[IGSMAIL-0861] JOZE height problems if using a dome

[E.]

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IGS Electronic Mail      Tue Jan 31  4:59:49 PST 1995      Message Number 0861
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Author: E. Brockmann, M. Piraszewski 
Subject: JOZE height problems if using a dome

Dear Colleagues,

Recently we found problems in our daily solutions for JOZE in the Up direction.
Outliers between -7 and +10 cm have been detected.

Below you can find the residuals in the North, East and Up components
for the days 357 (1994) to 021 (1995).

The reason for this is quite astonishing: At all days with these excursions
a plexiglass dome was placed above the antenna. These days are marked in the 
table below with '======'.

The reason for this is probably remaining snow on the dome or may be also
a different humidity under the dome.

For the purposes of IGS it is important if similar problems
are known for other IGS antennas with a dome.
Any comments and suggestions are very appreciated.

>From DOY 029 the dome is removed from the antenna.

Greetings,

Elmar Brockmann (CODE processing center)
Mieczyslaw Piraszewski (Warsaw University of Technology)





                          \ DOY 350    351   352  353   354   355   356   357 
                         RMS                                                  
JOZE 12204M001   37  N  0.011 -0.012-0.010-0.012-0.013-0.015-0.014-0.012-0.013
                     E  0.014 -0.009-0.015-0.008-0.008-0.007-0.011-0.012-0.013
                     U  0.051  0.018 0.028 0.023 0.021 0.019 0.039 0.017-0.012
                                                                         =====

                               358   359   360    361   362   363   364   365 
                                                                              
                              -0.009-0.007-0.008-0.010-0.011-0.009-0.010-0.012 
                              -0.015-0.017-0.020-0.014-0.017-0.020-0.022-0.012 
                              -0.027-0.030-0.034-0.058-0.070-0.068-0.066-0.063 
                              ================================================

                                 1     2     3     4     5      6     7    8  
                                                                              
                              -0.009 0.012 0.010 0.011 0.008 0.006 0.010 0.013
                              -0.018 0.002 0.004 0.001 0.006 0.009 0.009 0.008
                              -0.058-0.053-0.060-0.063-0.045-0.006-0.014-0.003
                              ==============================                  

                                 9     10    11    12    13    14    15    16 
                                                                              
                               0.008 0.006 0.008 0.010 0.008 0.007 0.015 0.010
                               0.005 0.009 0.016 0.011 0.013 0.018 0.007 0.016
                              -0.006 0.011 0.007 0.002-0.003-0.002 0.029 0.084
                                                                         =====

                                17    18    19     20    21

                               0.013 0.009 0.007 0.009 0.006
                               0.017 0.021 0.021 0.021 0.024
                               0.070 0.078 0.086 0.097 0.111
                               =============================




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Elmar Brockmann, Astronomical Institute, University of Berne, Sidlerstrasse 5
CH-3012 Bern, Switzerland, Tel: ++41-31-6318591/6318599, Fax: ++41-31-6313869
E-Mail: brockmann at aiub.unibe.ch                 SPAN: 20579::49203::brockmann


[Mailed From: Brockmann Elmar <BROCKMANN at aiub.unibe.ch>]