Plasma Wave and Sounder (PWS)
PWS (plasma waves and sounder experiments) 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). The electric field intensity spectrum data of 2 seconds
time resolution observed by NPW sub-systeme are open to the public for
All the files from 1989 are available,
Each data point consists of 512 electric field intensity at a given
frequency with the band width of 1kHz. The frequency variation in
each data block is given with linear function of corresponding step number.
- data block 1 : 20kHz - 140 kHz
- data block 2 : 140kHz - 380 kHz
- data block 3 : 380kHz - 1340 kHz
- data block 4 : 1340kHz - 5120 kHz
The data files are provided in the CDF format. Please check the
descriptions in each data file before use.
For effective utilization of PWS data and responsible publication,
the user is requested to refer to Oya et al.  for further detail
specification and descriptions on PWS experiments.
TDAS load procedure
Here, you can find a TDAS load procedure
file for PWS data. PWS data analysis becomes available on TDAS with
this load procedure. TDAS (THEMIS Data Analysis Software suite) has
been developed by THEMIS project.
web page for details.
Data Policy and Credits
In order to confirm the reliability of the data, you are requested to
contact the PWS data manager, Dr. Atsushi Kumamoto at Tohoku University
before using the PWS data in oral/poster presentations. In the publishment,
You should contact to the PWS data manager, Dr. Atsushi Kumamoto at
Tohoku University before the submission for the confirmation of the
principle of authorship/acknowledgement. You are also requested to send
reprints to the PWS Data manager.
In any publications, the use of the Akebono/PWS data should also be
acknowledged, for example, as "The Akebono/PWS data were provided through
DARTS at Institute of Space and Astronautical Science, JAXA."
- Dr. Atsushi Kumamoto
- Tohoku University
Aoba, Aramaki, Aoba-ku, Sendai, 980-8578, Japan.
kumamoto AT pparc.gp.tohoku.ac.jp
Oya, H, A. Morioka, K. Kobayashi, M. Iizima, T. Ono, H. Miyaoka, T. Okada
and T. Obara, Plasma wave observation and sounder experiments (PWS) using
the Akebono (EXOS-D) satellite - Instrumentation and initial results
including discovery of the high altitude equatorial plasma turbulence,
J. Geomag. Geoelectr., 42, 411, doi:10.5636/jgg.42.411, 1990.
Tsuruda, K., and H. Oya, Introduction to the EXOS-D (Akebono) Project,
Geophys. Res. Lett., 18(2), 293-295, doi:10.1029/91GL00039, 1991.