Faculty Profiles - SHIOKAWA, Kazuo

Papers - SHIOKAWA, Kazuo

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A stable auroral red (SAR) arc observed over Japan after an interval of very weak solar wind Reviewed

J. Geophys. Res. Vol. 106 page： 26,091-26,101 2001

Cleavage pattern modulation of frog's egg under magnetic fields of 10 tesla order Reviewed

M Iwasaka, S Ueno, K Shiokawa

INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS Vol. 14 ( 1-4 ) page： 327 - 330 2001

Language：English Publishing type：Research paper (scientific journal) Publisher：IOS PRESS

In the present study, a possible influence of intense magnetic fields on cleavage patterns during the early embryonic development of frogs was studied. The early cleavages in Xenopus laevis were disordered by horizontal magnetic fields of 10 T order. However, the magnetic field effect did not remain until when they become tadpoles.

Web of Science

Seasonal variation of gravity waves with various temporal and horizontal scales in the MLT region observed with radar and airglow imaging Reviewed

T Nakamura, T Tsuda, R Maekawa, M Tsutsumi, K Shiokawa, T Ogawa

MIDDLE ATMOSPHERE TEMPORAL AND SPATIAL STRUCTURES Vol. 27 ( 10 ) page： 1737 - 1742 2001

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

Seasonal variations of activity and horizontal propagation direction of gravity waves in the MLT region at mid-latitude over Shigaraki, Japan (35 N) are investigated for various time and spatial scales using the MU radar observations and recent airglow imaging observations. Semiannual variation with solsticial maxima and equinoctial minima are generally observed for short period (<5 hours) gravity waves. Eastward preference in summer and westward in winter for horizontal propagation direction is generally observed except for small scale (horizontal wavelength < about 15 km) gravity waves. Meridional preference such as northward in summer and southward in winter is also found in airglow imaging and some of the radar results. The preferential propagation direction between northward and eastward in summer is more commonly observed at various horizontal and time scales. (C) 2001 COSPAR. Published by Elsevier Science Ltd. All rights reserved.

DOI： 10.1016/S0273-1177(01)00310-6

Web of Science

Scopus

Three-channel imaging Fabry-Perot interferometer for midlatitude airglow measurement Reviewed

Shiokawa, K, T. Kadota, M. K. Ejiri, Y. Otsuka, Y. Katoh, M. Satoh, T. Ogawa

Appl. Opt. Vol. 40 ( 24 ) page： 4286 - 4296 2001

Thoracic spinal cord herniation presenting with Brown-Séquard syndrome Reviewed

M. Kajiwara, J. Hanakita, H. Suwa, K. Shiokawa, M. Saiki, M. Oda

Japanese Journal of Neurosurgery Vol. 10 ( 6 ) page： 389 - 393 2001

Language：English Publishing type：Research paper (scientific journal) Publisher：Japanese Congress of Neurological Surgeons

An increasing number of cases involving spinal cord herniation have been reported since the advent of magnetic resonance imaging (MRI). A 57-year-old woman with a history of previous blunt thoracic back trauma resulting from a traffic accident 9 years ago, presented with Brown-Séquard syndrome. MRI of the thoracic spine revealed ventral displacement of the spinal cord at Th4/5 and a dorsal intradural arachnoid cyst. At surgery, a dural defect about 15 mm in length was identified, into which gliotic spinal cord with arachnoid membrane herniated. The herniated spinal cord was reduced and the dural defect was repaired using Goretex. A postoperative MRI showed the spinal cord in the normal position, and her clinical symptoms improved. We reviewed the characteristics of spinal cord herniations according to the reported cases. These cases can be divided into 2 categories : spontaneous or idiopathic one and post-traumatic ones. The present case is thought to be an idiopathic one, in spite of the patient's blunt back trauma.

DOI： 10.7887/jcns.10.389

Scopus

Multi-point observation of short-period mesospheric gravity waves over Japan during the FRONT campaign Reviewed

Shiokawa K, Ejiri MK, Otsuka Y, Ogawa T, Kubota M, Igarashi K, Saito A, Nakamura T

GEOPHYSICAL RESEARCH LETTERS Vol. 27 ( 24 ) page： 4057 - 4060 2000.12

Traveling ionospheric disturbances observed in the OI 630-nm nightglow images over Japan by using a multipoint imager network during the FRONT campaign Reviewed

Kubota M, Shiokawa K, Ejiri MK, Otsuka Y, Ogawa T, Sakanoi T, Fukunishi H, Yamamoto M, Fukao S, Saito A

GEOPHYSICAL RESEARCH LETTERS Vol. 27 ( 24 ) page： 4037 - 4040 2000.12

Comprehensive imaging observations of midlatitude ionospheric disturbances during storm time substorms Reviewed

Shiokawa K, Otsuka Y, Ogawa T, Igarashi K, Miyazaki S, Rich FJ, Saito A, Yumoto Y

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS Vol. 105 ( A12 ) page： 27067 - 27080 2000.12

Distant lunar sodium tail observed in the Japanese local-time sector during the Leonid meteor shower of 1998 Reviewed

Shiokawa K, Ejiri MK, Ogawa T, Nakamura T

JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS Vol. 105 ( E10 ) page： 24621 - 24626 2000.10

A search for the springtime transition of lower thermospheric atomic oxygen using long-term midlatitude airglow data Reviewed

Shiokawa K, Kiyama Y

JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS Vol. 62 ( 13 ) page： 1215-1219 2000.9

Geomagnetic negative impulse due to a magnetic cloud observed on May 13, 1995 Reviewed Open Access

Takeuchi, T. T. Araki, H. Luehr, O. Rasmussen, J. Watermann, D. K. Milling, I. R. Mann, K. Yumoto, K. Shiokawa, T. Nagai

J. Geophys. Res. Vol. 105 ( A8 ) page： 18835 - 18846 2000.8

High- and low-altitude observations of adiabatic parameters associated with auroral electron acceleration Reviewed

Shiokawa K, Baumjohann W, Haerendel G, Fukunishi H

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS Vol. 105 ( A2 ) page： 2541 - 2550 2000.2

A search for the springtime transition oflower thermospheric atomic oxygen using long-term midlatitude airglow data Reviewed

J. Atmos. Solar Terr. Phys. Vol. 62 page： 1215-1219 2000

Multi-point observations of short-period mesospheric gravity waves over Japan during the FRONT campaign

Geophys. Res. Lett. Vol. 24 page： 4057-4060 2000

Integrating-sphere calibration of all-sky cameras for nightglow measurements Reviewed

Shiokawa K, Katoh Y, Satoh M, Ejiri MK, Ogawa T

ADVANCES IN REMOTE SENSING OF THE ATMOSPHERE FROM SPACE AND FROM THE GROUND Vol. 26 ( 6 ) page： 1025-1028 2000

"Fine structure" of the storm-substorm relationship: Ion injections during Dst decrease Reviewed

IA Daglis, Y Kamide, C Mouikis, GD Reeves, ET Sarris, K Shiokawa, B Wilken

INNER MAGNETOSPHERE DYNAMICS Vol. 25 ( 12 ) page： 2369 - 2372 2000

Language：English Publishing type：Research paper (scientific journal) Publisher：PERGAMON PRESS LTD

Following a long period of consensus on the storm-substorm relationship, a dispute on this topic has emerged in recent years. The importance of substorms for the buildup of the terrestrial ring current, which is the major element of magnetic storms, has been questioned in several studies. This paper is an effort to assess the "fine structure" of the storm-substorm relationship, by investigating the correlation between the changes in Dst and the substorm-associated O+ enhancements in the inner magnetosphere during the storm main phase. For this purpose we use energetic ion measurements from the Magnetospheric Ion Composition Spectrometer (MICS) on board the Combined Release and Radiation Effects Satellite (CRRES), and the newly produced high-resolution (5-min) Dst index for the intense storm of June 5, 1991. Substorm signatures from both MICS measurements and ground magnetometers correlate well with changes in the Dst decrease rate. This implies a significant influence of substorm occurrence on storm dynamics. (C) 2000 COSPAR. Published by Elsevier Science Ltd.

DOI： 10.1016/S0273-1177(99)00525-6

Web of Science

Scopus

Flow braking and the substorm current wedge Reviewed

Birn J, Hesse M, Haerendel G, Baumjohann W, Shiokawa K

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS Vol. 104 ( A9 ) page： 19895 - 19903 1999.9

Calibration of all-sky cameras and tilting-photometers using an integrating-sphere and a spectrometer (in Japanese) Reviewed

Katoh Yasuo, Shiokawa Kazuo, Satoh Mitsugi, Ejiri Mitsumu K., Ogawa Tadahiko

Antarctic record Vol. 43 ( 1 ) page： 1-15 1999.3

Language：English Publishing type：Research paper (scientific journal)

We report calibration of the optical instruments of the Optical Mesosphere Thermosphere Imagers (OMTI) using facilities at the National Institute of Polar Research. OMTI has been developed to investigate dynamics of the upper atmosphere through nocturnal airglow emissions. OMTI consist of an imaging Fabry-Perot interferometer, three all-sky cooled-CCD cameras, three tilting-photometers, and a spectral airglow temperature imager (SATI). The all-sky cameras and the photometers have been calibrated using a 2-m integrating-sphere and a spectrometer. Absolute sensitivity and image-flattening data are obtained together with filter transmission functions. Inhomogeneity of transmission function on the filter surface is found from the calibration using the spectrometer. We also find that filters with highly-flattened image-quality surfaces may cause serious Newton's Ring pattern on final images. Examples of the data are shown for the cameras and the photometers based on the airglow observation at Shigaraki (35°N, 136°E), Japan.

Calibration of all-sky cameras and tilting-photometers using an integrating-sphere and a spectrometer Reviewed Open Access

Katoh Y., Shiokawa K., Satoh M., Ejiri M., Ogawa T.

Antarctic Record Vol. 43 ( 1 ) page： 1 - 15 1999.3

Language：English Publishing type：Research paper (scientific journal) Publisher：Antarctic Record

DOI： 10.15094/00009066

Open Access

Scopus

Development of optical mesosphere thermosphere imagers (OMTI) Reviewed

Shiokawa K, Katoh Y, Satoh M, Ejiri MK, Ogawa T, Nakamura T, Tsuda T, Wiens RH

EARTH PLANETS AND SPACE Vol. 51 ( 7-8 ) page： 887-896 1999

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Papers - SHIOKAWA, Kazuo