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RAS PhysicsГеомагнетизм и аэрономия Geomagnetism and Aeronomy

  • ISSN (Print) 0016-7940
  • ISSN (Online) 3034-5022

Scenario for the formation of vortexlike structures in a presubstorm arc, taking into account changes in the arc height during its evolution

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PII
10.31857/S0016794024010087-1
DOI
10.31857/S0016794024010087
Publication type
Article
Status
Published
Authors
V. V. Safargaleev
  • Occupation: St. Petersburg Department
  • Affiliation:
    Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation, Russian Academy of Sciences
    Polar Geophysical Institute, Russian Academy of Sciences
T. I. Sergienko
  • Affiliation: Swedish Institute of Space Physics
A. L. Kotikov
  • Occupation: St. Petersburg Department
  • Affiliation:
    Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation, Russian Academy of Sciences
    Geophysical Center, Russian Academy of Sciences
A. V. Safargaleev
  • Affiliation: LSR Management Company
Volume/ Edition
Volume 64 / Issue number 1
Pages
74-92
Abstract
Activity in a prebreakup auroral arc in the form of vortexlike structures, the appearance/disappearance of which is preceded by an increase/decrease in the brightness of the arc, was studied in the context of a magnetospheric substorm, large-scale ionospheric convection, the situation in the interplanetary medium, and triangulation measurements of the arc height. The structures are observed in the premidnight hours and represent a superposition of two auroral forms: a large-scale bend in the arc that outlines the polar boundary of the diffuse auroras and smaller luminous tongues of luminosity (mini-torches) elongated along the convection on the western slope of the bends. The structures as a whole move against convection, towards substorm activity to the east of the observation area. We attribute the appearance of structures to the propagation of a disturbance deep into the magnetosphere, generated as a result of interaction of the magnetopause with a solar wind inhomogeneity, on the front of which Bz turns southward. The results of triangulation measurements show that the increase in brightness in the prebreakup arc shortly before the appearance of vortexlike structures is accompanied by a decrease in the height of the lower edge of the arc, which we explain by the appearance of a parallel electric field above the arc, which accelerates the precipitating electrons. The role of such a field in the formation of the torchlike structures is discussed in the framework of the interchange instability of the pole boundary of diffuse auroras.
Keywords
авроральные вихри солнечный ветер предсуббуревая дуга
Date of publication
01.01.2024
Year of publication
2024
Number of purchasers
0
Views
56

References

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