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According to James Corum's mathematical analysis of the Zenneck wave,

"The resulting wave is a surface guided (single conductor) transmission line mode which attenuates exponentially along the guide. . . .  There is no inverse square spreading or diffraction, as with Hertzian waves. . . .  With appropriate constitutive parameters, a pure Zenneck wave would seem to hold out the promise of guided propagation with no radiation field to waste energy."

As the study of radio propagation progressed and certain mathematical analyses excluded it, some question as to the existence of Zenneck surface waves began to develop.  In 1937 limited support was given to these doubts after tests showed simple antennas driven at 150 mHz produced 100 times lower field strength than predicted.  More recent investigations show evidence that Zenneck waves can, indeed, be generated.  The lower the frequency, the lower are the propagation losses.  It is also apparent that they are not a major contributor to the field produced by an electric dipole or a quarter wave radiator, however they might be excited by an energetic quarter wave resonator.  To quote Hill and Wait,

"As it turns out, the Zenneck wave is generally difficult to excite with a realistic source because it has a rather slow decay with height above the earth's surface.  But there is still an open question whether other types of sources may not be more favorable. . . . An infinite vertical aperture with height variation corresponding to that of the Zenneck wave will excite only the Zenneck surface wave with no radiation field. . . ." [Hill, D. and J.R. Wait, "Excitation of the Zenneck Surface Wave by a vertical Aperture," Radio Science, Vol. 13, No. 6, November-December, 1978, pp. 969-977.]

And to once again quote Dr. Corum,

"The 1978 analysis provided by Hill and Wait examined the fields produced by a vertical sheet of horizontally directed magnetic current with an exponential variation in an 'infinite Zenneck" aperture. . . . The analysis . . . showed that this field has no intrinsic merit at 1 to 10 MHz, and we certainly agree.  One wonders, however (and this is pure conjecture at this point), if the disposition of Tesla's Colorado Springs high voltage (10-20 Mv) VLF resonator did, in fact, possess an effective vertical distribution of magnetic current which could launch a similar Zenneck Surface Wave. . . ."

Plots of field strength vs. frequency indicate that a Zenneck wave propagates best at ELF and VLF frequencies up to about 35 kHz and begins to lose its advantage as frequency rises above this point.

Predicted Zenneck wave field strength decrease for around-the-world propagation as a function of frequency in kHz.

The complex longitudinal propagation phase constant along the Earth's surface for the Zenneck surface wave.

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The Zenneck Surface Wave vs. the Norton Surface Wave


A 1/2-wave dipole antenna in free space--the Hertz antenna--approaches an ideal source of electromagnetic radiation emitted in the form of space waves.  These space waves can reach the receiver either by sky-wave propagation or by ground-wave propagation, the latter being the portion of the radiated space wave that propagates close to the earth's surface.  The ground wave has both direct-wave and ground-reflected components, and under certain conditions a tropospheric ducting component.  The direct-wave is limited only by the distance to the horizon from the transmitter plus a small distance added by atmospheric diffraction around the curvature of the earth.  The ground-reflected portion of the radiated wave reaches the receiving antenna after being reflected from the earth's surface.

There is also an induced ground-hugging surface-wave component known as the Norton surface wave.  This wave is the result of electrical currents induced in the ground by refraction of a portion of the reflected-wave component at the earth-atmosphere interface.  Upon reflection from the Earth's surface the reflected wave undergoes a 180deg phase reversal.  When both transmitting and receiving antennas are on, or close to, the ground, and the distance between them becomes great, the direct and reflected components tend to cancel out, and the resulting field intensity is principally that of this surface wave.  Because part of its energy is absorbed by the ground, the electrical intensity of the surface wave is attenuated at a much greater rate than inversely as the distance.  It is the conductivity of the underlying terrain that determines the attenuation of the surface-wave field intensity as a function of distance.  The ground currents of a vertically polarized surface wave do not short-circuit a given electric field but rather serve to restore part of the used energy to the following field.  The better the conducting surface layer, the more energy returned and the less energy absorbed. [Antennas and Radio Propagation, TM 11-666, Dept. of the Army, Feb. 1953, pp. 17-23.]

It is useful here to consider two additional forms of wireless telecommunications antennas or launching structures, the Marconi antenna, a vertical 1/4-wave monopole antenna element and the Tesla antenna, a vertical high aspect-ratio 1/4-wave helical resonator with large capacitive top loading and small overall height, compared to the electrical 1/4 wavelength.  In both cases the structure is base fed, and a ground connection is used.

The Marconi antenna is a modified 1/2-wave Hertz antenna adapted to the real-world conditions encountered in the construction of medium and low frequency transmitters.  These adaptations are imposed by the wavelength involved and the resulting physical dimensions required of the antenna.  The dipole antenna is modified in that its lower half, 1/4 wavelength long, exists only as a mirror image of its upper counterpart.  The resulting 1/4-wave vertical monopole antenna takes advantage of the fact that at lower frequencies the ground acts as a mirror for the radiated energy.  The ground reflects a large amount of the energy that is radiated downward from the antenna mounted over it.  In the physical construction of the ground connection is important to have as high a conductivity as possible.   The object is to provide the best possible reflecting surface for the energy radiated downward from the antenna.  The ground consists of a number of bare conductors arranged radially and connected, 1/2 wavelength long, buried a short distance beneath the earth's surface.  In practice these conductors may act as part of the reflecting surface as well as making the connection to ground itself.   An alternative type of ground is the counterpoise.   It is a wire structure erected a short distance above the ground, and insulated from the ground.  The counterpoise operates by virtue of its capacitance to the ground.   Not unlike the Hertz antenna, the Marconi antenna is a source electromagnetic radiation in the form of space waves.

The Tesla antenna is a form of wireless antenna or wave launching structure developed by Tesla in which the transmitted energy propagates or is carried to the receiver by a combination of electrical current flowing through the earth, electrostatic induction and electrical conduction through plasma with an embedded magnetic field.  Of course it is also part of an electric dipole, consisting of the elevated capacitance, the helical resonator and master oscillator plus connections, and the Earth itself.  The above-ground structure is not intended as a source of electromagnetic radiation, rather, it is designed to minimize the production of electromagnetic radiation.  The principle that the ground acts as a mirror, which reflects electromagnetic energy radiated downward by the antenna mounted over it, is not applicable.

In operation, the Tesla launching structure induces an electrical current in the earth between the transmitting and receiving stations, along with an associated surface wave, that propagate the transmitted energy.  A conducting path is also establish through the rarified upper level atmosphere between the transmitting and receiving stations elevated high voltage terminals, leading Tesla to coin the term "disturbed charge of ground and air method."  He stated that this method involves electrical conduction and that energy escapes from the system in the form of electromagnetic radiation.  The conducting media are the earth and the atmosphere above 5 miles elevation.  While the region from 5 miles up to the ionosphere is not an ohmic conductor, the density or pressure is sufficiently reduced to so that, according to Tesla's theory, the atmosphere's insulating properties can be easily impaired allowing an electric current to flow.  His theory further suggests that the conducting region is developed through the process of atmospheric ionization, shifting the effected portions thereof to a plasma state.  A magnetic field is developed by each plant's helical resonator, meaning that an embedded magnetic field is also involved.  The atmosphere below 5 miles is also viewed as a propagating medium for a portion of the above ground circuit, and being an insulating medium, electrostatic induction or 'displacement current' would be involved rather than true electrical conduction.  Tesla felt that with a sufficiently high electrical potential on the elevated terminal the practical limitation imposed upon its height could be overcome.  He anticipated that a highly energetic transmitter would charge the elevated terminal to the point where the atmosphere around and above it would break down and become ionized, leading to a flow of true conduction currents between the two terminals through the troposphere path connection.

Now, Sommerfeld described an electrodynamic wave that is guided along a wire of finite conductivity and Zenneck expanded upon this description, asserting that the earth's surface performs in a manner similar to a conducting wire.  And, while the Norton Surface Wave is the result of electrical currents induced in the ground by refraction of a portion of the reflected-wave component of the ground-wave at the earth-atmosphere interface, the surface wave associated with Tesla's apparatus is the result of electrical ground currents flowing between two discrete points on the earth's surface.  Unlike the lossy Norton surface-wave that is excited by a conventional AM radio transmitter it would seem that Tesla's surface wave would not diminish quite as significantly as the distance from the source facility increases.  [See "A Comparison of the Tesla and Marconi LF Wireless Systems"]

[This piece is derived from "The Zenneck Surface Wave," Appendix II of the paper entitled "Nikola Tesla, Lightning Observations and Stationary Waves" by K. L. Corum and J. F. Corum, Ph.D. 1994., presented at the 1994 Colorado Springs Tesla Symposium.  This and other papers are available through PV Scientific Instruments' Tesla Reprint Page.  See also The Purpose of the Wardenclyffe Tower.]

https://papago.naver.net/website?source=en&target=ko&url=http://www.tfcbooks.com/articles/tws4.htm

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Understanding Lightning: Return Stroke

The return stroke is the very bright visible flash that we see as lightning, caused by the rapid discharge of electricity. Once the step leader makes contact with a streamer, the negative charge that has accumulated along the leader channel flows rapidly to ground. The movement of the charge starts at the point of contact and rapidly works its way upward as charge is drained from the channel
(Figure 1.
https://www.weather.gov/images/safety/Animation/Animation_11a.gif

Although the visible flash is associated with the rapid movement of charge downward, the actual flash propagates upward throughout the channel as the negative charge starts moving toward the ground (Figure 2).
https://www.weather.gov/images/safety/Animation/Animation_12a.gif

This is similar to cars that have been stopped by an open drawbridge. Once the drawbridge is opened for traffic, cars initially start moving forward toward the bridge but movement across the bridge works its way backward through the line of stopped cars. For a moment after the initial return stroke, the channel remains conductive and can be a favored path for subsequent downward leaders.
https://www.weather.gov/safety/lightning-science-return-stroke

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I made a special yoke transformer, but it did not work.
I could not understand.
So I thought a special yoke transformer was not special.
For a while ....

And while I was doing various experiments, I realized that a special yoke transformer only works on a special grounding mechanism.

And Experiment End.


Negative electric charge Positive electric charge exists everywhere on earth.
However, the Zenneck Surface Wave stole the Return Stroke of the lightning.

With patent and money ...


오렌지색 모자를 꽃으로 착각하는 벌새...
https://ncache.ilbe.com/files/attach/new/20190224/377678/960772955/11035623366/020eb8d26d938b4ba15c0e3f8ace261f.gif

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https://www.youtube.com/watch?v=AWUQJyNly5c&t=0s

There are many people who are mortgaged to the brightness of light sensitivity.
This is your will that light has caused.
Is it the will of darkness?
Who will save you if you fall into your own lake?
Many people waste their thoughts and time on meaningless things.
https://www.youtube.com/watch?v=hx1RMqcZefg
Of course, the instinctive dance of moths flying toward the torchlight is wonderful.

Is the exit strategy still far away?
https://www.youtube.com/watch?v=4cxi531CmQo
https://www.youtube.com/watch?v=h0K1FltsXrM
https://www.youtube.com/watch?v=8clm_FxSKRU