026).

MLA

Georgy Makarov. "Large-scale relationships of the geomagnetic indices SYM-H and ASY-H with the north-south IMF component and the solar wind beta parameter." Solnechno-Zemnaya Fizika 10.3 (2024): 97-103. DOI: https://doi.org/10.12737/szf-103202411.

APA

Makarov G. A. (2024). Large-scale relationships of the geomagnetic indices SYM-H and ASY-H with the north-south IMF component and the solar wind beta parameter. Solnechno-Zemnaya Fizika, 10(3), 97-103. https://doi.org/10.12737/szf-103202411

Chicago

Georgy Makarov. "Large-scale relationships of the geomagnetic indices SYM-H and ASY-H with the north-south IMF component and the solar wind beta parameter." Solnechno-Zemnaya Fizika 10, no. 3 (2024): 97-103. https://doi.org/10.12737/szf-103202411.

WIKI

{{cite journal | author = Makarov G. A. | title = Large-scale relationships of the geomagnetic indices SYM-H and ASY-H with the north-south IMF component and the solar wind beta parameter | journal = Solnechno-Zemnaya Fizika | year = 2024 | volume = 10 | issue = 3 | pages = 97-103 | doi = 10.12737/szf-103202411 }}

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LARGE-SCALE RELATIONSHIPS OF THE GEOMAGNETIC INDICES SYM-H AND ASY-H WITH THE NORTH-SOUTH IMF COMPONENT AND THE SOLAR WIND BETA PARAMETER Large-scale relationships of the geomagnetic indices SYM-H and ASY-H with the north-south IMF component and the solar wind beta parameter

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