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Coordinated observations of two types of diffuse auroras near magnetic local noon by Magnetospheric Multiscale mission and ground all-sky camera
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2017 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 44, no 16, p. 8130-8139Article in journal (Refereed) Published
Abstract [en]

Structured diffuse auroras are often observed near magnetic local noon (MLN), but their generation mechanisms are poorly understood. We have found that two types of structured diffuse auroras with obviously different dynamical properties often coexist near MLN. One type usually drifts from low to high latitude with higher speed and shows pulsation. The other type is always adjacent to the discrete aurora oval and drifts together with nearby discrete aurora with much lower speed. Using coordinated observations from MMS and ground all-sky imagers, we found that the two types of diffuse auroras are well correlated with number density increase of O+ (from the ionosphere) and of He2+ (from magnetosheath) ions, respectively. These observations indicate that mangetosheath particles penetrated into the magnetosphere also can play an important role for producing the dayside diffuse aurora. In addition, for the first time, electron cyclotron harmonic waves are observed associated with dayside diffuse aurora.

Place, publisher, year, edition, pages
American Geophysical Union (AGU), 2017. Vol. 44, no 16, p. 8130-8139
Keywords [en]
diffuse aurora, dayside diffuse aurora, cold plasmas, ECH wave, throat aurora, MMS
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-215392DOI: 10.1002/2017GL074447ISI: 000410658800005Scopus ID: 2-s2.0-85029380560OAI: oai:DiVA.org:kth-215392DiVA, id: diva2:1148116
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QC 20171010

Available from: 2017-10-10 Created: 2017-10-10 Last updated: 2017-10-10Bibliographically approved

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Lindqvist, Per Arne
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