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Conclusions:
As shown by the profiles we get variation between the different hours, this is because the separate observations are widely scattered (several hundred meters). In figure 3 a part should be considered as noise. These tracks come in from the south and in their history (fig. 2) they have touched the south-pole continent and left land when they passed out of North-America. They have a very long distance to travel over only water.
When it comes to the observations in figure 4 i.e. the tracks coming in from the north (from the Asian continent) there is a distinguished increase in the observation-sets after 4 p.m. despite the noise.
When forming GRD-data in a reprocessing the orbit have been "cut out" and fit into two separate two-day-intervals. This might explain the big "jump" at 24-01 o'clock. A trend indicating that the satellite during daylight get closer to the surface of the sea only to start moving outwards at dusk can also be seen.
What is it then that differs these orbits from the orbits in figure 3? Well, these orbits have left land about 500-600 kilometers ago i.e. 1.5 to two minutes ago. This is a relatively short period of time compared to the north-western orbits.
It seems that we get a variation in height when the tracks pass over land. This comes natural if we assume that the temperature does affect the height of the orbit. The temperature during day varies on land, but at sea it should be close to constant.
Since these are averages coming from several years you could say that this represents the temperature-variation during 24 hours in a mean sense on a year basis. Unfortunately the further observations are very far from land which probably causes the height-variance produced by variation in temperature to be smoothed out.
In this result there is except for noise also a signal showing that the satellite reacts on the variations of temperature of earth. The size of this should be considerably larger than shown here.
This makes a closer study of this phenomena even more interesting.
To be able to reveal this phenomena, further studies should be made accordingly:
- Usage of the today available altimeterdata from TOPEX/Poseidon which today has over one hundred passes in the same track and is continuing to measure. The data used should not be orbital corrected.
- The areas for testing should be chosen so that we get data with a long history over land (Asia, Europe, Africa) and should be closely connected to when the orbits leave land. As a reference orbits with a long history over water should be chosen (the amount of noise and so on). At the same time several independent areas should be chosen. With a larger number of observations it will be possible to add variation depending on what time of year it is and meteorological factors (ex. The temperature at a pass and so on).
- When the satellite moves in a orbit around earth it is affected by the sun and the moon (the moon can affect the orbit for as much as about 1200 meters in extreme cases) therefore it is necessary to make corrections for celestial bodies.
So in spite of some disturbance this test shows that the satellites orbit (height) is depending on the temperature on the surface of earth.
Conclusion: Gravity is depending on temperature.
References:
1. The use of Altimeter Data over Scandinavian water for a study of the geoid.
Per Nordin 1982
Lund Institute of Technology
University of Lund
Department of Geodetic Surveying
P.O. Box 775 s-22007 Lund Sweden
2. US Patent Number: 5,001,634
US Patent Number: 5,602,731
US Patent Number: 5,615,114
European Patent Number: 294,464
3 GRAVITATIONAL EFFECTS
A study of structure, motion and interaction of photons and particles combined
with a theory of the cause and behaviour of gravitation.
Hans O. L. Lidgren
Propatria AB, Sjobo, Sweden
Fax nr: ++46 416 18740
Printed by: KF-Sigma, LTH, Lund, Sweden
ISBN 91-972608-0-5
Per Nordin
Sångarevägen 2:B
224 71 LUND
Sweden
per.nordin@mbox301.swipnet.se
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