巻号一覧
23 巻, 2 号
選択された号の論文の11件中1～11を表示しています
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Ken-ichi MAEDA1971 年 23 巻 2 号 p. 133-159
発行日: 1971/11/25
公開日: 2010/09/14
ジャーナル フリーThe daytime N(h) profiles in the E and D regions are obtained for summer, spring and fall, and winter, based on data available from rocket experiment. The profiles cover the periods of low, medium and high solar activity.
The Nmax in the normal E region obtained by routine ionosonde observation is studied to compare with the rocket data and to obtain the solar activity dependence of Nmax or Φ0, the solar photon flux density at λ=1025.7Å and 977Å, which controls the Nmax in the E region. From the satellite observation of the solar X ray flux at λ=1-8Å, the solar activity dependence of the X ray flux, which controls the ionization at the lower part of the E region, is tentatively estimated.
Based on the result of the above study the N(h) profiles are calculated, following the current theory of the E region formation, for each case of the observed N(h) profiles as described above. Fairly good agreement is found between the theory and experiment. Thus we can know the N(h) profile for any season in any solar activity.
Some nighttime profiles are studied from rocket data and the nocturnal variation of the N(h) in the E region is obtained. Based on this result the electron production rate of geocorona, a possible nighttime source of ionization, and the effective recombination coefficient are estimated.
Finally the N(h) profile during winter absorption anomaly is calculated, based on some atmospheric temperature models, which are available from actual rocket observations. It is found that the E layer comes down and this enables one to interpret the lowering of the reflection height of the Loran waves during anomaly reported by other workers.抄録全体を表示PDF形式でダウンロード (2580K) -
K. HIRAO, K. OYAMA1971 年 23 巻 2 号 p. 161-167
発行日: 1971/11/25
公開日: 2010/09/14
ジャーナル フリーIntercomparison between the Langmuir probe and the electron temperature probe which has been developed by the authors, in the measuring of the electron temperature, was carried out two times by using two rockets, K-9M-28 and K-9M-29.
The difference between the results obtained with two probes will be discussed and the inconsistency between the electron temperature obtained with the rocket probe and the Thomson scattering method will be also discussed.抄録全体を表示PDF形式でダウンロード (2301K) -
J. D. TARPLEY1971 年 23 巻 2 号 p. 169-179
発行日: 1971/11/25
公開日: 2010/09/14
ジャーナル フリーGeomagnetic data from twelve stations have been analyzed for O1 lunar tidal variations by the Chapman-Miller method. Well-determined geomagnetic O1 tides were found in the vertical component at several stations. In most cases little or no solar modulation of the fundamental frequency of the O1(Z) tide was detected, thus making an ionospheric source for the O1(Z) tide unlikely. The most probable cause of the O1(Z) variation is electric currents induced in the oceans by O1 tidal currents. No definite conclusions could be drawn about O1 tides in the horizontal component of the field because of ambiguity between genuine O1 tides and seasonal changes in the M2 geomagnetic tide.抄録全体を表示PDF形式でダウンロード (1066K) -
R. K. Misra, H. Chandra, R. G. Rastogi1971 年 23 巻 2 号 p. 181-186
発行日: 1971/11/25
公開日: 2010/09/14
ジャーナル フリーThe E and F region apparent and true drifts over the equatorial station Thumba are studied for the period 1964-69 in relation to the solar activity. The apparent drift is found to reduce slightly while the true drift is reduced considerably, with the increasing solar activity. This result is interpreted by comparing the sensitivity factors for Ne and the solar daily range RH of the earth's magnetic field.抄録全体を表示PDF形式でダウンロード (545K) -
Masashi HAYAKAWA, Jinsuke OHTSU, Akira IWAI1971 年 23 巻 2 号 p. 187-204
発行日: 1971/11/25
公開日: 2010/09/14
ジャーナル フリーElectron-density variations in the magnetosphere at a geocentric distance of -1.50 earth radii are deduced from whistler dispersion data during one solar cycle from the year 1958 to 1968. The less sensitivity to the long-term variation of solar activity of the magnetosphere than the ionosphere was found. Also the variation of whistler dispersion at low latitude shows a semi-annual change, which will be discussed in comparison with the ionospheric f0F2 variation. Moreover, the characteristics of occurrence rate of low latitude whistlers are investigated with special reference to the solar-cycle and annual variations. These features on occurrence rate are explained in terms of ionospheric absorption, and duct formation.抄録全体を表示PDF形式でダウンロード (1674K) -
Takashi MURAYAMA1971 年 23 巻 2 号 p. 205-211
発行日: 1971/11/25
公開日: 2010/09/14
ジャーナル フリーSpatial distribution of energetic electron intensities as observed by a detector on the Imp-3 satellite has been examined in order to study the location of the high latitude boundary of the stably-trapped zone of energetic particles at the noon meridian section of the magnetosphere. A region of enhanced electron intensities was found to exist which extends from the equatorial region of the stably-trapped zone to high latitudes along the day-side magnetospheric boundary. The location of the region is in very good agreement with that of the high latitude part of the stably-trapped zone predicted by Shavansky and Antonova and which covers the region of off-equatorial magnetic field intensity minima in the day-side magnetosphere. Experimental data also suggest that almost continuous leakage of energetic electrons takes place toward the earth from this part of the trapping region.抄録全体を表示PDF形式でダウンロード (667K) -
J. C. Gupta, R. J. Stening1971 年 23 巻 2 号 p. 213-224
発行日: 1971/11/25
公開日: 2010/09/14
ジャーナル フリーThe period has been measured of each cycle of all Pc3, 4 micropulsation occurring on 10 days selected from a month's rapid run records collected during July-August, 1968 at four Canadian observatories. The periods are averaged over each hour and then the hourly values are averaged in two groups of five days according to the Cp value for the days. For Pc3 on the quieter days the diurnal variation of the periods shows a maximum peak near local noon while on disturbed days the variation changes to ‘U-type’ with the minimum period near noon. The Pc4 period is found to be lowest in the morning and highest in the evening at Ottawa and Meanook. But at higher latitudes (Baker Lake and Resolute Bay) the Pc4 period variation is simply ‘U-type’. Analysis also shows the presence of a diurnal variation of the correlation between Pc periods and Kp. The position of the plasmapause seems to determine Pc4 periods except at the higher latitudes while effects closer to the ionosphere may have a greater influence on the periods of Pc3 pulsations.抄録全体を表示PDF形式でダウンロード (1266K) -
Tadashi MUKAI1971 年 23 巻 2 号 p. 225-233
発行日: 1971/11/25
公開日: 2010/09/14
ジャーナル フリーThe plasma which flows into the contact region of two sunspots of opposite polarity (which is named “the neutral sheet”) induces an electric field. This induced electric field can accelerate a part of the charged particles. We show that the charged particle can reach an energy of a few Mev within a short time less than one second.
By comparing the energy gain from the induced electric field with the energy loss by the surrounding matter, it is shown that 0.046% of the surrounding protons in the neutral sheet can be accelerated to the high energy particles at kinetic temperature T0=105°K and density N=1012cm-3 of the surrounding matter.抄録全体を表示PDF形式でダウンロード (764K) -
Kenneth L. VEROSUB, Allan COX1971 年 23 巻 2 号 p. 235-242
発行日: 1971/11/25
公開日: 2010/09/14
ジャーナル フリーThe loss of magnetic energy accompanying the decrease in the earth's dipole field during the past 50 years has been shown by McDonald and Gunst to have been balanced by an equal increase in the energy of the nondipole field. It is shown that over time intervals of the order of 2000 years, conservation of the total magnetic energy stored outside the earth's core is not indicated by paleomagnetic measurements of ancient directions and intensities of the field. However during the past 120 years, a decrease in dipole energy at a rate of 5.1×1022ergs/year has been partly balanced by an increase in nondipole energy at a rate of 3.8×1022ergs/year. The net effect is a decrease in the total magnetic energy during the past 120 years at an annual rate of 0.01 percent, which is much less than the average rate during the past 1550 years inferred from paleomagnetic measurements.抄録全体を表示PDF形式でダウンロード (870K) -
Naoto KAWAI, Tadashi NAKAJIMA, Masayuki TORII, Kimio HIROOKA, Katsumi ...1971 年 23 巻 2 号 p. 243-248
発行日: 1971/11/25
公開日: 2010/09/14
ジャーナル フリーPDF形式でダウンロード (429K) -
B. N. Bhargava, A. Yacob1971 年 23 巻 2 号 p. 249-253
発行日: 1971/11/25
公開日: 2010/09/14
ジャーナル フリーPDF形式でダウンロード (445K)
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