Here's What's New re GOES SEM data

October 22, 2012 GOES-15 data from both SEM and SXI ceased to flow in the UT afternoon. GOES-14 and GOES-15 will be off and on for a month or so -- the exact schedule is proprietary.
Useful websites displaying GOES data: Lockheed Martin Solar & Astrophysics Laboratory: Latest Events

RHESSI Science Team at Berkeley: Plots, Nuggets

GOES Greatest Hits

Venus

See some of the best stuff that GOES has to offer in the Greatest Hits page.

Big stuff, new stuff, old stuff, cool stuff, come one come all.

GOES SEM Web Services

Venus

Below are some web service examples for retrieving the GOES data used in these displays: stack plot of the March 2012 event or 108-day plot showing the big picture.

ENERGETIC PARTICLES: http://www.ngdc.noaa.gov/goes/sem/getData/goes15/epead_cpflux_5m.csv?fromDate=20120304&toDate=20120317
ENERGETIC PARTICLE Data Attributes: http://www.ngdc.noaa.gov/goes/sem/getMetadata/goes15/epead_cpflux_5m.csv

X-RAYS: http://www.ngdc.noaa.gov/goes/sem/getData/goes15/xrs_1m.csv?fromDate=20120304&toDate=20120317
X-RAY Data Attributes: http://www.ngdc.noaa.gov/goes/sem/getMetadata/goes15/xrs_1m.csv

MAGNETOMETER: http://www.ngdc.noaa.gov/goes/sem/getData/goes15/magneto_1m.csv?fromDate=20120304&toDate=20120317
MAGNETOMETER Data Attributes: http://www.ngdc.noaa.gov/goes/sem/getMetadata/goes15/magneto_1m.csv

SOLAR X-RAY IMAGES: http://www.ngdc.noaa.gov/goes/sxi/getImageURL/goes15/level1.html?fromDate=20120307000000&toDate=20120307015959&imgFormat=png

LONGITUDES:
http://www.ngdc.noaa.gov/goes/sem/getLocationdata/goes15.csv?fromDate=20120301&toDate=20120331

This interface doesn't yet support the earlier satellites, in the mean time this file may help: GoesLongitudes_1986-2012.csv

Webservice documentation.

If you prefer internally documented CSV and NetCDF files you can generate them via this webservice or you can simply go here.