The Volcanoes of Io The Volcanoes of Io
Message 9/109 From Paul Varsho, Menomonie Middle ScFeb 11, 95 08:07:50 pm -0600
Date: Sat, 11 Feb 1995 20:07:50 -0600 (CST)
Subject: Io Light Curve Activity and Brightness Answered
To: jason-teach@acme.fred.org
X-Vms-To: IN%"jason-teach@acme.fred.org"
Teachers of the JASON Curriculum:
For those of you who have notice Jude Kesl's question about the
Io's brightness scale I will try to answer the question. The
brightness scale is the vertical axis of the light curve graph on
master 1.4 Light Curve. It is really the brightness of Io in the
infrared spectrum. The numbers represent FLUX measured in Watts/square
meter.
For those of you who will be covering the material on the volcanoes on
Jupiter's moon, Io, you may want to considered doing the following
activity. Have your students on the below chart graph the original Io
light curve data points surplied by the astronomer Dr. John Spencer.
You should end up with a light curve similar to the graph found on
Master 1.4e A Light Curve (longitudes 180 through 0 will not be
duplicated as on the master). The big difference will be that the
students have constructed the 1989-90 curve themselves. The peak in
the light curve indicates there was an active violent volcano at
longitude 310 during 1989-90. This volcano was probably Loki!
With this year's data appearing on Internet, your students can
construct a second light curve for 1995 and compare it to the 1989-90
curve to determine if the volcano Loki is still active or are there new
active volcanoe s.
Good Luck with the astronomy activity
Paul Varsho
JASON Teacher Argonaut
1989-90 Light Curve for Io
0.17|---------------|---------------|---------------|---------------|
0.16|---------------|---------------|---------------|---------------|
0.15|---------------|---------------|---------------|---------------|
0.14|---------------|---------------|---------------|---------------|
0.13|---------------|---------------|---------------|---------------|
0.12|---------------|---------------|---------------|---------------|
0.11|---------------|---------------|---------------|---------------|
0.10|---------------|---------------|---------------|---------------|
0.09|---------------|---------------|---------------|---------------|
0.08|---------------|---------------|---------------|---------------|
0.07|---------------|---------------|---------------|---------------|
0.06|---------------|---------------|---------------|---------------|
0.05|---------------|---------------|---------------|---------------|
0.04|---------------|---------------|---------------|---------------|
0.03|---------------|---------------|---------------|---------------|
0.02|---------------|---------------|---------------|---------------|
0.01|---------------|---------------|---------------|---------------|
180 90 0 90 180
1995 Light Curve for Io
0.17|---------------|---------------|---------------|---------------|
0.16|---------------|---------------|---------------|---------------|
0.15|---------------|---------------|---------------|---------------|
0.14|---------------|---------------|---------------|---------------|
0.13|---------------|---------------|---------------|---------------|
0.12|---------------|---------------|---------------|---------------|
0.11|---------------|---------------|---------------|---------------|
0.10|---------------|---------------|---------------|---------------|
0.09|---------------|---------------|---------------|---------------|
0.08|---------------|---------------|---------------|---------------|
0.07|---------------|---------------|---------------|---------------|
0.06|---------------|---------------|---------------|---------------|
0.05|---------------|---------------|---------------|---------------|
0.04|---------------|---------------|---------------|---------------|
0.03|---------------|---------------|---------------|---------------|
0.02|---------------|---------------|---------------|---------------|
0.01|---------------|---------------|---------------|---------------|
180 90 0 90 180
Here are the original Io light curve data points from 1989-90 that are in the
graph in the curriculum, for the students to plot. Volcanic heat flux is
measured in Watts per square meter radiated between 4.5 and 5.5 microns
wavelength, approximately, averaged overthe whole surface of Io.
Hope this is useful,
Dr. John Spencer
Longitude Flux Longitude Flux
West Watts/sq.m. West Watts/sq.m.
36.3000 0.02410000 41.2000 0.02610000
48.4000 0.03090000 57.1000 0.03420000
69.2000 0.04190000 71.3000 0.04340000
77.4000 0.04660000 83.8000 0.04970000
68.9000 0.02920000 72.0000 0.03030000
83.2000 0.02590000 85.6000 0.00890000
85.9000 0.03030000 94.1000 0.03130000
96.5000 0.03110000 103.900 0.03520000
319.500 0.07120000 331.500 0.07140000
337.600 0.07120000 339.700 0.07450000
342.800 0.06150000 115.300 0.03900000
118.300 0.02840000 134.500 0.02470000
71.0000 0.03270000 73.0000 0.03480000
78.2000 0.03830000 83.4000 0.04300000
113.500 0.03350000 119.500 0.03750000
266.500 0.07050000 268.600 0.06960000
276.500 0.07700000 278.600 0.07920000
284.800 0.08170000 286.800 0.08120000
293.500 0.09199999 295.500 0.09380000
308.300 0.08960000 310.300 0.08760001
315.400 0.08680000 323.400 0.08830000
328.400 0.08830000 330.400 0.08830000
332.400 0.08600000 112.100 0.03420000
113.900 0.03320000 124.600 0.03430000
126.800 0.03460000 134.400 0.03490000
136.200 0.03520000 141.900 0.04110000
147.000 0.03900000 151.800 0.03530000
158.200 0.03070000 163.200 0.02960000
165.500 0.02970000 167.600 0.02320000
164.700 0.02580000 167.300 0.02190000
196.600 0.01870000 198.700 0.02320000
205.000 0.02440000 207.100 0.03160000
212.900 0.02920000 215.300 0.03070000
220.500 0.03380000
Data taken during a volcanic outburst (perhaps at Loki) in Jan.1990:
Longitude Flux Longitude Flux
West Watts/sq.m. West Watts/sq.m.
324.700 0.1880000 326.600 0.1830000
331.900 0.1670000 339.400 0.1500000
341.500 0.1450000 343.800 0.1400000
346.100 0.1380000 347.900 0.1440000
Again Good luck with the activity
Paul V.
JASON Project homepage || Teachers' Guide || Students' Corner || Search
Gene Carl
Feldman
(gene@seawifs.gsfc.nasa.gov)
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Todd Carlo Viola,
JASON Foundation for Education
(todd@jason.org)
The Volcanoes of Io