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Lower Hybrid Drift Waves: Space Observations
Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen.
Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen.ORCID iD: 0000-0003-1654-841x
Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen.
Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen.
2012 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 109, no 5, article id 055001Article in journal (Refereed) Published
Abstract [en]

Lower hybrid drift waves (LHDWs) are commonly observed at plasma boundaries in space and laboratory, often having the strongest measured electric fields within these regions. We use data from two of the Cluster satellites (C3 and C4) located in Earth's magnetotail and separated by a distance of the order of the electron gyroscale. These conditions allow us, for the first time, to make cross-spacecraft correlations of the LHDWs and to determine the phase velocity and wavelength of the LHDWs. Our results are in good agreement with the theoretical prediction. We show that the electrostatic potential of LHDWs is linearly related to fluctuations in the magnetic field magnitude, which allows us to determine the velocity vector through the relation integral delta Edt . v = phi(delta B parallel to). The electrostatic potential fluctuations correspond to similar to 10% of the electron temperature, which suggests that the waves can strongly affect the electron dynamics.

Place, publisher, year, edition, pages
2012. Vol. 109, no 5, article id 055001
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Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-253610DOI: 10.1103/PhysRevLett.109.055001ISI: 000306994900014Scopus ID: 2-s2.0-84864425350OAI: oai:DiVA.org:kth-253610DiVA, id: diva2:1325464
Note

QC 20190619

Available from: 2019-06-15 Created: 2019-06-15 Last updated: 2020-01-30Bibliographically approved

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Norgren, CeciliaVaivads, AndrisKhotyaintsev, Yuri V.André, Mats

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