Subject: [Fwd: Re: Jason models]
From: "Frank Lemoine" <[email-masked]>
To: [email-masked]
Date: Tue, 17 Oct 2006 18:46:23 -0000 (GMT)

---------------------------- Original Message ----------------------------
Subject: Re: Jason models
From:    "Jean-Paul Berthias" <[email-masked]>
Date:    Tue, October 17, 2006 2:50 pm
To:      "John C. Ries" <[email-masked]>
Cc:      [email-masked]
         [email-masked]
         "Nikita Zelensky" <[email-masked]>
         "Dr. Erricos C. Pavlis" <[email-masked]>
         [email-masked]
         "Pascal Bonnefond" <[email-masked]>
         "Cerri Luca" <[email-masked]>
         "Mercier Flavien" <[email-masked]>
         "Laurent Soudarin" <[email-masked]>
         [email-masked]
--------------------------------------------------------------------------

Hi John,

In your last Email you propose to
> 1)* We adopt the IERS2003 values for C21/S21 at epoch 2000.0 as well as
> the rates. These are consistent with the mean pole and rates adopted for
> the pole tide, also in the standards.* Because the rates were not used
> for EIGEN-GL04C, this is the only way I see to ensure consistency with
> the pole tide model.

Just to make sure that we all understand the same thing, the standards
tell us
(at the beginning of chapter 6) how to compute the C21/S21 and associated
rates
from the values of the mean pole and C20, C22 and S22. We should adopt the
mean
pole (and mean pole rate from the standards), but the C20, C22 and S22 of the
gravity model that we plan to use (EIGEN-GL04C).

When we do that we obtain values of C21/S21 slightly different than those
given
in the standards which are valid for EGM96. The EIGEN based standards are

C21 = -2.36e-10
S21 = 15.12e-10
C21dot = -0.341e-12
S21dot =  1.602e-12

Is that what you mean ?

Best regards,
Jean-Paul

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