First Results of Simultaneous Recording of VLF Emissions
at Two Closely Located Points at Auroral Latitudes

J. Manninen^a, Yu. V. Fedorenko^b, N. G. Kleimenova^{c, d}, O. V. Kozyreva^{c, d}, and A. S. Nikitenko^b

^a Sodankyla Geophysical Observatory, Finland

^b Polar Geophysical Institute, Russian Academy of Sciences, Apatity, Murmansk region, Russia

^c Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia

^d Institute of Space Research, Russian Academy of Sciences, Moscow, Russia

e-mail: jyrki.manninen@sgo.fi

Received July 2, 2013

Abstract—For the first time, simultaneous observations of very low frequency (VLF) emissions at auroral lat-
itudes (L = 5.3) are carried out at two points located at close geomagnetic latitudes and spaced in longitude by
400 km: the Finnish Kannuslehto station ( = 64.2) and the Russian Lovozero observatory ( = 64.1). A
recording equipment with similar frequency responses was used. The first results of a comparison of simulta-
neous observations showed that, in the overwhelming majority of cases, bursts of VLF emission appeared at
both points synchronously with an identical (more often right-handed) polarization of the magnetic field of VLF
waves, which can be evidence in favor of large dimensions of the ionosphere exit region of VLF waves. A simul-
taneous burst of quasi-periodic VLF emissions that occurred on February 02, 2013, during a substorm at 23–24
UT is discussed in detail. Additionally, VLF bursts were recorded which were observed only at one point, e.g.,
the appearance of left-hand polarized periodic emissions (PEs) in band 2.5–4.0 kHz with a repetition period of
3–4 s.

10.1134/S0016793214010083

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