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The Modulation of Electromagnetic Ion Cyclotron Waves by Pc 5 Ulf Waves : Volume 27, Issue 1 (07/01/2009)

By Loto'Aniu, T. M.

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Book Id: WPLBN0003981334
Format Type: PDF Article :
File Size: Pages 10
Reproduction Date: 2015

Title: The Modulation of Electromagnetic Ion Cyclotron Waves by Pc 5 Ulf Waves : Volume 27, Issue 1 (07/01/2009)  
Author: Loto'Aniu, T. M.
Volume: Vol. 27, Issue 1
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Waters, C. L., Loto'aniu, T. M., & Fraser, B. J. (2009). The Modulation of Electromagnetic Ion Cyclotron Waves by Pc 5 Ulf Waves : Volume 27, Issue 1 (07/01/2009). Retrieved from

Description: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA. The modulation of electromagnetic ion cyclotron (EMIC) waves by longer-period ULF waves has been proposed as a method for producing pearl structured Pc 1–2 EMIC waves. This study examines frequency and phase relationship between Pc 1 EMIC wavepacket envelopes and simultaneously occurring Pc 5 ULF waves using magnetic data measured by the CRRES spacecraft. Intervals from three days in 1991 where CRRES observed pearls are presented along with simple statistics for 58 EMIC wavepackets. The observations were dominated by EMIC waves propagating away from the equatorial region. Comparisons between pearl wavepacket envelopes and Pc 5 waves show excellent agreement. The pearl wavepacket duration times, Τdur, were statistically correlated with Pc 5 wave periods, TPc5, resulting in a correlation coefficient of R=0.7 and best fit equation Τdur=0.8·TPc5+6 s. In general, phase differences varied although time intervals of constant in-phase or anti-phase correlation were observed. Anti-phase modulation may be explained by a decreasing background magnetic field due to the negative cycle of the ULF wave decreasing Alfvén velocity and minimum resonant energy. In-phase modulation could be the result of adiabatic modulation of temperature anisotropy in-phase with variations in the background field. Non-adiabatic processes may contribute to intervals that showed varying phase differences with time. Results suggest that future theoretical developments should take into account the full range of possible wave particle interactions inside the magnetosphere.

The modulation of electromagnetic ion cyclotron waves by Pc 5 ULF waves

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