Category Archives: News

For security reasons, this website is now static. A new website is under preparation.

Today we’ve received the sad message that Dr. Klaus Schüller, the developer of ETERNA-x, has passed away on March 18th 2020.  We are shocked and deeply saddened. We’ll keep this web site online to appreciate all his efforts in the further development of Eterna and to distribute the software.  

With the contribution “Comparison of Degree 3 Tidal Loading Effects from Superconducting Gravimeter Records with unconstrained Global Ocean Tide Simulations” by H. Wziontek, R. Sulzbach, H. Dobslaw and M. Thomas to the 19th International Symposium on Geodynamics and Earth Tides 2021, the capabilities of ETERNA-x for the analysis of smallest degree 3 constituents in the… Read More »

Predicting tides with a sample rate of 1 second raises an “ERROR of sequence”. The source of the problem is non-trivial. A possible workaround is to increase the sample rate, e.g. to 10 s and to interpolate. Interpolating tides at such high temporal resolution should not affect the accuracy.

The latest version v81, again with several improvements, was prepared to be released in March 2020. Here, the Linux-Version is made available, as it was missing for version v80: Please refer to the documentation of v80 as it is in major parts still valid. The latest version for Windows is still v80.

Although USNO has not yet resumed their website, the polar motion data are available from the IERS mirror site at BKG. The conversion for Eterna is provided with a weekly update cycle on Thursday again:

In this release for WINDOWS, all bugs and flaws reported for releases et34-x-v74-* are fixed. Presently, a publication date of release et34-x-v80-lnxgnu for LINUX cannot be told. Although et34-x-v74-lnxgnu is still kept in the download section, it is recommended to use the new WINDOWS version instead.

Bruno Meurers recently pointed out a misprint which was never affecting any version of Eterna. Nevertheless, it should be noted that in several publications [1], [2], [3] the mass of the tide-generating body should appear instead of the mass of the Earth in the degree-1 terms of the tidal potential equation. In the thesis [4]… Read More »

IERS informed that the USNO’s public-facing websites will be disconnected from the Web on 24 October 2019. The outage is expected to last for at least six months: https://datacenter.iers.org/data/2/message_384.txt Therefore the download of ETPOLUT1-WAS.DAT will be deactivated until the service from USNO is resumed.

The paper on ETERNA Ducarme,B., Schueller,K. : Canonical wave grouping as the key to optimal tidal analysis