TY - JOUR
T1 - Influence of solar terminator passages on Schumann resonance parameters
AU - Melnikov, A.
AU - Price, C.
AU - Sátori, G.
AU - Füllekrug, M.
N1 - Funding Information:
Part of this research was funded by the Israel Science Foundations Grant # 183/00. Construction and operation of the Israeli station was made possible by the help of Mr. Boris Starobinets and Dr. Michael Finkelstein. We also thank the Wise Astronomical Observatory for access to their site for the SR measurements in Israel. The Hungary's contribution to this research was supported by the Grant TS 40848 (T034309) of the Hungarian Science Foundation.
PY - 2004/9
Y1 - 2004/9
N2 - The Terminator Effect (TE) on extremely low frequency (ELF) electromagnetic waves or Schumann Resonances (SR) was investigated on the basis of observations during a number of years at different mid-latitude stations [Hollister (36.8° N, 121.5° W, SAO, USA), Mitzpe Ramon (30.5° N, 34.4° E, MR, Israel) and Nagycenk (47.6 N, 16.7 E, NC, Hungary)]. Definite shifts are observed in the SR magnetic and electric field characteristics during local sunrise and sunset. The terminator passage influences all magnetic field components at SAO, with more significant effects in the east-west component. At MR and NC stations notable effects were observed only in the vertical electric field. The TE is more pronounced in higher SR modes (14, 20 Hz) compared with the 8 Hz mode. Furthermore, the TE is more pronounced in the morning than evening, and more pronounced in winter than in summer. All these observations indicate that, in addition to diurnal-seasonal thunderstorm source motions, lateral ionospheric gradients across the terminator region have significant influences on ELF wave propagation.
AB - The Terminator Effect (TE) on extremely low frequency (ELF) electromagnetic waves or Schumann Resonances (SR) was investigated on the basis of observations during a number of years at different mid-latitude stations [Hollister (36.8° N, 121.5° W, SAO, USA), Mitzpe Ramon (30.5° N, 34.4° E, MR, Israel) and Nagycenk (47.6 N, 16.7 E, NC, Hungary)]. Definite shifts are observed in the SR magnetic and electric field characteristics during local sunrise and sunset. The terminator passage influences all magnetic field components at SAO, with more significant effects in the east-west component. At MR and NC stations notable effects were observed only in the vertical electric field. The TE is more pronounced in higher SR modes (14, 20 Hz) compared with the 8 Hz mode. Furthermore, the TE is more pronounced in the morning than evening, and more pronounced in winter than in summer. All these observations indicate that, in addition to diurnal-seasonal thunderstorm source motions, lateral ionospheric gradients across the terminator region have significant influences on ELF wave propagation.
KW - ELF
KW - Schumann resonance
KW - Solar terminator
UR - http://www.scopus.com/inward/record.url?scp=3543101398&partnerID=8YFLogxK
U2 - 10.1016/j.jastp.2004.05.014
DO - 10.1016/j.jastp.2004.05.014
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AN - SCOPUS:3543101398
SN - 1364-6826
VL - 66
SP - 1187
EP - 1194
JO - Journal of Atmospheric and Solar-Terrestrial Physics
JF - Journal of Atmospheric and Solar-Terrestrial Physics
IS - 13-14 SPEC. ISS.
ER -