Wobbling Motion of the Geomagnetic Dipole Field in Historic Time During These 2000 Years

Kawai, Naoto; Hirooka, Kimio

doi:10.5636/jgg.19.217

Cited by 37 publications

(9 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The curve in Fig. 1 obtained from a comparison of Occidental and Oriental aurorae seems to be in accordance with the result obtained by Kawai et al (1965), through our preliminary result is still of insufficient accuracy to test the wobbling motion of the geomagnetic field in historic time as suggested by Kawai and Hirooka (1967).…”

Section: Ancient Aurora! Records In Chinasupporting

confidence: 77%

Archaeo-Aurora and Geomagnetic Secular Variation in Historic Time

Keimatsu

Fukushima

Nagata

1968

J. geomagn. geoelec

View full text Add to dashboard Cite

In order to trace the secular variation of the geomagnetic field in historic time, the documents of ancient aurorae can be utilized. In China, Korea and Japan, there are a number of valuable records, which can be reasonably supposed to describe the events of auroral appearance. After a comparison of these descriptions with those in Europe, the archaeo-secular variation in the geomagnetic field can be inferred. A preliminary examination of the aurora! appearance on the same day in the Occident and Orient suggests that the geomagnetic dipole axis might have been inclined towards China around 11-12th centuries AD.

show abstract

Section: Ancient Aurora! Records In Chinasupporting

confidence: 77%

Archaeo-Aurora and Geomagnetic Secular Variation in Historic Time

Keimatsu

Fukushima

Nagata

1968

J. geomagn. geoelec

View full text Add to dashboard Cite

show abstract

“…This is not the case for archeomagnetic measurements for the interval 250 AD. to 750 A.D. For example, virtual poles for archeomagnetic results from Arizona and Japan (Kawai and Hiraoka, 1967) are 16 degrees apart, which is larger than experimental error and is comparable with the dispersion in virtual poles due to the present dipole field.…”

Section: Interval Of 1500 Yearsmentioning

confidence: 57%

Changes in the Total Magnetic Energy External to the Earh's Core

Verosub

Cox

1971

J. geomagn. geoelec

View full text Add to dashboard Cite

The loss of magnetic energy accompanying the decrease in the earth's dipole field during the past 50 years has been shown by McDonald and Gunst to have been balanced by an equal increase in the energy of the nondipole field. It is shown that over time intervals of the order of 2000 years, conservation of the total magnetic energy stored outside the earth's core is not indicated by paleomagnetic measurements of ancient directions and intensities of the field. However during the in the total magnetic energy during the past 120 years at an annual rate of 0.01 percent, which is much less than the average rate during the past 1550 years inferred from paleomagnetic measurements.

show abstract

“…8). The motion is similar to the quasi-hypotrochoid motion proposed for the dipole wobble by KAWAI and HIROOKA (1967). They explained the motion of VGP from the archeomagnetic data by combining two different rotations of a main dipole; one rotation has a period longer than the other and its rotational sense is opposite to the others.…”

mentioning

confidence: 72%