ETERNA-x

Static Website

HWz — Mon, 03 Jul 2023 17:17:55 +0000

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

In memoriam

HWz — Thu, 23 Apr 2020 14:12:28 +0000

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.

Capabilities of ETERNA-x demonstrated by analysis of degree 3 tidal loading effects

HWz — Thu, 08 Jul 2021 18:34:52 +0000

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 few nGal range was justified. The good agreement not only confirms the ocean tide model TiME but also the high quality of the records from the superconducting gravimeters – and the analysis software. The presentation is available on the conference web page or from here. A publication is in progress.

Predicition of tides with one second sample rate

HWz — Thu, 25 Feb 2021 20:45:47 +0000

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.

ETERNA-x system et34-x-v81-lnxgnu is available

HWz — Wed, 15 Jul 2020 13:03:13 +0000

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:

5. System et34-x-v81-lnxgnu (linux, no graphics) (5 downloads)

Please refer to the documentation of v80 as it is in major parts still valid.

The latest version for Windows is still v80.

Polar Motion and LOD file etpolut1-was.dat available again

HWz — Tue, 14 Jul 2020 13:54:11 +0000

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:

6a. The DUT1, Polar Motion and LOD file etpolut1-was.dat (5 downloads)

ETERNA-x system et34-x-v80-gnusim released on 17.Jan.2020!

KS — Fri, 17 Jan 2020 06:18:08 +0000

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.

V1-potential terms in papers addressing the HW95 tidal potential

HWz — Mon, 04 Nov 2019 15:34:11 +0000

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] the degree-1 terms are correct, see HW95 misprint (5 downloads) .

[1] Hartmann, T., Wenzel, H.G., 1995, The HW95 tidal potential catalogue, Geophys. Res. Lett., 22(24), 3553–3556.
[2] Hartmann, T., Wenzel, H-G., 1995, Catalogue HW95 of the tide generating potential, Bull. Inf. Marees Terrestres, 123, 9278-9301.
[3] Wenzel, H.G., 1997, Tide-Generating Potential for the Earth, in: H. Wilhelm, W., Zürn, H.G. Wenzel, (Eds.), Tidal Phenomena, (pp. ), Lect. Notes Earth Sci., 66, Springer Berlin Heidelberg, 9–26, https://doi.org/10.1007/BFb0011455
[4] Hartmann, T., 1996, Hochgenaue Nutationsbewegung einer starren Erde aus einer verbesserten Gezeitenpotentialentwicklung, 272p, Geodät. Inst., Karlsruhe.

Temporary deactivation of Polar Motion and LOD file ETPOLUT1-WAS.DAT

HWz — Wed, 23 Oct 2019 11:03:48 +0000

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.

Paper about ETERNA-x in BIM 150 (see Download section)

KS — Fri, 23 Nov 2018 05:54:49 +0000

The paper on ETERNA

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

was published in vol. 150 of Bulletin d’Informations des Marees Terrestres (BIM) which is available for download here.