Large lunar tidal effects in the equatorial electrojet during northern winter and its relation to stratospheric sudden warming events

Physics

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https://doi.org/10.1002/2013JA019215
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Keywords

equatorial electrojet, lunar tide, stratospheric sudden warming, atmospheric vertical coupling, geomagnetic field, ground-based magnetometer, TIDES

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Large lunar tidal effects in the equatorial electrojet during northern winter and its relation to stratospheric sudden warming events. / Yamazaki, Yosuke.
In: Journal of Geophysical Research: Space Physics, Vol. 118, No. 11, 05.11.2013, p. 7268-7271.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Bibtex

@article{7f7f1ec732ba45a8a4669ce53f516250,

title = "Large lunar tidal effects in the equatorial electrojet during northern winter and its relation to stratospheric sudden warming events",

abstract = "It has been known for many decades that lunar tidal effects in the equatorial electrojet are greatest during northern winter; the mechanism of which has never been identified. Recent findings of the lunar tidal amplification during stratospheric sudden warming (SSW) events raise the question: To what extent do SSWs contribute to the large lunar tide during northern winter? We use ground magnetometer data at Addis Ababa for the years 1958-2007 to determine the average M-2 lunar tide in the equatorial electrojet at different seasons. When all the data are included, the amplitude of the lunar tide is largest during northern winter. However, when only the data for non-SSW winters are used, the amplitude during northern winter is not significantly larger than during other seasons. The M-2 amplitude during SSW events is approximately 3 times as large as that for non-SSW winters, and it considerably increases the amplitude of the average lunar tide during northern winter. The M-2 phase is not significantly affected by SSW events. These results indicate that the occurrence of SSW events significantly modulates the seasonal pattern of lunar tidal effects on the ionosphere.",

keywords = "equatorial electrojet, lunar tide, stratospheric sudden warming, atmospheric vertical coupling, geomagnetic field, ground-based magnetometer, TIDES",

author = "Yosuke Yamazaki",

note = "{\textcopyright}2013. American Geophysical Union",

year = "2013",

month = nov,

day = "5",

doi = "10.1002/2013JA019215",

language = "English",

volume = "118",

pages = "7268--7271",

journal = "Journal of Geophysical Research: Space Physics",

issn = "2169-9380",

publisher = "Blackwell Publishing Ltd",

number = "11",

}

RIS

TY - JOUR

T1 - Large lunar tidal effects in the equatorial electrojet during northern winter and its relation to stratospheric sudden warming events

AU - Yamazaki, Yosuke

PY - 2013/11/5

Y1 - 2013/11/5

N2 - It has been known for many decades that lunar tidal effects in the equatorial electrojet are greatest during northern winter; the mechanism of which has never been identified. Recent findings of the lunar tidal amplification during stratospheric sudden warming (SSW) events raise the question: To what extent do SSWs contribute to the large lunar tide during northern winter? We use ground magnetometer data at Addis Ababa for the years 1958-2007 to determine the average M-2 lunar tide in the equatorial electrojet at different seasons. When all the data are included, the amplitude of the lunar tide is largest during northern winter. However, when only the data for non-SSW winters are used, the amplitude during northern winter is not significantly larger than during other seasons. The M-2 amplitude during SSW events is approximately 3 times as large as that for non-SSW winters, and it considerably increases the amplitude of the average lunar tide during northern winter. The M-2 phase is not significantly affected by SSW events. These results indicate that the occurrence of SSW events significantly modulates the seasonal pattern of lunar tidal effects on the ionosphere.

AB - It has been known for many decades that lunar tidal effects in the equatorial electrojet are greatest during northern winter; the mechanism of which has never been identified. Recent findings of the lunar tidal amplification during stratospheric sudden warming (SSW) events raise the question: To what extent do SSWs contribute to the large lunar tide during northern winter? We use ground magnetometer data at Addis Ababa for the years 1958-2007 to determine the average M-2 lunar tide in the equatorial electrojet at different seasons. When all the data are included, the amplitude of the lunar tide is largest during northern winter. However, when only the data for non-SSW winters are used, the amplitude during northern winter is not significantly larger than during other seasons. The M-2 amplitude during SSW events is approximately 3 times as large as that for non-SSW winters, and it considerably increases the amplitude of the average lunar tide during northern winter. The M-2 phase is not significantly affected by SSW events. These results indicate that the occurrence of SSW events significantly modulates the seasonal pattern of lunar tidal effects on the ionosphere.

KW - equatorial electrojet

KW - lunar tide

KW - stratospheric sudden warming

KW - atmospheric vertical coupling

KW - geomagnetic field

KW - ground-based magnetometer

KW - TIDES

U2 - 10.1002/2013JA019215

DO - 10.1002/2013JA019215

M3 - Journal article

VL - 118

SP - 7268

EP - 7271

JO - Journal of Geophysical Research: Space Physics

JF - Journal of Geophysical Research: Space Physics

SN - 2169-9380

IS - 11

ER -

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