PWS (Plasma Wave Detector and Sounder) onboard the Akebono (EXOS-D) satellite has three sub-systems; i.e. i) a sub-system for natural plasma wave observations (NPW), ii) a sub-system for stimulated plasma wave experiments (SPW) and iii) the instrumentation for measurement of the number density of electron (NEI).

This dataset contains the waveforms of two electric field components (E1 and E2) and three magnetic field components (B1’, B2’, and B3’) of radio and plasma waves observed by NPW sub-system. Each waveform data consists of 50 data points sampled from IF signal with center frequency of 1 kHz and band width of 100 Hz, which are converted from 8 frequencies from 59 kHz to 1.3 MHz. The sampling frequency is 5 kHz. The directions of the five electromagnetic fields change depending on the time due to the spacecraft spin. So, some matrixes for conversion from antenna’s coordinate system to equatorial coordinate system are also provided in the same data file. As for usage of them, please check README-PY.pdf also.

Data Analysis

Here, you can find a TDAS load procedure file for PWS electric field intensity spectrum data. PWS electric field intensity spectrum data analysis becomes available on TDAS with this load procedure. TDAS (THEMIS Data Analysis Software suite) has been developed by THEMIS project. See TDAS web page for details.

If you have any questions or request for the data, please contact DARTS.

Request for using this data

In any publications, the use of the Akebono data should be acknowledged, for example,

“Akebono/PWS data were provided through DARTS at the Institute of Space and Astronautical Science, JAXA in Japan.”