Lunar Tides in the Ionosphere

Matsushita, S.

doi:10.1007/978-3-642-46082-1_2

Cited by 46 publications

(43 citation statements)

References 131 publications

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“…Observations of the lunar tide in the upper atmosphere and ionosphere should also be mentioned. Matsushita [1967a] has reviewed the early geomagnetic observations, and he has also detailed the earlier estimates of the lunar tide in the ionosphere [Matsushita, 1967b].…”

Section: Introductionmentioning

confidence: 99%

Experiments with a lunar atmospheric tidal model

Stening¹,

Forbes²,

Hagan³

et al. 1997

J. Geophys. Res.

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Abstract. A lunar tidal model similar to that of Forbes [1982] is used to investigate the effects of changes in background zonal winds on the structure of the lunar tide in the upper atmosphere. It is found that changes in the winds have a greater effect than changes in the background temperature profile with latitude. Observed changes in the structure of the lunar tide from year to year at Saskatoon may be explained by introducing stratospheric warmings into the model. The addition of an associated mesospheric cooling gives an even better fit to the observed phase data. It is also seen that northern hemisphere warmings are predicted to give considerable amplitude changes in southern hemisphere lunar tides. It is expected that much of the difficulty in measuring lunar tides in the upper atmosphere is due to changes in the tidal parameters at these levels brought about by variations in the underlying atmosphere.

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Section: Introductionmentioning

confidence: 99%

Experiments with a lunar atmospheric tidal model

Stening¹,

Forbes²,

Hagan³

et al. 1997

J. Geophys. Res.

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“…Much of the theory of lunar tides in the ionosphere were developed by Matsushita (1967), whereas Chapman and Bartels (1940) written as:…”

Section: The Lunar Componentmentioning

confidence: 99%

Short Term Periodicities in Ionospheric Total Electron Content.

Schatten¹,

Mendillo²

1980

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“…The L current system has two vortices in each hemisphere due to the semidiurnal nature of the lunar tide. The focus of the Lq current system is generally at lower latitude than that of the focus of Sq current system (e.g., Matsushita 1967, Chapman and Fogle 1968, and Shiraki 1977. Arora et al (1980Arora et al ( , 1984 studied the latitudinal variations of solar and lunar tides in the Indian region and found the position of northern L vortex focus to be~20°N in summer (J-months) and~25°N during equinoxes (E-months) but no clear evidence of focus was seen during winter (D-months) seasons.…”

Section: Introductionmentioning

confidence: 99%

Abnormal quiet day variations in Indian region along 75° E meridian

2015

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The present study mainly focuses on the anomalous characteristics observed in some abnormal quiet day (AQD) variations of the north-south (H) and east-west (D) components of geomagnetic field at 11 Indian stations for the years 2004, 2005, and 2009 during low solar activity period for summer and winter months. In this study, during some quiet days, horizontal component (H) at stations situated near equator to the Sq focus latitudes has shown double peak structure, exhibiting maximum in the forenoon and afternoon hours. Correspondingly, declination component (D) over the low latitudes has shown features outside the normal trend, i.e., westward-directed field in the morning hours and eastward-directed field in the afternoon hours and shows negative bay-type of variations. The technique of principal component analysis (PCA) has been applied to the data sets for presenting a quantitative estimate of the influence of day-to-day variability in the Sq current system on normal (NQD) and abnormal quiet (AQD) days. AQDs observed at the Indian stations are reflected in the second principal component PC-2. Anomalous changes in day-to-day variations (H and D) are interpreted as an influence of high latitude magnetospheric current systems as well as due to single current vortex (SCV) located in the ionosphere whose focus lie between 10°and 15°N geomagnetic latitude for the northern hemisphere winter AQDs.

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Lunar Tides in the Ionosphere

Cited by 46 publications

References 131 publications

Experiments with a lunar atmospheric tidal model

Experiments with a lunar atmospheric tidal model

Short Term Periodicities in Ionospheric Total Electron Content.

Abnormal quiet day variations in Indian region along 75° E meridian

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