FAST Data - AKR Fine Structure

This page provides a link to online PDF files. Adobe Acrobat Reader is needed to view these files.

The data shown in the plots have been made available for viewing for information purposes only.
Please e-mail if you would like to use these data.

Example plot

Example showing the format of the data plots.

Each file contains four panels of data. The top panel shows electric field data from the SFA channels. These data place the data from the Plasma Wave Tracker (PWT) in context. The two reference lines shown are the electron gyro-frequency from the model (IGRF) field, and the center frequency of the PWT. Usually the PWT center frequency is the higher of the two.

The second panel shows data from the PWT. The PWT is sampled at 32768 samples per second (16 kHz Nyquist frequency). The plot shows 4 spectrum overlapped averages of Fast Fourier Transforms of the waveform data. These spectra have 64 Hz frequency resolution. The 2.5 second modulation in these data is due to the spin of the spacecraft (5 second period). The reference line, when shown, is the electron gyro-frequency from the model field. If this frequency lies within the PWT band, then the spacecraft is in or near the AKR source region.

The third panel shows that PWT data rescaled to the maximum in each sprectrum. This draws out the fine structure, especially for the weaker signals.

The bottom panel shows the maximum intensity for each spectrum shown in the third panel. When assessing the relevance of fine structure to AKR processes it is important to take into account the intensity of the signals, as well as their frequency content.

The following link points to the on-line directory of PDF files.
Online AKR fine structure

The official web-site for browsing FAST data is

FAST related links

FAST home page at NASA/Goddard Space Flight Center

FAST home page at Space Science Laboratory - U.C. Berkeley

FAST magnetometer home page at UCLA

Data from the FAST spacecraft - Fields instruments

Robert J. Strangeway
Institute of Geophysics and Planetary Physics / UCLA
Los Angeles, CA 90024-1567
Telephone: (310) 206-6247
FAX: (310) 206-3051
Internet e-mail:

IGPP/SSC home page     FAST Magnetometer home page     Bob Strangeway's home page

Last modified: December 18th, 1998.