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September 2, 2001 (day 245), 4:00 UT
The downward-chirping sounds near 50 Hz are the sound in question. (The lines going clear across the spectrogram are electronic artifacts, not ocean sounds.) |
August 12, 2002 (day 224), 19:15 UT
Ship-engine noise? |
August 30, 2002 (day 242), 1:45 UT
A distant source? |
September 3, 2002 (day 246), 0:15 UT
Signals about 65 sec long, repeated for several hours. |
August 30, 2002 (day 242), 1:45 UT
A distant source. |