Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa52a0393a&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SA52A-0393
Physics
2407 Auroral Ionosphere (2704), 2419 Ion Chemistry And Composition (0335), 2443 Midlatitude Ionosphere, 2704 Auroral Phenomena (2407)
Scientific paper
In the SEEK-2 (Sporadic-E Experiment over Kyushu) campaign, two rockets (S-310-31, 32) were launched in succession with an interval of 15 minutes from Uchinoura, Kagoshima on August 3, 2002. To observe waves and winds of neutral atmosphere, the S-310-32 rocket released trimethyl aluminum (TMA) over the altitude range from about 80 km to the apex of 117 km. We operated an all-sky imager and an image-intensified CCD (II-CCD) camera for ground-based imaging observation. During TMA release, the all-sky imager measured 557.7-nm emission with an exposure time of 40 seconds, while the II-CCD camera measured the rapid development of TMA release with a standard video frame rate and a narrow field of view of 10 ° x 15 °. Using these instruments, we succeeded in observing TMA-induced artificial aurora. Gelinas et al. [JGR, 21495, 2001] studied TMA-induced emission and found following characteristics: 1) the emission lasts a few seconds, 2) the emission is emitted when kerosene is mixed with TMA, 3) the emission appears only during downleg release although TMA is released during both upleg and downleg, and 4) the emission appears along the magnetic field lines through the rocket trajectory. From the present II-CCD camera images, it is found that artificial aurora appeared above about 100 km altitude, and continuously from upleg release to downleg release and lasting at least more than one minute. According to an eyewitness report, artificial aurora had a ray structure below TMA trails as if it occurred along magnetic field lines. One of important characteristics is that the artificial aurora remained at a fixed location, though TMA trails moved due to background neutral atmosphere wind. The artificial aurora was green according to eyewitness, and we confirmed it by the all-sky imager with a 557.7-nm filter. However the all-sky imager of Nagoya University also confirmed the existence of OI 630.0-nm and OH emissions. On the ground, all-sky imagers were operated at 4 sites with separations more than 60 km. These multi-site data enabled us to investigate the 3-dimensional structure of the artificial aurora and its evolution. Further, on the same S-310-32 rocket, the plasma wave instrument was also loaded. We will compare the optical data with the plasma wave data obtained from this instrument to investigate the excitation mechanism of the artificial aurora.
Arakawa Masahiko
Fukao Shoichiro
Fukunishi Hiroshi
Gelinas Lynette Jean
Larsen Mark F.
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