The appearance of RISING-2 is shown in Fig.1. The primary mission is the earth observation with a resolution of 5 meters by using a Cassegrain reflector telescope which diameter is about 10 cm and the focus distance is about 1 meter. The visible infrared and multi spectral images of cumulonimbus clouds can be observed by using a liquid crystal tunable filter (LCTF) as well as usual color images.

Continuously observing the cloud images with an interval of about 10ms, the detail structure of cumulonimbus clouds can be constructed. This resolution is higher than images obtained by conventional satellites such as TRMM, which have 2-km resolution, and ground radar observatories. These observations are expected to solve a mechanism of guerrilla heavy rain and contribute to the establishment of basic technology for weather forecasting. The RISING-2 also observes the horizontal structure of sprite which is one of lightning discharge phenomena.

The RISING-2 can observe the designated position around the earth by using the three-axis attitude control system which consists of reaction wheels, star sensors and gyro sensors. The almost instruments of attitude control system including a central control unit, attitude sensors and wheels are newly developed in this project. The fine pointing control using wheels, gyro, and star sensors is carried out for 15 minutes in sunshine and 15 minutes in eclipse each.

Fig.1 Apperance image of RISING-2

(C) The Space Robotics Lab (Space Exploration Lab), Tohoku University
Last-modified: 2011-06-16 (Thu) 08:15:38 (3395d)