LET Data and Plots

LET Data Documentation, Caveats, Notes

April 3, 2013: Important Update: Due to incorrect calculation of instrument livetimes in ground data processing, LET intensities at the peak of the July 23 2012 event were inaccurate. We have corrected the livetime calculation, and a new version of the data has been released - Version 11.

Time-series Plots

Monthly Plots 27-day Plots

ASCII Data Files

Note: LET 1-Minute data in CDF format are available from the IMPACT Level 1 Data site at Berkeley SSL, and from CDAWeb.

Usually, the data for month N will be validated and released during the first week of month N+2.

Event Lists, and Days of Elevated Intensity

Proton intensities, spectral indices, and plots for days when the LET daily averaged intensity of 10-15 MeV protons exceeded 1x10^-4 (cm²-sr-sec-MeV)^-1.

LET Behind LET Ahead

Preliminary SEP and CIR event lists, and corresponding plots, based on 3-hour averaged 1.8-3.6 MeV proton rate

Warning: The event lists and plots are an ongoing work-in-progress, and subject to change.

Proton Anisotropy Plots and Movies

Yearly browse plots of LET 4-6 MeV proton sectored rates; see the user's guide for more details.

Behind Ahead
CAUTION: Spacecraft orientation may affect what you see in these plots. See "View Direction Movies" (below), or these plots showing the spacecraft roll angle.

Anisotropy movies for STEREO LET H 4-6 MeV sectored intensities. See the user's guide for more details.

Behind Ahead

View Direction Movies

Behind Ahead

The LET instrument has 16 viewing aperatures and in these Quicktime movies the boresights of these 16 sectors are shown in the RTN coordinate system. While these movies were specifically designed for LET, they can be used by anyone wishing to know something about the orientation of the spacecraft as a function of time. See the user's guide for more details.