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128.010 Earth rotation and global dynamic processes
This course is in all assigned curricula part of the STEOP.
This course is in at least 1 assigned curriculum part of the STEOP.

2022W, VO, 2.0h, 3.0EC
TUWEL

Properties

  • Semester hours: 2.0
  • Credits: 3.0
  • Type: VO Lecture
  • Format: Hybrid

Learning outcomes

After successful completion of the course, students are able to specify the transformation between space fixed and Earth fixed reference systems and the corresponding Earth orientation parameters and to explain the mechanisms and effects associated with the variable rotation of the Earth.

Subject of course

Transformation between celestial and terrestrial reference systems: definition of Earth orientation parameters (EOP), determination of EOP by means of space geodetic techniques; Theoretical background: rotation of a rigid Earth, rotation of a deformable Earth, polar motion, changes of the rotation speed, precession-nutation. Modeling of geophysical effects: angular momentum approach, torque approach, excitation functions.

Teaching methods

Explanation of the relevant reference systems, the Earth orientation parameters and the effects and mechanisms affecting Earth rotation with power point slides.

Mode of examination

Oral

Additional information

The lecture is given in English at TU Wien and broadcast live with Zoom. The lecturer will provide the recorded presentations via the TUWEL course.

Lecturers

Institute

Course dates

DayTimeDateLocationDescription
Tue09:00 - 10:3011.10.2022 - 24.01.2023Sem.R. DA grün 02 C - GEO Erdrotation - geodyn. Prozesse VO
Earth rotation and global dynamic processes - Single appointments
DayDateTimeLocationDescription
Tue11.10.202209:00 - 10:30Sem.R. DA grün 02 C - GEO Erdrotation - geodyn. Prozesse VO
Tue18.10.202209:00 - 10:30Sem.R. DA grün 02 C - GEO Erdrotation - geodyn. Prozesse VO
Tue25.10.202209:00 - 10:30Sem.R. DA grün 02 C - GEO Erdrotation - geodyn. Prozesse VO
Tue08.11.202209:00 - 10:30Sem.R. DA grün 02 C - GEO Erdrotation - geodyn. Prozesse VO
Tue22.11.202209:00 - 10:30Sem.R. DA grün 02 C - GEO Erdrotation - geodyn. Prozesse VO
Tue29.11.202209:00 - 10:30Sem.R. DA grün 02 C - GEO Erdrotation - geodyn. Prozesse VO
Tue06.12.202209:00 - 10:30Sem.R. DA grün 02 C - GEO Erdrotation - geodyn. Prozesse VO
Tue13.12.202209:00 - 10:30Sem.R. DA grün 02 C - GEO Erdrotation - geodyn. Prozesse VO
Tue10.01.202309:00 - 10:30Sem.R. DA grün 02 C - GEO Erdrotation - geodyn. Prozesse VO
Tue24.01.202309:00 - 10:30Sem.R. DA grün 02 C - GEO Erdrotation - geodyn. Prozesse VO

Examination modalities

The following topics are discussed in parts during the oral exam:

  • Which reference systems are relevant for the treatment of the variable Earth rotation, how are they realized?
  • How are changes in the orientation of the Earth described formally?
  • How are Earth orientation parameters determined – which techniques deliver which components?
  • Which equations are used to describe the rotation of the rigid Earth, which quantities do they contain?
  • Why is the rigid Earth's rotation speed constant?
  • Which components make up the polar motion of the rigid Earth?
  • What is tidal potential? – Where do different frequencies in the spectrum come from, which main periods are present (rough overview)?
  • Which axes are considered for the rotation of the rigid Earth and how do they move with respect to the space fixed system?
  • How does the body fixed reference system change due to the transition to a deformable Earth, which components are added to the equations of motion?
  • Which deformation effects are considered in the solution of the Euler-Liouville equation?
  • What is the difference between polar motion of the deformable Earth and polar motion of the rigid Earth?
  • What causes variations in the speed of rotation of a deformable Earth model (without atmosphere and oceans)?
  • Which effects arise when extending the Earth model for a fluid core?
  • Which approaches are used for modelling geophysical effects?
  • What is the name of the functions applied for modelling geophysical effects according to the angular momentum approach, into which terms are they split up?
  • Variations of length of day / universal time: time scales, periods and causes?
  • Phenomena of polar motion: time scales, periods and causes?

Course registration

Begin End Deregistration end
09.08.2022 13:00 17.10.2022 12:00

Group Registration

GroupRegistration FromTo
Distance Learning05.10.2022 10:00
Präsenz05.10.2022 10:00

Curricula

Study CodeObligationSemesterPrecon.Info
066 421 Geodesy and Geoinformation Mandatory elective3. Semester
066 463 Geodesy and Geophysics Mandatory9. Semester

Literature

Earth Rotation: Theory and Observation (Moritz & Mueller, 1988), The Earth's Variable Rotation: Geophysical causes and consequences (Lambeck, 1980), The Earth and its Rotation (Zharkov et al., 1996), Earth Rotation Variations - Long Period (Gross, 2007)

Previous knowledge

Lectures of mathematics and physics of the three first semesters required, higher geodesy, Earth gravity field.

Accompanying courses

Language

English