Articles | Volume 36, issue 5
Ann. Geophys., 36, 1335–1346, 2018
https://doi.org/10.5194/angeo-36-1335-2018
Ann. Geophys., 36, 1335–1346, 2018
https://doi.org/10.5194/angeo-36-1335-2018

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.

Data sets

THEMIS NASA http://themis.ssl.berkeley.edu

Space Physics Data Facility (SPDF) Goddard Space Flight Center (NASA) https://spdf.sci.gsfc.nasa.gov/

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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.