A lunar tide in the Dst index.

Stening, R. J.

doi:10.5636/jgg.42.11

Cited by 5 publications

(2 citation statements)

References 11 publications

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“…The 24 hour peak, and subsequent harmonics, gives evidence that removal of the Sq is not ideal. Lunar tidal variations of ionospheric origin have also been identified in Dst [ Stening , 1990].…”

Section: Analysis and Resultsmentioning

confidence: 99%

High‐resolution global storm index: Dst versus SYM‐H

Wanliss¹,

Showalter²

2006

J. Geophys. Res.

333

266

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The classic view is that Dst and SYM‐H time series differ mainly due to the dissimilarity in the method to determine the base values. Dst and SYM‐H are both indices designed to measure the intensity of the storm time ring current. They are calculated in similar but not identical manners. Since SYM‐H has the distinct advantage of having 1‐min time resolution compared to the 1‐hour time resolution of Dst, it is worth determining if the differences introduced by using different ground stations and slightly different methods of baseline subtraction produce statistically significant differences in the values of the indices. We have examined data from these indices collected over more than 20 years to determine the extent to which Dst and SYM‐H are equivalent or different. We found that a simple combination of linear trends with a break at SYM‐H = −300 nT provides an excellent comparison with the Dst index. For quiet times and for small storms the deviations are typically no more than 10 nT. Moderate storms feature deviations typically only slightly more than 10 nT, and intense storms have deviations that are usually less than 20 nT. We conclude that the classic view is accurate and recommend that in future studies the SYM‐H index be used as a de facto high‐resolution Dst index.

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Section: Analysis and Resultsmentioning

confidence: 99%

High‐resolution global storm index: Dst versus SYM‐H

Wanliss¹,

Showalter²

2006

J. Geophys. Res.

333

266

View full text Add to dashboard Cite

show abstract

“…Thermospheric and ionospheric changes during a storm [Fuller-Rowell et al, 1994], which prevent quiet-day ionospheric dy namo currents from flowing, generate their own disturbance; yet a correction for the non existent quiet-day currents is made in the in dex formulation. There are lunar-time (ionospheric dynamo) variations in the pre sent Dst index [Stenning, 1990]. The quiettime main field that is subtracted, in the Dst formulation, is not the main field at stormtime when that field is severely distorted by strong solar wind; the Gauss coefficients (rep resenting the main field) clearly show distur bance-time dependence.…”

Section: Pages 283 285mentioning

confidence: 99%

Dst is not a pure ring‐current index

Campbell

1996

EoS Transactions

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The Equatorial Dst Ring‐Current Index, Dst, distributed internationally by the World Data Center C2 for Geomagnetism (Faculty of Science, Kyoto University) is widely used in geophysics as an indicator of geomagnetic storm behavior. At the recent Chapman Conference on Magnetic Storms held at the Jet Propulsion Laboratory in Pasadena, Calif., from February 11 to 16, 1996, three of the conference summary speakers formally announced that the Dst index should not be considered to be a simple representation of the ring current of a storm because other sources significantly contribute to that index formulation. This assertion went unchallenged by those in attendance. Such understanding represents a major change from the traditional belief that the index is a direct result of the geomagnetic storm‐time growth and recovery of a Saturnlike ring of particles encircling the Earth. This old model is indeed beautiful, but inherently wrong and inadequate for the many uses to which Dst has been assigned over the years. The paragraphs below describe some of the backgrou nd for this new viewpoint and suggest how the characteristic storm shape may arise.

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The Magnetospheric Disturbance Ring Current as a Source for Probing the Deep Earth Electrical Conductivity

Campbell¹

1990

Deep Earth Electrical Conductivity

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A lunar tide in the Dst index.

Cited by 5 publications

References 11 publications

High‐resolution global storm index: Dst versus SYM‐H

High‐resolution global storm index: Dst versus SYM‐H

Dst is not a pure ring‐current index

The Magnetospheric Disturbance Ring Current as a Source for Probing the Deep Earth Electrical Conductivity

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