======================================================================== NOTICE -- August 23, 2002 USAF SECONDARY Magnetometer Analysis Messages End The following products are no longer available: USAF Hourly Secondary Magnetometer Analysis USAF 24-Hour Secondary Magnetometer Analysis They were in the Latest Solar-Geophysical Data Directory (ftp ftp/pub/latest/) and Alerts, Forecasts, and Summaries -- USAF Magnetometer Analysis reports directoy (ftp ftp/pub/forecasts/MA) Only the SECONDARY station messages (MA2hr.txt and MA2da.txt) ended. The primary USAF Magnetometer Analysis messages (MAhr.txt and MAda.txt) will continue to be available. ======================================================================== USAF Magnetometer Analysis Report The USAF issues Hourly and 24-Hour (daily) reports containing geomagnetic A and K indices and maxiumum gamma deflections. The Space Environment Center makes these reports available on the internet via FTP and the World Wide Web. SEC updates the files as they are received, usually between 20 and 30 minutes past the hour. The most recent messages are available here and in the "Latest Solar-Geophysical Data" directory (/pub/latest/). There are hourly and daily messages in the SEC files MAhr.txt and MAda.txt -- described below. The USAF message headers are AXXX51 KHMN and AXXX52 KHMN (previously HMUS1 KSFC and HMUS2 KSFC) From 1997 until August 23, 2002 a second set of stations, in files named MA2hr.txt and MA2da.txt, were also available. In this directory: o the most recent messages (MAhr.txt, MAda.txt) o the last 48 hourly messages (oldMAhr.txt) o the last 7 daily messages (oldMAda.txt) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Product Description From Air Force Catalog 15-152, Volume 5, 7 November 1994 2.15. HMUS1 KSFC (Magnetometer Analysis). 2.15.1. Description. This bulletin describes the geomagnetic field's current state and summarizes geomagnetic indices observed during the previous seven hours. It contains local 60-minute variations in the geomagnetic field (maximum gamma deflections and corresponding 1-hour K-indices) reported by the listed US Geological Survey (USGS) magnetometer sites. (NOTE: The USGS stations have a temporal resolution of one-minute.) The bulletin also lists several indices derived from these local variations: the 3-hour ap (and corresponding 3-hour Kp) index, as well as the 12 and 24-hour running mean of the Ap index. Compatibility with world-standard Goettingen, Germany, indices is achieved by computing values at the synoptic hours (03Z, 06Z, 09Z, ..., and 24Z). The indices computed between the synoptic hours are estimates (or projections) of what the indices will be at the next synoptic hour. 2.15.2. Transmission Times. No later than 0030Z, plus every 60 minutes. 2.15.3. Format (see Figure 2.15.). Computer generated plain language bulletin. An asterisk indicates missing data. ************************************************************** Figure 2.15. Example HMUS1 message. ************************************************************** MAGNETOMETER ANALYSIS FOR 09/1900 HOURLY MAX GAMMA DEFLECTIONS/K INDICES 12-13 13-14 14-15 15-16 16-17 17-18 18-19 MEANOOK 38/2 133/4 86/3 22/1 62/3 44/2 35/2 SITKA 31/2 129/4 79/3 20/2 25/2 36/2 35/2 OTTAWA 30/3 51/3 37/3 34/3 32/3 19/2 32/3 SAINT JOHNS 31/3 39/3 28/2 21/2 21/2 18/2 31/3 NEWPORT 22/2 36/3 42/3 24/2 51/3 28/3 20/2 FREDERICKSBURG 34/3 51/4 26/3 18/2 26/3 11/2 20/2 BOULDER 14/2 50/4 45/4 34/3 50/4 20/3 16/2 HARTLAND 34/3 46/4 24/3 37/3 30/3 29/3 20/3 FRESNO 14/2 27/3 11/2 30/4 36/4 15/3 11/2 12-13 12-14 12-15 15-16 15-17 15-18 18-19 3-HOUR AP 10# 26# 30 11# 15# 19 9# 3-HOUR KP 2P# 4Z# 4Z 3M# 3Z# 3P 2Z# 12-HOUR AP 8# 12# 12 13# 14# 15 15# 24-HOUR AP 10# 13# 13 13# 13# 13 12# #SYNOPTIC VALUE ESTIMATED FROM AVAILABLE DATA 12-13 13-14 14-15 15-16 16-17 17-18 18-19 1-HOUR KP 2P 4M 3M 3M 3Z 2P 2Z 10-13 11-14 12-15 13-16 14-17 15-18 16-19 RUN 3-HOUR AP 14 26 30 28 20 19 19 RUN 3-HOUR KP 3M 4Z 4Z 4Z 4M 3P 3P 99999 2.16. HMUS2 KSFC (Daily Magnetometer Analysis). 2.16.1. Description. This bulletin contains a summary of geomagnetic field conditions observed during the previous 24 hours. The bulletin contains local 3-hour variations in the geomagnetic field (gamma deflections and 3-hour K-indices) at synoptic hours (03Z, 06Z, 09Z, ..., and 24Z). Although this bulletin basically summarizes data previously reported in the day's HMUS1 KSFC bulletins, the values listed are final values in the sense that missing, late, or corrected data have been included. 2.16.2. Transmission Times. Once daily near 0115Z via AUTODIN and the AWN. 2.16.3. Format (see Figure 2.16.). Computer generated plain language bulletin. An asterisk indicates missing data. ************************************************************* Figure 2.16. Example HMUS2 message. ************************************************************* MAGNETOMETER ANALYSIS FOR 08 AUG 02 24 HOUR SUMMARY OF 3-HOURLY MAX GAMMA DEFLECTIONS/K INDICES 00-03 03-06 06-09 09-12 12-15 15-18 18-21 21-00 MEANOOK 15/1 10/0 5/0 7/0 19/1 27/1 24/1 35/2 SITKA 22/2 18/1 5/0 7/0 11/1 17/1 20/1 16/1 OTTAWA 5/0 7/0 5/0 13/1 10/1 9/1 21/2 28/2 SAINT JOHNS 11/1 5/0 8/1 12/1 9/1 10/1 22/2 19/2 NEWPORT 11/1 12/1 4/0 6/0 13/1 15/2 20/2 21/2 FREDERICKSBU 7/1 7/1 6/1 17/2 9/1 6/1 15/2 13/2 BOULDER 7/1 11/2 4/0 6/1 17/2 17/2 12/2 20/2 HARTLAND 8/1 8/1 14/2 25/3 15/2 13/2 9/1 24/3 FRESNO 20/3 8/2 4/1 7/1 14/3 16/3 10/2 10/2 3-HOUR AP 8 11 4 7 13 11 18 15 3-HOUR KP 2Z 3M 1M 2M 3M 3M 3P 3Z 24-HOUR AP 8 8 7 7 8 8 9 10 99999