Active Experiments of Wave-Wave and Wave-Particle Interaction by Using EXOS-D (AKEBONO) Satellite

这个项目的主要目标是利用我们的卫星Akebono与美国加州大学洛杉矶分校运营的位于阿拉斯加费尔班克斯附近的电离层加热设施HIPAS(高功率主动刺激)进行合作考察，以及与美国科学卫星DE-1进行另一项合作实验。在这两年中，我们通过HEPAS实验取得了成功的结果，但由于卫星的几个意外情况，DE-1计划未能取得丰硕成果。在1990年下半年，我们还与挪威特罗姆索附近的电离层加热设施进行了合作实验。HIPAS是一台用于加热电离层的高功率短波无线电发射机(2.85 MHz和1 mW)。我们已经用甚低频频率调制了高频无线电波。结果是，甚低频频率的电离层电流在加热的电离层中流动，向上和向下辐射甚低频无线电波。我们试图通过使用我们的卫星Akebono和地面上的接收器来观测这个VLF无线电波。1989年8月，我们在距HIPAS 35公里的地面上成功地探测到了与HIPAS电离层加热有关的VLF信号。卫星观测没有成功。我们在1989年11月28日和1990年6月18日分别在海拔2300公里和10000公里的高空成功探测到了这个VLF信号。1990年11月，我们与挪威的特罗姆索电离层加热设施进行了类似的合作实验。11月18日的实验在1200公里的卫星高度上取得了成功。如上所述，我们的联合实验是令人满意的，以澄清来自加热的电离层的甚低频波辐射的机制以及传播到空间和地面的模式。

Main objectives of this project were to do colaborative expeiments with an ionospheric heating facility HIPAS (High power active stimulation) near Fairbanks, Alaska, which is operated by UCLA, using our satellite Akebono, and another colaborative experiment with the U. S. scientific satellite DE-1.During these two years, we have been able to achieve successful results by the HEPAS experiments, but not able to get fruitful result by the DE-1 project, due to several unexpected situations of the satellites. During the last half year in 1990, we also made colaborative experiments with an ionospheric heating facility near Tromso in Norway.HIPAS is a high power HF radio transmitter (2.85 MHz and 1 MW) to heat the ionosphere. We have modulated the HF radio wave with a VLF frequency. As the result, an ionospheric current of the VLF frequency flows in the heated ionosphere, which radiates a VLF radio wave upwards and downwards. We have tried to observe this VLF radio wave by using our satellite Akebono and a receiver on the ground. In August, 1989, we succeeded to detect the VLF signal associated with HIPAS ionospheric heating on the ground by a VLF receiver 35 km away from the HIPAS. Satellite observations were not successful. We could successfully detect this VLF signal with Akebono at 2,300 km of altitude on November 28, 1989 and at 10,000 km on June 18, 1990 as well as on the ground.In November, 1990, we have made similar colaborative experiments with the Tromso ionospheric heating facility in Norway. The experiment on November 18 was successful for a satellite altitude of 1,200 km. As mentioned above, our joint experiments were satisfactory, in order to clarify the mechanism of VLF wave radiation from the heated ionosphere and the mode of propagation to the space and to the ground.