The GOES-8 Sounder Observes the Montserrat Volcano

Sounder images from September 23, 1997

GOES-8 sounder for BAND 8 (01:34 UTC)

GOES-8 sounder for BAND 8 (11:34 UTC)

GOES-8 sounder for BAND 8 (13:34 UTC)

GOES-8 sounder for BAND 8 minus 7 (11 minus 12 micrometers) 01:34UTC

GOES-8 sounder for BAND 8 minus 7 (11 minus 12 micrometers)  11:34UTC
GOES-8 sounder for BAND 8 minus 7 (11 minus 12 micrometers) 11:34UTC

GOES-8 sounder for BAND 8 minus 7 (11 minus 12 micrometers) 13:34UTC

A difference of the 12 and 11 micrometer channels on the GOES-8 sounder does show evidence of the plume (both east and west of the island). Note the negative differences (blue) of the band 8 minus 7 difference, especially at the 11:34 UTC time period. At this time, the difference is over 5C!

Below is more information about the pixel just to the east of the Island of Monserrat (and the pixel to the east of that pixel).


area  ss  yyddd hhmmss  lcor  ecor lr er zr  lsiz  esiz z    bands
---- ---- ----- ------ ----- ----- -- -- -- ----- ----- -    -----
8022  71  97266 112000  5401  8931 10 10 19   160   288 2 123456789ABCDEFG

NOTE        := AT THE POINT *EAST* OF THE ISLAND
NOTE        := SCALED (x100) BRIGHTNESS TEMPERATURES:
GIMD
LINE   ELEM    LAT    LON   LZEN   SZEN   ELEV   SURF    VIS
6445   9945   1674   6207   2439   6722    365      7      6
CHAN1  CHAN2  CHAN3  CHAN4  CHAN5  CHAN6  CHAN7  CHAN8  CHAN9
21889  21839  23488  25011  25146  26126  26845  26281  25000
CHA10  CHA11  CHA12  CHA13  CHA14  CHA15  CHA16  CHA17  CHA18
25387  24622  23827  26281  25474  23895  28048  28272  29085

NOTE        := AT THE POINT *EAST* OF THE ABOVE MENTIONED PIXEL
NOTE        := SCALED (x100) BRIGHTNESS TEMPERATURES:
GIMD
LINE   ELEM    LAT    LON   LZEN   SZEN   ELEV   SURF    VIS
6445   9955   1674   6197   2446   6713      0      0      4
CHAN1  CHAN2  CHAN3  CHAN4  CHAN5  CHAN6  CHAN7  CHAN8  CHAN9
21711  21839  23996  25951  26886  28684  29102  29311  27232
CHA10  CHA11  CHA12  CHA13  CHA14  CHA15  CHA16  CHA17  CHA18
26483  25661  24432  28365  26951  24714  29064  29781  29876

LZEN is the local zenith angle, SZEN is the solar zenith angle
ELEV is the surface elevation (m),  SURF is surface type (0=ocean)
time, dwell, step, dect, sat:   113446     1     0     1     8

While the imager has finer resolution, the sounder has several additional channels. The higher resolution of the imager in the visible, IR window, and split window difference are shown.
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