Earth, Planets and Space
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Some new features of ionospheric plasma depletions over the Indian zone using all sky optical imaging
Earth, Planets and Space - Tập 52 - Trang 549-559 - 2014
An all sky optical imaging system was operated from Sriharikota rocket range
(SHAR) (14°N, 80°E, 5.5°N dip latitude) during January–March, 1993 to observe
ionospheric plasma depletions through 630 nm and 777.4 nm night glow emissions.
Strong plasma depletions were observed only on four nights viz., 14, 17, 19 and
21 February, 1993. Except the 17 February, which was a magnetically disturbed
day, al...
A simple method to evaluate the uncertainty of magnetotelluric forward modeling for practical three-dimensional conductivity structure models
Earth, Planets and Space - Tập 75 - Trang 1-17 - 2023
The forward calculation of magnetotelluric (MT) responses is generally assumed
to be sufficiently accurate compared with typical observational errors in
practical modeling and inversion studies. Although the uncertainty of the
forward calculation may be examined by comparison with analytical or other
numerical solutions for some simple models, such an examination does not
guarantee that the uncert...
A climatology study on ionospheric F2 peak over Anyang, Korea
Earth, Planets and Space - Tập 63 - Trang 335-349 - 2011
We analyzed peak electron densities (NmF2) and peak heights (hmF2)of F2 layer,
measured by a digisonde at Anyang (37.4°N, 127.0°E, Geomag = 27.7°N, 196.9°E)
during the period of April 1998 through April 2008. The Anyang NmF2 and hmF2
values averaged over each month show generally good linear relationship with
increasing solar activities for all local time and for various geomagnetic
activities. Th...
Dislocation model for strain accumulation in a plate collision zone
Earth, Planets and Space - Tập 52 - Trang 1091-1094 - 2014
Following a scheme developed for a subduction zone by Savage in 1983, which was
successfully applied to a transform plate boundary by Matsu’ura and others in
1986, a dislocation model for a plate collision zone is formulated. The solution
consists of a rigid plate motion and a tensile dislocation. In addition to this,
a strike-slip dislocation is needed when the collision boundary is not
perpendic...
Investigation of geomagnetic reference models based on the Iridium $$^{\circledR }$$ constellation
Earth, Planets and Space - Tập 74 - Trang 1-21 - 2022
The World Magnetic Model (WMM) is a geomagnetic main field model that is widely
used for navigation by governments, industry and the general public. In recent
years, the model has been derived using high accuracy magnetometer data from the
Swarm mission. This study explores the possibility of developing future WMMs in
the post-Swarm era using data from the Iridium satellite constellation. Iridium
...
Special Issue “Global data systems for the study of solar-terrestrial variability”
Earth, Planets and Space - Tập 69 Số 1 - 2017
Estimation of shallow S-wave velocity structure using microtremor array exploration at temporary strong motion observation stations for aftershocks of the 2016 Kumamoto earthquake
Earth, Planets and Space - Tập 68 - Trang 1-10 - 2016
Shallow S-wave velocity V S profiles were estimated for 26 temporary strong
motion observation sites surrounding the epicenters of a sequence of the 2016
Kumamoto earthquake. The microtremor array method was used to gather the
dispersion characteristics of Rayleigh waves. V S profiles were obtained by
inverting the dispersion curves for each site and those of three permanent
strong motion stations...
Seismic and aseismic fault slip before and during the 2011 off the Pacific coast of Tohoku Earthquake
Earth, Planets and Space - Tập 63 - Trang 637-642 - 2011
The March 11, 2011, off the Pacific coast of Tohoku Earthquake is the first
great subduction zone earthquake to be recorded by a dense, modern network of
geodetic quality Global Positioning System (GPS) receivers, and hence presents
an unprecedented opportunity to study the evolution of fault slip during the
time periods immediately before, during, and after a truly great earthquake. We
utilized s...
Development of a coronal mass ejection arrival time forecasting system using interplanetary scintillation observations
Earth, Planets and Space - Tập 71 - Trang 1-11 - 2019
Coronal mass ejections (CMEs) cause disturbances in the environment of the Earth
when they arrive at the Earth. However, the prediction of the arrival of CMEs
still remains a challenge. We have developed an interplanetary scintillation
(IPS) estimation system based on a global magnetohydrodynamic (MHD) simulation
of the inner heliosphere to predict the arrival time of CMEs. In this system,
the ini...
Subsurface structures derived from receiver function analysis and relation to hypocenter distributions in the region from the eastern Shikoku to the northern Chugoku districts, Southwest Japan
Earth, Planets and Space - Tập 60 - Trang 573-579 - 2008
We carried out receiver function imaging to estimate detailed configurations of
the Philippine Sea (PHS) slab beneath the Shikoku and Chugoku districts and
crustal structures in the region. We used two temporary seismic arrays with an
average station spacing of about 10 km in the Chugoku district. Beneath Shikoku
a clear northward dipping discontinuity at about 20–40 km depth was found, with
other...
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