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Volume 37, Issue 10
Displaying 1-5 of 5 articles from this issue
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Koh-ichiro OYAMA, Kunio HIRAO1985 Volume 37 Issue 10 Pages 913-926
Published: 1985
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSEnergy distribution of low energy (0.2-2.5eV) electrons was measured by means of Langmuir probe at eleven o'clock J. S. T. on the 13th, February, 1982 over Kagoshima Space Center, Japan. Second derivative of the V-i curve which is necessary to get the energy distribution function was obtained by means of the second harmonic method. The second derivatives obtained at lower ionosphere (90-150Km) showed clear peaks at the energies which correspond to the wave length of excited gas emissions. Some of these peaks were identified as due to O and O2. The results conclusively suggest that electrons of thermal energy range interact with ambient excited neutral (and/or ionized) gases and gain energy from them.View full abstractDownload PDF (1307K) -
Hisao YAMAGISHI, Takayuki ONO, Hiroshi FUKUNISHI, Takamasa YAMAGAMI, J ...1985 Volume 37 Issue 10 Pages 927-943
Published: 1985
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSA stratospheric balloon, carrying a NaI (T1) scintillation counter for measuring 20-100keV bremsstrahlung X-ray was launched from Stamsund (L=5.6) in Norway during the recovery phase of a magnetospheric substorm. The scintillation counter recorded X-ray pulsations with periods of 20-30s when the balloon was located at L=5.4-4.8 and at 0950-1300 MLT. A rising tone type of quasi-periodic (QP) VLF emissions and Pc 3 magnetic pulsations observed at Andøya (L=6.15), located at 160km northeast of Stamsund, were closely associated with these X-ray pulsations. The one-to-one correspondence between occurrences of QP emissions and enhancements of X-ray count rate suggests that QP emissions (whistler mode waves) modulate the pitch angle diffusion rate of energetic electrons trapped in the magnetosphere through the cyclotron interaction. Further a close relation between QP emissions and Pc 3 magnetic pulsations suggests that compressional mode Pc 3 waves propagating in radial direction from the dayside magnetopause toward the earth modulate the growth rate of whistler mode waves.View full abstractDownload PDF (1625K) -
I. KIMURA, T. MATSUO, M. TSUDA, K. YAMAUCHI1985 Volume 37 Issue 10 Pages 945-956
Published: 1985
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSA three dimensional (3-D) ray tracing technique for whistler mode signals in the earth magnetosphere using a non-dipolar geomagnetic field model is investigated. A difficulty arising from the adoption of a general field model in ray tracing is that field line tracing is additionally required at every step of the calculation. This is because the plasma density profile such as the diffusive equilibrium model are defined along a geomagnetic field line which cannot be analytically determined in the general field model. To substantially reduce the computer time a minimum number of field line tracing are made in advance, and in the course of ray tracing some interpolation is utilized. The error arising from such interpolations is checked and is found to be insignificant. Some examples of ray tracing are shown. The ray path of 5kHz signals starting from the bottom of the ionosphere of the Siple (64.9°S, 7.5°W in geomagnetic coordinates) meridian is found to deviate eastward by about 15° at the apex.View full abstractDownload PDF (1098K) -
Ichiro NAKAGAWA, Takeshi YUKUTAKE1985 Volume 37 Issue 10 Pages 957-977
Published: 1985
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSRectangular harmonic analyses are applied to the vector data acquired by MAGSAT to make altitude correction and to obtain anomaly maps over the area of the Japanese islands at a specific altitude. For the analyses local Cartesian coordinates are adopted with the origin at 35°N, 140°E, taking the x-axis to the north, the y-axis to the east, and the z-axis vertically downward. Not only the position of measuring points but also each component of the magnetic field are transformed from geocentric coordinates to these local Cartesian coordinates. From the component data, a magnetic scalar potential is derived by expanding in double Fourier series with x and y coordinates, of which each term decays in the negative z-direction.
The magnetic potential is first computed for the area of 4000×4000km, terminating the series at n=m=3. Then, in order to see finer structures of the magnetic anomaly, the potential is derived for the area of 2000×2000km with the maximum order of n=m=3. Synthesized maps drawn for the altitude of 300km show three features of magnetic anomalies over Japan and its surrounding area. 1) An intense positive anomaly of the vertical component which runs along the Kuril trench from the Kuril Islands to southeastern Hokkaido. 2) A pair of positive and negative vertical anomalies that cover the area from northern Korea to East China, suggesting the existence of a very localized magnetization in the southwestern tip of the Korean Peninsula. 3) The Sea of Japan anomalies consisting of a negative anomaly of the vertical component that covers the northeastern part, and a positive anomaly covering the southwestern part.View full abstractDownload PDF (2204K) -
Hideo TSUNAKAWA, Kosuke HEKI, Kazuo AMANO1985 Volume 37 Issue 10 Pages 979-985
Published: 1985
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSDownload PDF (560K)
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