Method for determination of interfaces formed by inversions of geomagnetic field

FIELD: geophysics, in particular, paleomagnetism.

SUBSTANCE: the position of the interfaces formed by inversions of the geomagnetic field is determined by pulse radar detection and ranging of the magnetic field with the aid of radar units with a power potential of 500 to 600 dB. The radiating and receiving devices of the radar units include horizontal magnetic dipoles. The interfaces are separated by comparison of the data of pulse radar detection and ranging of the magnetic field and pulse radar detection and ranging of the electric field.

EFFECT: remote determination of interfaces formed by inversions of the geomagnetic field in ice layers, enhanced depth of survey.

 

The invention relates to the physics of the earth's crust, in particular to paleomagnetism.

There is a method of determining the position of the boundary formed by the inversion of the geomagnetic field in the strata of rocks, using the selection-oriented rock samples from outcrops, wells and other excavations and further determine the direction vector of the residual magnetization in the laboratory [1]. The prototype.

The disadvantages of this method for studying boundary formed by inversion of the geomagnetic field in rocks, ice, are:

the need is not always technically possible (without drilling CBM wells) labor-intensive operations - oriented selection of samples, especially when considering the large areas;

- difficulties laboratory study of the magnetization of ice because it is very small.

Examples of paleomagnetic studies of ice in the scientific literature are missing.

The technical problem is in the remote definition of the boundary formed by the inversion of the geomagnetic field in rocks, ice, ice sheet and other Arctic ice sheet without sampling.

We propose a method of determining the boundaries of the partition formed by the inversion of the geomagnetic field in rocks, ice, ice sheets and other top polar glaciers, characterized in that the position of these boundaries determine remotely the radar pulses of the magnetic field with the use of radar energy capacity 500-600 dB, with the composition of the emitting and receiving devices of the horizontal magnetic dipoles, and distinguish them, among others, by comparing the data of the radar pulses of the magnetic field and the radar pulses of electric order.

Introduced in the claims of this essential element, as the radar, allows remote positioning of the study boundaries.

Introduced in the claims of this essential element, as the radar pulses of the magnetic field with application to create and register a horizontal magnetic dipoles allows remote positioning of the boundary, which only changes the magnetic permeability.

Introduced in the claims of this essential element, as the radar pulses of the magnetic field of the radar station (radar) energy capacity 500-600 dB, allows you to set the position of the boundary section low-contrast environments and repeatedly to increase the depth of study in comparison with the radar pulses of an electric field.

Introduced in the claims of this essential element, as simultaneous radar pulses of magnetic and electric fields, allows you to allocate additional area boundaries are those which are formed by inversion of the geomagnetic field, as radiologists is her pulses of an electric field, they are not detected.

The method is as follows. Performed simultaneously or alternately radar pulses of magnetic and electric fields either in the profile or in motion on the earth's surface or from the air. Radar for sensing a magnetic field pulses contains a horizontal magnetic dipoles in sluchayem and receiving devices, the generator of the magnetic moments based superconductors and SQUID-magnetometer, which allows to increase the energy potential of radar to 560 dB, and when working with the accumulation of the reflected signals up to 600 dB [3]. At the interface, the corresponding magnetic inversion, in homogeneous for all other parameters thicker ice with a residual magnetization of Jnin apologetic on the experience of the assumption that the magnetic field strength H after inversion largest fully restored, the effective magnetic permeability of rocks varies from μ1=l+4π (Jn/H+χ )H μ2=1+4π (Jn/H+χ )H (here χ - magnetic susceptibility). Here the boundary changes and the impedance in the field of sufficiently high frequency from √ μ1/εto √ μ2/ε. This boundary is sharp, since the time of its formation and the rate of accumulation of masses of ice, a separate lawsuit what ucheniyami local character, in the geological time scale is small. Omitting the calculations, will receive approximately that the reflection coefficient R=2π Jn. Ice refers to the number of diamagnetic substances. Due to the fact that it contains particles of cosmic origin, fine products of volcanic eruptions, including distant captured in the course of accumulation of gaseous substances and in coastal areas salt contained in sea water, ice accumulation becomes remanence Jnthough obviously small. For simplicity, suppose Jn=10-5/2π . Then R=10-5and loss (-20 lgR) is equal to 100 dB. The main loss - absorption on the way 2h and back - equal 2hN, where N is the specific absorption of electromagnetic pulse, equal to the polar glaciers 0.1 dB/m [2]. The total loss in decibels include more losses due to divergence of the wave front is equal to 5+20 lgh, the total loss on the scattering and depolarization wave, given its focus, the equal of 40.7 dB [2]. Hence, taking into account all losses, possible depth definition of the boundary formed by the inversion of the geomagnetic field, in a uniform thickness of ice at the energy potential 560 dB can reach 1700 m, with the increase of the power capacity of up to 600 dB - 2000 m Using aerial vehicles (loss when you double-crossing the border without the x - the earth is ~ 20 dB) reduces the depth of research before 1500 and 1800 m, respectively. In a land-based version of the survey depth can be increased by placing a sensor receiving device in existing or specially drilled hole. The energy potential of radar that uses pulses of the electric field is ~ 150 dB. Obviously, the signals reflected from the boundary formed by the inversion of the geomagnetic field, the radar pulses of the electric field cannot be detected. Hence the comparison of the data of the radar pulses of magnetic and electric fields allows you to select these boundaries, to trace them on the ground and to determine the depth of their location.

The advantage of the proposed method is remote detection, the selection among the other boundary formed by inversion of the geomagnetic field, and determining their position in the middle of the ice.

Sources of information

1. The magnetic survey (Handbook of Geophysics). M.: Izd. "Nedra", 1980 - 367 S. (see s and later).

2. Vsohotki, Bently, Goodmansen. Radiopathology. Leningrad: Gidrometeoizdat, 1983. - 312 S.

3. Usacapoc, Svjatopol. The sensing of the terrestrial environment by magnetic field pulses. //DAN, 2002. t, No. 6. S-817.

The method for determining the boundary formed by the inversion of the geomagnetic field in rocks, ice, ice sheets and the other covering the polar glaciers, characterized in that the position of these boundaries determine remotely the radar pulses of the magnetic field with the use of radar energy capacity 500-600 dB which has the emitting and receiving devices of the horizontal magnetic dipoles, and distinguish them, among others, by comparing the data of the radar pulses of the magnetic field and the radar pulses of an electric field.



 

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