巻号一覧
38 巻, 8 号
選択された号の論文の7件中1～7を表示しています
- |<
- <
- 1
- >
- >|
-
A Case Study on the Disturbed Stratospheric Aerosol Layer by the Volcanic Eruption of Mt. El ChichonYasunobu IWASAKA1986 年 38 巻 8 号 p. 729-740
発行日: 1986年
公開日: 2010/09/14
ジャーナル フリーTotal depolarization ratio has been used to detect nonspherical particles in the stratosphere. This parameter is effective only when the mixing ratio of the particles is enough high. Particle depolarization ratio (Dp) is compared with the total depolarization ratio (D) on the basis of the lidar measurements made at Nagoya, Japan, during the post-El Chichon period. The comparison suggests that the particle depolarization ratio is more effective than the total depolatization ratio when the mixing ratio is lower than about one.抄録全体を表示PDF形式でダウンロード (789K) -
A. NISHIDA, K. MAEZAWA1986 年 38 巻 8 号 p. 741-757
発行日: 1986年
公開日: 2010/09/14
ジャーナル フリーThe dependence of the Jovian non-Io-related decametric emission on solar wind parameters demonstrates that the energy of the solar wind is imparted to the Jovian magnetosphere. This paper considers if, and then how, the steady-state reconnection model can be used for the understanding of this energy transfer process. Referring to the observationally obtained values of key parameters as much as possible, we investigate if the steady state model as commonly applied for the earth's magnetosphere can be adopted as a reasonable approximation for the Jovian magnetosphere as well. We find that rapid rotation of the planet does not present a serious obstacle to a steady progress of reconnection since the motion of the field lines is governed by the magnetosheath plasma and the slipping occurs at the ionospheric ends. Next we discuss the convection generated by reconnection for northward and southward polarities of the interplanetary magnetic field, and address the field line motion in the tail and the current system generated in the ionosphere. Influence of the centrifugal force on the motion of field lines in the inner region of the magnetosphere is also discussed.抄録全体を表示PDF形式でダウンロード (1573K) -
Ken-ichi MAEDA1986 年 38 巻 8 号 p. 759-769
発行日: 1986年
公開日: 2010/09/14
ジャーナル フリーAccording to the rocket experiments carried out off the coast of Peru, the electron density profile (Ne-h) has two peaks, one at about 105km and the other at 113-114km, which is a distinctive feature found nowhere else.
The meridional dynamo current near noon is divided into two parts, supported by the electron and the ion flows. Under the condition of zero divergence of the total current, the divergence of the electronic or the ionic current is separately obtained, which is not zero in general. The non-zero divergence of the electronic current, which is equivalent to the time rate of change of the electronic charge, is given by ∂(jyσi1/σ2)/∂z, where σi1, σ2 and jy are the ionic Pedersen conductivity, the total Hall conductivity and the eastward jet current. The balance between the electron production rate by the solar ionizing radiation and the recombination of electrons and ions is affected by ∂(jyσi1/σ2)/∂z, which is a kind of transport process to cause the concentration or the rarefaction of the electron density. It is shown that the presence of two peaks in the Ne profile can be explained by this transport process.抄録全体を表示PDF形式でダウンロード (717K) -
S. OHSHIMA, M. TAKANO, T. MAKINO, M. NAKAMURA1986 年 38 巻 8 号 p. 771-777
発行日: 1986年
公開日: 2010/09/14
ジャーナル フリーA new observation system of OH airglow was developed for balloon-borne experiments to obtain a better resolution in space and time than with a usual scanning photometer. The system consists of a camera lens, a two-dimensional solid state image sensor combined with an image intensifier tube and a microcomputer. The performance of the system was tested by ground based observation and it was proven to be satisfactory. Intensity variations in a few minutes were observed by using this system.抄録全体を表示PDF形式でダウンロード (1043K) -
Takashi SHIBATA1986 年 38 巻 8 号 p. 779-796
発行日: 1986年
公開日: 2010/09/14
ジャーナル フリーThe daytime horizontal trace velocities (Vh) of medium-scale traveling ionospheric disturbances (TID) observed with a network of HF Doppler receivers in central Japan from 17 September to 11 October 1982 are analyzed. The TID with a specified wave period of 40min are found to fall into two separate classes not previously distinguished; i. e., the first class has Vh≤3×102ms-1 with the propagation azimuth in a confined range of about ±40° around the southeast direction, whereas the other has Vh≥4×102ms-1 with the omnidirectional features. The results are discussed in the light of atmospheric gravity wave theory. It is concluded that while the first class can be identified with the internal gravity waves, the second class may be explicable in terms of the quasi-evanescent gravity waves inherent to the dissipative thermosphere.抄録全体を表示PDF形式でダウンロード (1571K) -
Sunhee LEE, F. E. M. LILLEY1986 年 38 巻 8 号 p. 797-806
発行日: 1986年
公開日: 2010/09/14
ジャーナル フリーSufficient paleomagnetic data of wide distribution now exist for their use in the determination of terms of higher degree than dipole in the past geomagnetic field. For times older than 5Myr it is necessary to carry out global reconstructions based upon information from sea-floor spreading. Best fits of second and third degree zonal terms (quadrupole and octupole), normalised by the dipole term, may then be obtained for spherical harmonic descriptions of the past geomagnetic field.
Such paleomagnetic results are examined for their significance for dynamo theory, using the analysis developed in terms of spherical harmonics by BULLARD and GELLMAN (1954), and applied to mean field electrodynamics by ROBERTS and STIX (1972). The paleomagnetic results provide data for ratios of the values at the coremantle boundary of the radial functions which describe the tonal dipole, quadrupole and octupole geomagnetic components. The variations with time of these ratios over the last 200Myr indicate an evolution of the geodynamo, and show that the octupole geomagnetic component may be linked to the dipole geomagnetic component in a more steady manner than is the quadrupole geomagnetic component. One possible interpretation of such an observation is that it indicates different patterns of behaviour between quadrupole and dipole-octupole fluid flow components in the earth's core.抄録全体を表示PDF形式でダウンロード (784K) -
Leroy R. ALLDREDGE, Edward R. BENTON1986 年 38 巻 8 号 p. 807-821
発行日: 1986年
公開日: 2010/09/14
ジャーナル フリーThe Fourier power spectra of geomagnetic component values, synthesized from spherical harmonic models, have been computed for circular paths on the Earth's surface. They are not found to be more useful than is the spectrum of magnetic energy outside the Earth for the purpose of separating core and crustal sources of the geomagnetic field. The Fourier power spectra of north and east geomagnetic components along nearly polar great circle paths exhibit some unusual characteristics that are explained by the geometric perspective of Fourier series on spheres developed by Y. K. Yee.抄録全体を表示PDF形式でダウンロード (1001K)
- |<
- <
- 1
- >
- >|