The website http://www-pw.physics.uiowa.edu/~rra/GEOTAIL/IMHOF/IMHOF_2004_paper/ contains the Geotail PWI SFA electric field spectrograms generated by Roger R. Anderson that correspond to Figure 4 in the Imhof et al., 2004 paper. GSF5L refers to a single linear in frequency plot that covers 0 to 800 kHz. GSF refers to a five band spectrogram that covers 25 Hz to 800 kHz. 80 DB refers to the spectral intensity scale that covers -190 to -110 dB Volt/meter/square root Hz. 60 DB refers to the spectral intensity scale that covers -190 to -130 dB Volt/meter/square root Hz. This list is current as of 11:31 AM April 29, 2004, CDT. Figure 4a-1 January 10, 1999 GSF5L 60 DB 2300 UT to 0300 UT GSF5L 80 DB 2300 UT to 0300 UT GSF 60 DB 2300 UT to 0300 UT GSF 80 DB 2300 UT to 0300 UT Figure 4a-2 January 15, 1999 GSF5L 60 DB 1200 UT to 1320 UT GSF5L 80 DB 1200 UT to 1600 UT GSF 60 DB 1200 UT to 1320 UT GSF 80 DB 1200 UT to 1600 UT Figure 4b-1 January 21, 1999 GSF5L 60 DB 0800 UT to 1200 UT GSF5L 80 DB 0800 UT to 1200 UT GSF 60 DB 0800 UT to 1200 UT GSF 80 DB 0800 UT to 1200 UT Figure 4b-2 January 29, 1999 GSF5L 60 DB 1600 UT to 1800 UT GSF 60 DB 1600 UT to 1800 UT GSF 60 DB 1600 UT to 2000 UT GSF 80 DB 1600 UT to 2000 UT Figure 4c-1 February 11, 1999 GSF5L 60 DB 0000 UT to 0400 UT GSF5L 80 DB 0000 UT to 0400 UT GSF 60 DB 0000 UT to 0400 UT GSF 80 DB 0000 UT to 0400 UT Figure 4c-2 March 4, 1999 GSF5L 60 DB 2000 UT to 0000 UT GSF5L 80 DB 2000 UT to 0000 UT GSF 60 DB 2000 UT to 0000 UT GSF 80 DB 2000 UT to 0000 UT GSF 80 DB 2100 UT to 2300 UT Figure 4d-1 March 27, 1999 GSF5L 60 DB 2000 UT to 0000 UT GSF5L 80 DB 2000 UT to 0000 UT GSF 60 DB 2000 UT to 0000 UT GSF 80 DB 2000 UT to 0000 UT Figure 4d-2 June 29, 1999 GSF5L 60 DB 0800 UT to 1030 UT GSF5L 80 DB 0800 UT to 1030 UT GSF5L 80 DB 0800 UT to 1100 UT GSF5L 60 DB 0800 UT to 1200 UT GSF5L 80 DB 0800 UT to 1200 UT GSF 60 DB 0800 UT to 1030 UT GSF 80 DB 0800 UT to 1030 UT GSF 80 DB 0800 UT to 1100 UT GSF 60 DB 0800 UT to 1200 UT GSF 80 DB 0800 UT to 1200 UT Figure 4e-1 August 26, 1999 GSF5L 60 DB 1200 UT to 1600 UT GSF5L 80 DB 1200 UT to 1600 UT GSF 60 DB 1200 UT to 1600 UT GSF 80 DB 1200 UT to 1600 UT Figure 4e-2 February 25, 2000 GSF5L 60 DB 0930 UT to 1330 UT GSF5L 80 DB 0930 UT to 1330 UT GSF 60 DB 0930 UT to 1330 UT GSF 80 DB 0930 UT to 1330 UT GSF 80 DB 1000 UT to 1400 UT Figure 4f-1 March 14, 2000 GSF5L 60 DB 0800 UT to 1200 UT GSF5L 80 DB 0800 UT to 1200 UT GSF 60 DB 0800 UT to 1200 UT GSF 80 DB 0800 UT to 1200 UT Figure 4f-2 June 27, 2000 GSF5L 60 DB 2100 UT to 0100 UT GSF5L 80 DB 2100 UT to 0100 UT GSF 60 DB 2100 UT to 0100 UT GSF 80 DB 2100 UT to 0100 UT