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- Title
Spatial Structure of the Illuminated Area of the Auroral Hiss Based on Ground-Based Observations at Auroral Latitudes.
- Authors
Nikitenko, A. S.; Manninen, J.; Fedorenko, Yu. V.; Kleimenova, N. G.; Kuznetsova, M. V.; Larchenko, A. V.; Beketova, E. B.; Pilgaev, S. V.
- Abstract
The article presents the results of ground-based observations of very low-frequency (VLF) auroral hiss bursts at the Lovozero (Russia) and Kannuslehto (Finland) observatories, which are located at close geomagnetic latitudes and spaced ~400 km apart in longitude. We analyzed 22 events recorded from 7 November 2018, to 9 February 2020. Four types of spatial structure of the auroral hiss illuminated area were identified: (1) the illuminated area has dimensions that are small relative to the distance between stations; (2) the illuminated area is elongated; (3) the illuminated area shifts along the longitude; and (4) the mixed type. The distinctive features of temporal variations of the horizontal component of the magnetic field, the index of circular polarization, the ratio of the vertical component of the electric field to the horizontal component of the magnetic field, and the distribution of the energy flux density over the angles of arrival at 8 kHz were formulated for each type. We assume that the size and position of the VLF illuminated area of the auroral hiss can be an indicator of the position and transverse dimensions of the region occupied by small-scale, electron-density inhomogeneities in the upper ionosphere.
- Subjects
CIRCULAR polarization; ACTINIC flux; MAGNETIC fields; ENERGY density; ELECTRIC fields
- Publication
Geomagnetism & Aeronomy, 2022, Vol 62, Issue 3, p209
- ISSN
0016-7932
- Publication type
Article
- DOI
10.1134/S0016793222030124