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Volume 38, Issue 3
Displaying 1-4 of 4 articles from this issue
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S. OKANO, J. S. KIM1986 Volume 38 Issue 3 Pages 173-188
Published: 1986
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSNighttime thermospheric temperatures were derived from Doppler line profiles of the [OI] 630nm emission that were observed by using a 15-cm high-resolution Fabry-Perot interferometer at a field station near Albany (42.68°N, 73.82°W), New York.
The temperatures, obtained during magnetically quiet periods in May, June and July, 1978 when Kp≤2, are consistent with the exospheric temperatures calculated from the MSIS model. However, the temperatures measured during five geomagnetically disturbed periods showed large enhancements, as much as 750°K above the magnetically quiet day values.
Simultaneous examinations of our temperature data with the published daily graph of AL and AU indices and the plots of AL and AU contributing stations showed that (1) when the most intense portion of the westward AEJ is located at Great Whale River (GWC), which is in close proximity to the Albany meridian, observed temperature enhancement is large even if the intensity of the auroral electrojet (AEJ) is moderate, and that (2) when the most intense portion of the westward AEJ is located at Narssarssuaq (NAQ) or Leirvgor (LRV), which is far away from the Albany meridian, the required intensity of AEJ to produce similar temperature enhancement, as in the previous case, is much larger. It is also noted that there is a definite time lag of an order of one hour between the intensification of AEJ and the temperature rise. Temperatures measured in the middle of aurora did not show a significant enhancement, indicating that heating due to particle precipitation is not as effective as the Joule heating.View full abstractDownload PDF (1304K) -
A Possible Existence of the Nonthermal Atomic OxygenS. OKANO, J. S. KIM1986 Volume 38 Issue 3 Pages 189-200
Published: 1986
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSPhotometric and interferometric observations of the [OI] 630nm emission were made at a field station near Albany (42.68°N, 73.82°W), New York, and the thermospheric temperatures were derived from Doppler line profiles of this emission.
The [OI] 630nm profiles observed around 0700 UT on July 5, 1978, which showed the most increased “apparent temperatures”, could not be interpreted in terms of a single Gaussian source profile. Instead, a combination of two Gaussian source profiles satisfactorily explained the observed results. This, together with unusually high intensity at the time of the observation, suggests that the [OI] 630nm emission consisted of two different components, each being originated from a different source.View full abstractDownload PDF (922K) -
Masaru AYUKAWA, Takeo HIRASAWA, Kazuo MAKITA1986 Volume 38 Issue 3 Pages 201-220
Published: 1986
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSIn conjunction with the scientific program of the International Magnetospheric Study (IMS), an unmanned ground-based observatory was constructed in the inland of the Antarctic Continent about 150km south east of Syowa Station. Electric power source was supplied from batteries charged with a wind generator and it was maintained satisfactorily for more than 4 years during the period from 1977 to 1980. Several kind of instrumentations, fluxgate, induction magnetometer and riometer, were installed for the study of polar region phenomena.
On the basis of aurora and geomagnetic variations observed at Syowa, Mizuho and unmanned station (A1), it is found that small scale auroral electrojet currents really corresponded to auroral luminous regions and were able to be assumed as line currents.View full abstractDownload PDF (6403K) -
O. SAKA, H. TACHIHARA1986 Volume 38 Issue 3 Pages 221-230
Published: 1986
Released on J-STAGE: September 14, 2010
JOURNAL FREE ACCESSA compact data acquisition system in use for a geomagnetic pulsation study has been constructed. The system is composed of a data processing system controlled by a microprocessor, cassette tape recorder, chronometer and short wave radio receiver. The system is programmed to calibrate the chronometer every five minutes by receiving a standard time signal, such as JJY (Japan), WWV (USA) and so on. The system improves a signal to noise ratio of the radio waves by signal stacking processes to minimize errors in the chronometer calibration. Even in a very weak signal, the system can discriminate a second pulse. The calibration accuracy is 10msec, including circuit signal delay when a radio propagation delay is neglected. The system is programmed to sample three component magnetometer signals at intervals of 3 sec and can store 1.3 Mbytes of data in a C-90 cassette tape which is equivalent to ten-day data. The system is suited for an unmanned operation at a station remote from the standard signal station.View full abstractDownload PDF (2435K)
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