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The explosive growth of lean satellites (small/micro/nano/pico) has positioned this class of satellites as a unique tool for space science missions. Langmuir probe is one of the most frequently used payloads to achieve space plasma measurement missions because of their low requirement in terms of system development, size, and relatively low power requirements to drive the mission. Double Langmuir probe can overcome the limitations of a single Langmuir probe measurement as reference ground in the satellite is not required. The limitation of data communication speed is one of the problems that always occur in the development of a multi-mission lean satellite. Data communication speed can be improved by using another system such as S-band or X-band, but those will be required for high power consumption. One of the solutions is the reduced size of the data by using on-board data processing on satellites. On-board data processing aims to improve data communication speed when sending DLP data to ground stations and how to determine plasma parameters. On-board data processing for a double Langmuir probe will be calculated electron temperature and electron density by using Raspberry PI zero. On-board data processing aims to reduce the size of data so that the time of transmission between satellite and ground stations will be shorter. On-board data processing can be a pragmatic solution because processed data only contains useful information according to user requirements.

Abstract. Space Science Center of Indonesian Institute of Aeronautics and Space called LAPAN has installed several solar radio receivers named CALLISTO in various parts of Indonesia. The equipment has made some solar radio observational data which is indicate solar radio burst since its operation. All of the observational data stored in the file format of Flexible

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The Ionosphere layer can influence radio wave propagation from one place to another place with a very long distance on the Earth and between satellites to the receiver. Each ionosphere layer has different characteristics and the presence of the ionosphere changes daily according to solar activity. The D layer is the innermost ionosphere layer, starting about 60 - 95 km above the Earth’s surface. Observation of the D layer cannot be carried out by balloon, ionosonde, and satellite because it is too low so that continuous observation is very difficult. VLF/LF radio web can be traveled hundreds to thousands of kilometers from the transmitter with multiple reflections between the earth and the ionosphere that is known as the Earth-Ionosphere WaveGuide (EIWG). VLF/LF receiver is an instrument that can be used to observe changes in the low region ionosphere layer due to solar activities.