1 / 8

Solid Earth Tides

Solid Earth Tides. ASEN 6090. Vertical Effect - over a month. http://stardate.org/nightsky/moon/index.php?month=10&year=2007&css=moon.css&Submit=Go. I used : http://home.comcast.net/~dmilbert/softs/solid.htm.

laszlo
Download Presentation

Solid Earth Tides

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Solid Earth Tides ASEN 6090

  2. Vertical Effect - over a month

  3. http://stardate.org/nightsky/moon/index.php?month=10&year=2007&css=moon.css&Submit=Gohttp://stardate.org/nightsky/moon/index.php?month=10&year=2007&css=moon.css&Submit=Go I used : http://home.comcast.net/~dmilbert/softs/solid.htm

  4. Everybody is used to the ocean tide. The pull of the Moon and the Sun on the ocean causes cyclic variations in local sea level that can exceed 10 meters in some places.What is less well known is that the Earth itself also responds to lunisolar gravitational attraction. The solid earth tide (body tide) often reaches +/- 20 cm, and can exceed 30 cm. While ocean tides can be easily measured relative to the solid Earth, solid earth tides are easily measured only with satellite systems or sensitive gravimeters. Also, the solid earth tide is a very smooth function around the Earth. For this reason, differential positioning systems, such as differential carrier phase GPS, can frequently ignore solid earth tide effects. Global geodetic networks and GPS carrier phase precise point positioning must include the effect of solid earth tide.

  5. WES2 (outside Boston) vs USNO (Washington D.C.)

  6. http://en.wikipedia.org/wiki/Earth_tide Semi-diurnal Tidal constituent Period Vertical amplitude (mm) Horizontal amplitude(mm) M212.421 hr 384.83 53.84 S212.000 hr 179.05 25.05 N212.658 hr 73.69 10.31 K211.967 hr 48.72 6.82 Diurnal Tidal constituent Period Vertical amplitude (mm) Horizontal amplitude(mm) K123.934 hr 191.78 32.01 O125.819 hr 158.11 22.05 P124.066 hr 70.88 10.36 φ123.804 hr 3.44 0.43 ψ123.869 hr 2.72 0.21 S124.000 hr 1.65 0.25 Long term Tidal constituent Period Vertical amplitude (mm) Horizontal amplitude(mm) Mf 13.661 days 40.36 5.59 Mm 27.555 days 21.33 2.96 SsaSolar semi-Annual 0.50000 yr 18.79 2.60 lunar node 18.613 yr 16.91 2.34 Sa Solar Annual 1.0000 yr 2.97 0.41 00

More Related