Results 81 to 90 of about 130 (107)
Some of the next articles are maybe not open access.
A geomagnetic jerk for the early 1990's
Earth and Planetary Science Letters, 1996Abstract Records from geomagnetic observatories in Europe are showing indications of another impulse in the third time derivative of the east component around 1991. These impulses, otherwise known as jerks, have occurred in the past at about 1925, 1969 and 1978 and possibly also 1900 and 1913.
Susan Macmillan
exaly +2 more sources
Was the 1970 geomagnetic jerk of internal or external origin?
Nature, 1982Annual mean data from worldwide magnetic observatories show that there was a jerk1 (step-change in the second time derivative) in the geomagnetic field, which took place over an interval of
S R C Malin
exaly +2 more sources
Geomagnetic jerk extraction based on the covariance matrix
Applied Geophysics, 2019We normalize data from 43 Chinese observatories and select data from ten Chinese observatories with most continuous records to assess the secular variations (SVs) and geomagnetic jerks by calculating the deviations between annual observed and CHAOS-6 model monthly means.
Yi Jiang
exaly +2 more sources
On external and internal parts of the geomagnetic jerk of 1970
Physics of the Earth and Planetary Interiors, 1985This paper is a short contribution to the debate on sources (external or internal) of the geomagnetic acceleration phenomenon (jerk) around 1970. Using annual means of very quiet days it is shown here that the external part in the jerk signal in Ydot in North Europe was rather small.
exaly +2 more sources
The origin of geomagnetic jerks
Nature, 2002Geomagnetic jerks, which in the second half of the twentieth century occurred in 1969 (refs 1, 2), 1978 (refs 3, 4), 1991 (ref. 5) and 1999 (ref. 6), are abrupt changes in the second time-derivative (secular acceleration) of the Earth's magnetic field.
Jeremy, Bloxham +2 more
openaire +2 more sources
Chandler wobble and geomagnetic jerks
Physics of the Earth and Planetary Interiors, 2001Abstract Some features of the polar motion may be due to core–mantle coupling, but no convincing quantitative mechanism has yet been proposed. Considering phase jumps in the Chandler wobble and noticing their correlation with geomagnetic jerks [J. Geophys. Res.
E. Bellanger +3 more
openaire +1 more source
Localized analysis of polar geomagnetic jerks
Tectonophysics, 2013Abstract A new method is introduced to find the relatively sudden temporal changes or jerks of the geomagnetic field over the polar regions. Geomagnetic jerk events during the 20th century have mostly been identified from direct measurements at mid-latitude geomagnetic observatories.
Hyung Rae Kim, Ralph R.B. von Frese
openaire +1 more source
Automatic quality control for geomagnetic observatories and fast detection of geomagnetic jerks
2023MOSFiT (Magnetic Observatories and Stations Filtering Tool) is a python package to visualize and filter data from magnetic observatories and magnetometer stations. The purpose of MOSFiT is to automatically isolate and analyze the secular variation (SV) information contained in geomagnetic observatories data.
Siqueira Da Silva, M. +3 more
openaire +2 more sources
More on the alleged 1970 geomagnetic jerk
Physics of the Earth and Planetary Interiors, 1985Abstract French and United Kingdom workers have published reports describing a sudden change in the secular acceleration, called an impulse or a jerk, which took place around 1970. They claim that this change took place in a period of a year or two and that the sources of the alleged jerk are internal. An earlier paper by this author questioned their
openaire +1 more source
On the Spectrum of Geomagnetic Variations Accompanying Jerks
Izvestiya, Physics of the Solid EarthBased on the data of several spaced magnetic stations, the spectrum of geomagnetic variations is studied in the range of periods from two to 40 years. Special attention is paid to spectral features in the supposed range of action of intraterrestrial processes that cause geomagnetic jerks.
S. A. Riabova, S. L. Shalimov
openaire +2 more sources