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Volume 32 (1980)
- Issue 12 Pages 721-
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Volume 27 (1975)
- Issue 6 Pages 453-
- Issue 5 Pages 363-
- Issue 4 Pages 265-
- Issue 3 Pages 175-
- Issue 2 Pages 85-
- Issue 1 Pages 1-
Volume 27, Issue 6
Displaying 1-6 of 6 articles from this issue
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Atsuhiro NISHIDA1975 Volume 27 Issue 6 Pages 453-469
Published: 1975
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSOur present knowledge on the acceleration process in the magnetospheric plasma is reviewed and major problems are summarized. Acceleration processes can be classified into three categories. First, acceleration can be made by the reconnection process in the magnetotail. The occurrence of reconnection during substorm expansion phases has been confirmed but details of the energy conversion mechanism need be clarified. Second, acceleration by the electric potential drop along magnetic field lines has been strongly suggested from observations of precipitating particles. The position and structure of the potential layer, however, have not been clarified, and theoretical understanding of the process is still in the early stage of development. Third, particles can be adiabatically heated as they are driven toward the earth in the course of their convective motion. Spatial structure and dynamical development of the auroral precipitation pattern represent both challenge and clue to the understanding of the magnetospheric acceleration process.View full abstractDownload PDF (1545K) -
Nobuyoshi FUGONO1975 Volume 27 Issue 6 Pages 471-484
Published: 1975
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSAn ionospheric simulation experiment has been performed in a large vacuum chamber. The chamber is filled with NO and other gases including N2, O2, CO2, NH3 and H2O in the pressure range of 10-2 Torr. A lamp which produces photons at 1236 and 1165A by means of microwave discharge in krypton is utilized as an ionization source.
In addition to 30+ large quantities of the water cluster ions 55+, H3O+·(H2O)2, 73+, H3O+·(H2O)3 and 91+, H3O+·(H2O)4 were observed when nitric oxide and water were present. This closely approximates the condition of the terrestrial D region. After long periods of UV irradiation 74+ and 104+ ions grow in intensity. These ions are tentatively identified as NO+. N2O and NO+·NO·N2O. In addition the series 18+, 36+, 54+ and 72+ is detected which can be labeled NH4+, NH4+·(H2O), NH4+·(H2O)2 and NH4+·(H2O)3. These same species of ions are observed with the introduction of ammonia into the chamber. Presumably both N2O and NH3 are products of the photolysis.View full abstractDownload PDF (1302K) -
G. L. SISCOE, L. CHRISTOPHER1975 Volume 27 Issue 6 Pages 485-489
Published: 1975
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSThe purpose of this note is to point out: 1) that during geomagnetic reversals and excursion, the zones of frequent auroral occurrence will be located at very different geographical positions than at present; and 2) that two of the most recent excursions that have been suggested, the Laschamp-Gothenburg and the Lake Mungo events, are dated in upper paleolithic period (ca. 12, 000yr BP and 30, 000yr BP respectively (NÖEL and TARLING, 1975; MÖRNER and LANSER, 1975; BARBETTI and MCELHINNY, 1972; FREED and HEALY, 1974)), and could have produced frequent auroral displays to major populations of stone age people. The second point might be important because it opens the possibility that some of the previously uninterpreted artifacts and drawings from this period could be representations of auroral forms.View full abstractDownload PDF (496K) -
F. E. M. LILLEY1975 Volume 27 Issue 6 Pages 491-504
Published: 1975
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSThe process of electromagnetic induction in a layered half-space depends on the horizontal scale-length of the source field, whether it has the form of a running wave or a standing wave, and whether it consists of mixed modes. The theory as traditionally applied to geomagnetic depth sounding depends on approximating natural source-fields by single-mode running waves.
Magnetometer array data can be interpreted to show whether source fields are in fact running waves or standing waves. Phase maps of array data give wave-length estimates for running waves; amplitude maps of array data give field gradients (but usually not wave-length estimates) for standing waves. Commonly superpositions exist of both running waves and standing waves, indicating possible errors in traditional depth-sounding estimates which are based on the theory of a single-mode running wave.
Lack of source-field knowledge is a more serious disadvantage in traditional geomagnetic depth-sounding than it is in a newer method, which involves the ratio of vertical component to horizontal gradient measured from array data.View full abstractDownload PDF (1184K) -
S. O. IFEDILI1975 Volume 27 Issue 6 Pages 505-510
Published: 1975
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSDownload PDF (632K) -
J. Hanumath SASTRI1975 Volume 27 Issue 6 Pages 511-515
Published: 1975
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSDownload PDF (2773K)
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