Articles | Volume 36, issue 5
Ann. Geophys., 36, 1335–1346, 2018
Ann. Geophys., 36, 1335–1346, 2018
Regular paper
08 Oct 2018
Regular paper | 08 Oct 2018

Statistical study of ULF waves in the magnetotail by THEMIS observations

Shuai Zhang et al.

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Cited articles

Allan, W. and Poulter, E. M.: Ulf waves-their relationship to the structure of the earth's magnetosphere, Rep. Prog. Phys., 55, 533–598,, 1992. 
Allan, W., White, S. P., and Poulter, E. M.: Impulse-excited hydromagnetic cavity and field-line resonances in the magnetosphere, Planet. Space Sci., 34, 371–385,, 1986. 
Angelopoulos, V.: The THEMIS mission, Space Sci. Rev., 141, 5–34,, 2008. 
Baumjohann, W. and Glassmeier, K. H.: The transient response mechanism and Pi2 pulsations at substorm onset: Review and outlook, Planet. Space Sci., 32, 1361–1370,, 1984. 
Short summary
The features of ULF waves are statistically studied on the magnetotail stretched magnetic field lines (8 RE < R < 32 RE) by using 8 years of THEMIS data. The occurrence rates of ULF waves are higher in the post-midnight region than pre-midnight region. The frequency decreases with increasing radial distance of 8–16 RE and could be explained by much more standing waves in this region than in the region of 16–32 RE. The wave frequency is higher after the substorm onset than before it.