See http://sec.noaa.gov/Data/ for tables of all online data at SEC, including links to non-SEC sources for older data. ACE data lists http://sec.noaa.gov/ftpmenu/lists/ace.html (1- and 5-min data) http://sec.noaa.gov/ftpmenu/lists/ace2.html (Hourly data and Sat. Location) ============================================================================= March 5, 2002 EPAM Data Processing Change On March 18, 2002 EPAM data processing will be updated. On data lists, the header line changes to show the new energy range for the first Proton channel. On data plots (http://sec.noaa.gov/ace/), the legend changes. EPAM data processing update: In late November and early December 2001 the P1 channel (47 to 65 keV) data increased during an energetic particle event (small radiation storm) and never returned to nominal levels. The channel became "noisy" and after monitoring for a few weeks the decision was made to replace the P1 channel with the P2 channel (65 to 112 keV) data, the next higher energy channel within the same detector on EPAM. During the later part of December 2001 the P5 channel (310 to 580 keV) showed anomalous periods of increased particle flux. The instrument PI from JHU/APL determined that when the detector was pointed in the general direction of the sun, the sector pointed toward the sun showed large increases in particle flux. This is believed to be due to solar contamination and only happens during limited times between each set of spacecraft maneuvers. The decision was to change the processing of all channels from this detector to eliminate the solar noise problem. A third problem was induced by the solar noise problem: Whenever the P5 channel became noisy the P1 and P3 data would drop out. The cause of the drop out was a programming filter designed to eliminate "bad" data. Since not all of the data were "bad", only the sunward directed sector, a decision was made to eliminate all data from the sunward sector. Problems two and three were solved by the removal of the data from the sunward sectors for all channels. The only impact from removing the sunward sector data is larger fluctuations in the data when the flux is near background levels. ======================================================================== March 4, 2001 ACE Tracking Reduced and EPAM P1 Channel change RAL will not be tracking for 3 weeks starting March 5 while their antenna is upgraded. EPAM lowest energy channel (P1) 47-65 keV data are suspect since late November. The channel will be replaced by March. ======================================================================== December 20, 2001 ACE EPAM P1 Channel Data Suspect Data from the ACE EPAM lowest energy channel (P1) 47-65 keV are suspect since late November, following the large proton event that ended on the 24th. The cause and possible cure are being investigated by the instrument team and SEC. Look for further messages here as more information becomes available. ======================================================================== November 26, 2001 ACE SOLAR WIND DATA CONTAMINATION ENDS The solar energetic proton event that contaminated the ACE SWEPAM instrument data resulting in incorrect solar wind density, speed, and temperature values being reported by SEC on November 23 and 24 ended November 24 about 1800 UTC. To review this event see http://www.sec.noaa.gov/ftpmenu/plots/proton.html ======================================================================== November 7, 2001 ACE SOLAR WIND DATA CONTAMINATION ENDS A solar energetic proton event contaminated the ACE SWEPAM instrument data resulting in incorrect solar wind density, speed, and temperature values being reported by SEC on November 5 and 6. The contamination ended November 7 about 0300 UTC. To monitor this event see http://sec.noaa.gov/rt_plots/pro_3d.html ================================================================== July 30, 1998 ACE Hourly Averaged data SEC creates monthly files of hourly averaged data from each of the ACE instruments. The files are updated every 3 hours beginning at 0010UT. The current month's files are recreated at each run. The previous month's files is created for the last time on the first day of the new month. ========================================== Notice July 26, 2000: ACE EPAM Data Lists Header Line Changes The ACE EPAM hourly-averaged data lists, which had incorrect Differential Proton Flux ranges in the header lines, were changed beginning with the July 2000 file. CORRECTED: # -- Differential Flux -------------------------- # UT Date Time ------------------ Protons keV ---------------- # YR MO DA HHMM 47-65 112-187 310-580 761-1220 1060-1910 INCORRECT: # -- Differential Flux -------------------------- # UT Date Time ------------------ Protons keV ---------------- # YR MO DA HHMM 56-78 130-214 337-594 761-1220 1073-1802 ========================================== Spacecraft Location List SEC uses predicted ACE spacecraft location information to create a monthly list of hourly predicted locations. http://sec.noaa.gov/ftpmenu/lists/ace2.html The current month's list is recreated once a day at 0012UT. It contains values from the 1st of the month through hour 23 of the current day. The hourly predicted location values are X, Y, and Z position in GSE coordinates, with an accuracy 0.1 earth radii (about 600 km). For a complete description of the ACE data see the README file (About the menu option) in the ACE 1- and 5-min data lists directory: ftp://sec.noaa.gov:70/11/lists/ace ftp://sec.noaa.gov:70/11/lists/ace2 SEC ftp directory /lists/ace/README SEC ftp directory /lists/ace2/README