TY - JOUR
T1 - Near-equatorial Pi2 and Pc3 waves observed by CHAMP and on SAMBA/MAGDAS stations
AU - Cuturrufo, F.
AU - Pilipenko, V.
AU - Heilig, B.
AU - Stepanova, M.
AU - Lühr, H.
AU - Vega, P.
AU - Yoshikawa, A.
N1 - Funding Information:
The useful discussions with E. Fedorov and N. Yagova are appreciated. This study is partly supported by the Grant No. 13-05-90436 from RFBR (VP). We acknowledge the SAMBA data provided by E. Zesta, and data from ANC station provided by T. Uozumi and J. Ishitsuka. We appreciate valuable comments of both Reviewers.
Publisher Copyright:
© 2014 COSPAR. Published by Elsevier Ltd. All rights reserved.
PY - 2015/2/15
Y1 - 2015/2/15
N2 - We have examined simultaneous ULF activity in the Pi2 and Pc3 bands at the near-equatorial magnetic stations in South America from SAMBA and MAGDAS arrays and low-orbiting CHAMP satellite during its passage over this meridional network. At the nighttime, both Pi2 and Pc3 waves in the upper ionosphere and on the ground are nearly of the same magnitude and in-phase. At the same time, the daytime Pc3 pulsations on the ground and in space are nearly out-of-phase. Comparison of observational results with the theoretical notions on the MHD wave interaction with the system ionosphere-atmosphere-ground suggests that nighttime low-latitude Pi2 and Pc3 wave signatures are produced by magnetospheric fast compressional mode. The daytime near-equatorial Pc3 waves still resist a quantative interpretation. These waves may be produced by a combination of two mechanisms: compressional mode leakage through the ionosphere, and by oscillatory ionospheric current spreading towards equatorial latitudes.
AB - We have examined simultaneous ULF activity in the Pi2 and Pc3 bands at the near-equatorial magnetic stations in South America from SAMBA and MAGDAS arrays and low-orbiting CHAMP satellite during its passage over this meridional network. At the nighttime, both Pi2 and Pc3 waves in the upper ionosphere and on the ground are nearly of the same magnitude and in-phase. At the same time, the daytime Pc3 pulsations on the ground and in space are nearly out-of-phase. Comparison of observational results with the theoretical notions on the MHD wave interaction with the system ionosphere-atmosphere-ground suggests that nighttime low-latitude Pi2 and Pc3 wave signatures are produced by magnetospheric fast compressional mode. The daytime near-equatorial Pc3 waves still resist a quantative interpretation. These waves may be produced by a combination of two mechanisms: compressional mode leakage through the ionosphere, and by oscillatory ionospheric current spreading towards equatorial latitudes.
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U2 - 10.1016/j.asr.2014.11.010
DO - 10.1016/j.asr.2014.11.010
M3 - Article
AN - SCOPUS:84921599135
SN - 0273-1177
VL - 55
SP - 1180
EP - 1189
JO - Advances in Space Research
JF - Advances in Space Research
IS - 4
ER -