Short-period geomagnetic variations recorded concurrently with an aeromagnetic survey across the Bendigo area, Victoria

Peter R. Milligan

doi:10.1071/EG995527

ISSN: 0812-3985
E-ISSN: 1834-7533

Short-period geomagnetic variations recorded concurrently with an aeromagnetic survey across the Bendigo area, Victoria
Authors Peter R. Milligan^a
View Affiliations Hide Affiliations

^a Australian Geological Survey Organisation, G.P.O. Bpx378 Canberra City, , ACT, 2601, Phone: (06) 249 9224, Fax: (06) 249 9986
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 26, Issue 4, Sep 1995, p. 527 - 534
DOI: https://doi.org/10.1071/EG995527
- Published online: 01 Sep 1995

Abstract

A high-resolution aeromagnetic survey was undertaken by the Australian Geological Survey Organisation (AGSO) across the Bendigo 1:250 000 map sheet area during February to April 1994. For part of this period, high-resolution ground magnetometers were also deployed to test for the way that short-period variations of the geomagnetic field (including micropulsations) affect data recorded by the aircraft.

These ground instruments consisted of the newly developed Helium base-station for AGSO aeromagnetic surveys, and two ring-core fluxgate magnetometers developed by the School of Earth Sciences at The Flinders University of South Australia. The Helium instrument was deployed at the Bendigo airport, in the south-west corner of the area, and the ring-core instruments were buried in the north-west and north-east corners of the area.

Preliminary results indicate that while the phases of continuous Pc3 micropulsations of about 20 s period change little across the map sheet area, the amplitudes can vary significantly. For longer period geomagnetic variations (60 s to 600 s), there are significant differences in the amplitudes and phases of the total-field values measured at different sites. Induction vectors indicate a shallow zone of higher conductivity between the east and west measurement sites.

Data from a single base-station magnetometer subtracted from airborne survey data will not adequately remove the short-period geomagnetic variations of the total field recorded during this survey period — they are an additional noise source in the survey data.

Article metrics loading...

/content/journals/10.1071/EG995527

1995-09-01

2026-01-13

From This Site

/content/journals/10.1071/EG995527

dcterms_title,dcterms_subject,pub_keyword

-contentType:Journal -contentType:Contributor -contentType:Concept -contentType:Institution

10

5

Full text loading...

References

Chamalaun, F.H. and Barton, C.E., 1993, The large-scale electrical conductivity structure of Australia: J. Geomag. Geoelectr. 45, 1209-1212.
Cole, D.G., 1993, Geomagnetic effects in a high tech society: forecasting solar-induced geomagnetic disturbances: Exploration Geophysics 24, 105-110.
Egbert, G.D. and Booker, J.R., 1986, Robust estimation of geomagnetic transfer functions: Geophys. J. R. astr. Soc. 87, 173-194.
Hopgood, P.A., 1993, Australian magnetic observatories: Exploration Geophysics 24, 79-82.
Lam, H., 1989, On the prediction of low-frequency geomagnetic pulsations for geophysical prospecting: Geophysics 54, 635-642.
Lilley, F.E.M. and Bennett, D.J., 1972, An array experiment with magnetic variometers near the coasts of southeast Australia: Geophys. J.R. astr. Soc. 29, 49-64.
b>Lilley, F.E.M., 1976, A magnetometer array study across southern Victoria and the Bass Strait area, Australia: Geophys. J.R. astr. Soc. 46, 165-184.
Menk, F.W., 1993, Low latitude geomagnetic pulsations: a user’s guide: Exploration Geophysics 24, 111-114.
Milligan, P.R., 1988, Short-period transfer-function vectors for Canberra and Charters Towers magnetic observatories: J. Geomag. Geoelectr. 40, 95-103.
Milligan, P.R., White, A., Heinson, G. and Brodie, R., 1993, Micropulsation and induction array study near Ballarat, Victoria: Exploration Geophysics 24, 117-122.
Milligan, P.R., Mackey, T. and Franklin, R. (Compilers), 1995, Total magnetic intensity with westerly illumination colour pixel image map of Bendigo, Victoria, scale 1:250 000: Australian Geological Survey Organisation.
Ochadlick, A.R., 1990, Time series and correlation of pulsations observed simultaneously by two aircraft: Geophysical Research Letters 17, 1889-1892.
Parkinson, W.D., 1983, Introduction to Geomagnetism: Scottish Academic Press, Edinburgh and London.
Reeves, C.V., 1993, Limitations imposed by geomagnetic variations on high quality aeromagnetic surveys: Exploration Geophysics 24, 115-116.

/content/journals/10.1071/EG995527

Article Type: Research Article

Keyword(s): aeromagnetic; geomagnetic variations; induction vectors; magnetometer; micropulsations

Most Cited This Month Most Cited RSS feed

- A comparison of smooth and blocky inversion methods in 2D electrical imaging surveys
  
  Authors M.H. Loke, Ian Acworth and Torleif Dahlin
- Reverse-Time Migration using the Poynting Vector
  
  Authors Kwangjin Yoon and Kurt J. Marfurt
- SkyTEM–a New High-resolution Helicopter Transient Electromagnetic System
  
  Authors K. I. Sorensen and Esben Auken
- An overview of a highly versatile forward and stable inverse algorithm for airborne, ground-based and borehole electromagnetic and electric data
  
  Authors Esben Auken, Anders Vest Christiansen, Casper Kirkegaard, Gianluca Fiandaca, Cyril Schamper, Ahmad Ali Behroozmand, Andrew Binley, Emil Nielsen, Flemming Effersø, Niels Bøie Christensen, Kurt Sørensen, Nikolaj Foged and Giulio Vignoli
- The Fast Marching Method: An Effective Tool for Tomographic Imaging and Tracking Multiple Phases in Complex Layered Media
  
  Authors Nicholas Rawlinson and Malcolm Sambridge
- 3-D Analytic Signal in the Interpretation of Total Magnetic Field Data at Low Magnetic Latitudes
  
  Authors Ian N. MacLeod, Keith Jones and Ting Fan Dai
- CMP cross-correlation analysis of multi-channel surface-wave data
  
  Authors Koichi Hayashi and Haruhiko Suzuki
- A new direct non-invasive groundwater detection technology for Australia
  
  Authors M. Schirov, A. Legchenko and G. Creer
- 3D inversion of airborne electromagnetic data using a moving footprint
  
  Authors Leif H. Cox, Glenn A. Wilson and Michael S. Zhdanov
- Notes On Rock Magnetization Characteristics In Applied Geophysical Studies
  
  Authors D. A. Clark and J. B. Emerson
More Less

Short-period geomagnetic variations recorded concurrently with an aeromagnetic survey across the Bendigo area, Victoria

Abstract

Most Read This Month

Most Cited This Month Most Cited RSS feed