Occurrence condition and the mechanisms are still remain a mystery such as the causes of discharge type differences of columns or carrots, vertical occurrence location gap between a thunder and a sprite, and factors that determine the number of sprite discharge(s). Upper-atmospheric lightning was discovered about 20 years ago. JEM-GLIMS aims to observe the lightning that occurs at an altitude of 10 km or below and the upper-atmospheric lightning such as sprites, elves, and gigantic jets that occur at altitudes between 20-90 km in connection with the lightning. Yellow square shows the field of the CMOS camera while the red circle shows the field of the photometer. The lightning was captured over Malaysia. ISS location when captured the lightning See also: JEM GLIMS website by Hokkaido University Supplemental reading Observation data by JEM-GLIMS I expect to obtain important findings in the near future. This first observation proved the equipment was working normally, and interesting data was included in the obtained data. I'd like to express my gratitude to all the concerned people. It was launched this July without trouble. JEM-GLIMS experiment was chosen as one of the JAXA's port sharing utilization mission onboard Kibo-Exposed Facility of the ISS. 【Remarks from PI, Tomoo Ushio, Associate Professor, Osaka University】 In addition, in collaboration with the researchers from around the world, we are planning to carry out a simultaneous observation of an upper-atmospheric luminous event using a ground-based optical observation instrument and this JEM-GLIMS. In addition, by a comparison with the observational data of lightning obtained on the ground, we will clarify the electrical characteristics of lightning that caused upper-atmospheric luminous phenomena. Research teams and JAXA will conduct the continuous observation and aims to detect the luminous phenomena, such as sprites. This example of observation is a data before it is validated. As such, JEM-GLIMS conducts the world's first, just-above observation of lightning and TLE in the upper-atmosphere. The data will be validated in near future. For this reason, detection of near-ultraviolet ray suggests that the occurrence of a transient luminous event (TLE) in the upper-atmosphere. The light of near-ultraviolet ray is mostly absorbed to the ozone in the atmosphere and rarely reaches the ISS flying at 400km altitude. In addition, a strong light of near-ultraviolet ray has been detected with a wavelength of 150-280nm. From the figure, the lightning emissions show a non-uniform, complicated spatial distribution of an approximately 20km wide.
The figure below is an image data captured by the CMOS camera of a just below, a lightning that occurred over Malaysia, which JEM-GLIMS observed at 11:51 p.m. Initial checkout of each instrument of JEM-GLIMS was completed and the observation equipment had been verified working normally. Further, since the just-above observation from space receives little impact from absorption and scattering by the Earth's atmosphere, it is possible to acquire precise data of the luminescence intensity. JEM-GLIMS, composed of a CMOS camera with high spatial resolution, photometers with high temporal resolution, and VLF/VHF radio wave receivers, lead the world in the continuous observation of the lightning and sprites from just above.īy doing the just-above observations, a detailed study for the horizontal spatial distribution and temporal development process of lightning and sprites which has been difficult to derive from the on-ground observation data becomes possible. JEM-GLIMS was collaboratively developed by Osaka University, Hokkaido University, Kinki University, Stanford University, National Institute of Polar Research, Osaka Prefecture University, Tohoku University, the University of Electro-Communications and JAXA.
After the installation, JEM-GLIMS successfully obtained its first observation data. JEM-GLIMS was launched to the ISS on July 21, 2012, aboard the H-II Transfer Vehicle (HTV) KOUNOTORI3 and installed on the Exposed Facility (EF) of Kibo on August 9. Global Lightning and sprIte MeasurementS on JEM-EF (JEM-GLIMS) is the equipment onboard the Multi-mission Consolidated Equipment (MCE), installed on the Exposed Facility (EF) of the Japanese Experiment Module Kibo on the International Space Station (ISS).
0 kommentar(er)
