ERRATA.TXT lists known problems and anomalies in the data on this and previous volumes. The most up-to-date version of this file is available online at: http://www-pw.physics.uiowa.edu/cluster/dvd/ERRATA.TXT For issues relating to the interpretation of WBD data, please see the Cluster Interpretation Issues web page, available at: http://www-pw.physics.uiowa.edu/cluster/interpretation_issues/ and also at the Cluster Active Archive (http://caa.estec.esa.int/caa/). 1. Known Cluster 2 Problems WBD data received from Baikonour tests just prior to launch in 2000 revealed various problems with the WBD transfer frames that most likely originate in the Cluster Onboard Data Handling System (OBDH) on Cluster 2 only. Because these problems were discovered so late, it was not possible to do further diagnostics and correct the problems since it was felt that most of the problems could be worked around in ground processing. The following are the problems that were identified and how they are handled in LEVEL1 processing: (a) Instrument Counter Values The WBD instrument has a counter which is reset every 5.15 seconds. On Spacecraft 2, the value of this counter is not always read out correctly after a reset, resulting in an incorrect counter value being placed in the data record. After processing, these incorrect values remain in the level one files, although any errors they might have introduced into the time stamp calculations have been corrected. (b) Science Data Errors When a science data point on spacecraft 2 has a value of 80 (hexadecimal), the following data point will sometimes have an invalid, but predictable, value. Iowa replaces the invalid value with the value 255 to signify that the value is bad and not deterministic. We provide a simple procedure which replaces the apparently incorrect value with the average of the two adjacent values (see FIX_SC2.C in the SOFTWARE/CLU2_FIX directory). This procedure should be run before any calibrations are applied. (c) WBD Status Errors Occasionally, any one of the WBD status bits can be corrupted. These status bits provide information about the mode and gain state of the instrument. Iowa corrects the decommutated status bits written into the level 1 files when this status bit is a mode bit, such as antenna being used, bandwidth, and conversion frequency, but does not correct it when it is a gain state bit because it is difficult to determine what the correct gain state should have been. Because the calibration for the WBD data depends on knowing the correct gain state, the calibration that is applied to a frame with an errant gain state will be incorrect. This is usually apparent as a more or less intense frame slice compared to those on either side of it in the 30 second spectrograms (gifs) that are produced for every pass (note, however, that a gain state error is certainly not the only possible cause of such an artifact on the spectrograms). 2. Software and document updates 2004-02-16: In SOFTWARE/EXAMPLES, the files CLOG.C, R_WBD_WF.C, WBDL1LIST.C, and MAKEFILE were updated. The corresponding executables in the SOFTWARE/EXAMPLES/BIN/* directories were also replaced. These updates will appear on volumes after WBD_20010624_30_A. 2004-03-10: In SOFTWARE/CLU2_FIX, the file FIX_SC2.C was updated to accomodate the case where the "bad" data value had been set to 255. 2004-06-07: SOFTWARE/EXAMPLES/WBDL1.H macro named WBD_OBT_CTIB_subsec(p) was corrected. The Level 1 generation program put the 20-bit value in bytes 1253-1255 instead of 1252-1254 and the macro was modified to accomodate the error. The format documents, test output files, and executable binary programs have also been updated to conform. Our thanks to Jan Soucek for identifying this problem. 2006-07-12: INSTDESC.TXT and WBFORMAT.TXT were updated with more precise conversion frequency values. The R_WBD_WF.C example was updated to open the highest available version data file. CALIBRATE.C was updated to include conversion of B-antenna data to nT. The following files were updated: SOFTWARE/EXAMPLES/EX_README.TXT SOFTWARE/EXAMPLES/R_WBD_WF.C SOFTWARE/EXAMPLES/BIN/LINUX_INTEL_FEDORACORE5/CLOG SOFTWARE/EXAMPLES/BIN/LINUX_INTEL_FEDORACORE5/R_WBD_WF SOFTWARE/EXAMPLES/BIN/LINUX_INTEL_FEDORACORE5/WBDL1LIST SOFTWARE/EXAMPLES/BIN/SUN_SPARC_SOLARIS7/R_WBD_WF SOFTWARE/EXAMPLES/BIN/WINDOWS_INTEL_CYGWIN/CLOG.EXE SOFTWARE/EXAMPLES/BIN/WINDOWS_INTEL_CYGWIN/CYGWIN1.DLL SOFTWARE/EXAMPLES/BIN/WINDOWS_INTEL_CYGWIN/DIFF.EXE SOFTWARE/EXAMPLES/BIN/WINDOWS_INTEL_CYGWIN/DOS2UNIX.EXE SOFTWARE/EXAMPLES/BIN/WINDOWS_INTEL_CYGWIN/MD5SUM.EXE SOFTWARE/EXAMPLES/BIN/WINDOWS_INTEL_CYGWIN/R_WBD_WF.EXE SOFTWARE/EXAMPLES/BIN/WINDOWS_INTEL_CYGWIN/UNIX2DOS.EXE SOFTWARE/EXAMPLES/BIN/WINDOWS_INTEL_CYGWIN/WBDL1LIST.EXE 2006-08-16: All documentation was revised before final submission to the Cluster Active Archive (CAA). These revisions were carried out primarily to make the wording in the documentation more clear and concise and to provide a more expanded explanation of various problems and of the time stamps (TIMES.TXT renamed TIMETAGS.TXT) contained in the level 1 files. The documents that were revised are: ERRATA.TXT INSTDESC.TXT README.TXT TIMETAGS.TXT (previously named TIMES.TXT) WBFORMAT.TXT 2007-04-26: Example software was updated to handle burst mode data and correct minor bugs. The BIN directory with executable code was removed. Documents were updated with additions for burst mode and corrections for the software changes. Note that the previous WBFORMAT.TXT does not accurately describe the location of burst mode header items. However, no burst mode level 1 data have previously been distributed. The following directory tree was removed: SOFTWARE/EXAMPLES/BIN The following files were updated: ERRATA.TXT README.TXT SOFTWARE/EXAMPLES/EX_README.TXT SOFTWARE/EXAMPLES/R_WBD_WF.C SOFTWARE/EXAMPLES/WBDL1.H SOFTWARE/EXAMPLES/WBDL1LIST.C WBFORMAT.TXT 3. Volume-specific errors WBD_20010203_14_A SOFTWARE/EXAMPLES/WBDL1.H was formatted with LF instead of CR/LF line termination. Several Cygwin DLL files are missing from SOFTWARE/EXAMPLES/BIN/WINDOWS_INTEL_CYGWIN/ which prevent the example executables from running stand-alone from this directory. WBD_20010215_28_A SOFTWARE/EXAMPLES/WBDL1.H was formatted with LF instead of CR/LF line termination. Several Cygwin DLL files are missing from SOFTWARE/EXAMPLES/BIN/WINDOWS_INTEL_CYGWIN/ which prevent the example executables from running stand-alone from this directory. WBD_20010301_17_A The volume label recorded on the disk is WBD_20010302_17_A. Several Cygwin DLL files are missing from SOFTWARE/EXAMPLES/BIN/WINDOWS_INTEL_CYGWIN/ which prevent the example executables from running stand-alone from this directory. WBD_20010318_30_A Invalid entries for MD5LF.TXT and MD5CRLF.TXT exist in each of the files by the same name. (Old files were not removed prior to generating new versions, so "md5sum -c" will fail for those two entries. These failures can be ignored.) Several Cygwin DLL files are missing from SOFTWARE/EXAMPLES/BIN/WINDOWS_INTEL_CYGWIN/ which prevent the example executables from running stand-alone from this directory. WBD_20010331_31_A Several Cygwin DLL files are missing from SOFTWARE/EXAMPLES/BIN/WINDOWS_INTEL_CYGWIN/ which prevent the example executables from running stand-alone from this directory.