Voyager Model

Model Input


Year (e.g. 1923)
(Negative for BC, positive for AD, 1950 or earlier)
:
 Month

Degrees
(Positive for East, Negative for West)
:
 Degrees
(Positive for North, Negative for South)

Degrees
(Positive for East of North, Negative for West of North)

Log Line Speed
(in specified unit)


 

 

 
Model Results


Meters Per Second
(m/s)

Degrees
(Positive for North of East, Negative for South of East)

Degrees
(Positive for East, Negative for West)

Degrees
(Positive for North, Negative for South)

Degrees
(Positive for East of North, Negative for West of North)

Degrees
(Positive for tilt downward, Negative for tilt upward)

milliTesla

 

Description

Magnetic inclination is the angle through which a freely suspended magnet would dip below the horizon in the magnetic north-south meridional plane. Zero degrees inclination means the magnetic field is parallel to the surface of the earth. Ninety degrees declination means the magnetic field points straight up or down. Declination is ninety degrees at either magnetic pole.

The magnetic declination measures the angle between the direction a compass needle points (magnetic north pole) and the direction to the true (geographic) north pole. The magnetic north pole currently is at point in the Northwest Territories, Canada: at about 78.4°N Latitude, and about 104.3°W longitude.

This model uses data on currents gathered from ships during the 20th Century and averaged over all available years for each month. As such, the model currents do not necessarily accurately represent the state of ocean surface currents on any specific date, at any selected location.

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Instructions

To run the model input a site longitude, site latitude, date (1950 or earlier), compass heading, log line speed, time duration, and whether or not you would like variable currents and magnetic field declination. Values for latitude and longitude are in degrees and the date is the the 4-digit year. Next, click on the "Run Model" button and the model will return results. Examine Lesson 1 for more information on utilizing this model.

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References

This computer code for this model is based on CALS7Kfield.f and its associated data file CALS7K.2. We are grateful to the researchers who did this work and gave permission to adapt their computer code to a web browser.

  • Korte, M., A. Genevey, C. G. Constable, U. Frank, and E. Schnepp (2005), Continuous geomagnetic field models for the past 7 millennia: 1. A new global data compilation, Geochem. Geophys. Geosyst., 6, Q02H15, doi:10.1029/2004GC000800.
  • Korte, M., and C. G. Constable (2005), Continuous geomagnetic field models for the past 7 millennia: 2. CALS7K, Geochem. Geophys. Geosyst., 6, Q02H16, doi:10.1029/2004GC000801.
  • Contact Information: Dr. Arthur J. Mariano, Associate Professor, Meteorology & Physical Oceanography, Rosenstiel School of Marine & Atmospheric Science, University of Miami, mail:RSMAS/MPO, 4600 Rickenbacker Cswy, Miami, FL 33149 email:amariano@rsmas.miami.edu tel:305-361-4193, fax:305-361-4622 http://www.rsmas.miami.edu/people/amariano/
  • Mariano, A.J. and O.B. Brown. Efficient objective analysis of dynamically heterogeneous and nonstationary fields via the parameter matrix. Deep-Sea Res., 39(7/8), 1992, 1255-1271.
  • Mariano, A.J., E.H. Ryan, B.D. Perkins, S. Smithers. The Mariano Global Surface Velocity Analysis 1.0, U.S. Coast Guard Technical Report, CG-D-34-95, 1995.
  • Ryan, E.H., A.J. Mariano, D.B. Olson, R.H. Evans, Global Sea Surface Temperature and Currents, 1996 Fall AGU Meeting Eos, Transactions, AGU, Vol 77, No 46, November 12, 1996 (OP22A-16).

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