Orbital Noise of the Earth Causes Intensity Fluctuation in the Geomagnetic Field

Abstract

Orbital noise of Earth's obliquity can provide an insight into the core of the Earth that causes intensity fluctuations in the geomagnetic field. Here we show that noise spectrum of the obliquity frequency have revealed a series of hquency periods centered at 250-, lOO-, 50-, 41-, 30-, and 26-kyr which are almost identical with the observed spectral peaks from the composite curve of 33 records of relative paleointensity spanning the past 800 kyr (Sint-800 data). A continuous record for the past two million years also reveals the presence of the major 100 kyr periodicity in obliquity noise and geomagnetic intensity fluctuations. These results of correlation suggest that obliquity noise may power the dynamo, located in the liquid outer core of the Earth, which generates the geomagnetic field.

Effective privacy amplification for secure classical communications

“…Currently there are three classical secure key distribution methods which have been published; in chronological order: the Kirchhoff-Law-Johnson-(like)-Noise (KLJN) [4][5][6][7], the Ultra-long-Fiber-Laser (UFL) [8][9][10][11], and the Pao-Lo Liu (Liu) [12][13][14] schemes. In all these schemes, Alice and Bob are interacting with the channel via a classical physical quantity while they are monitoring some properties of the channel (i.e.…”

“…Similarly, in the Liu scheme [12][13][14], there is some information about the bits of Alice and Bob in the interrelation of the signals sent/reflected by Alice and Bob, respectively [12][13][14]21].…”

“…In attempt to resolve this loophole, much effort has been focused on the development of physical-layer key-distribution scheme. Quantum key distribution (QKD) [2,3] is probably the most well known scheme although recently, alternative concepts employing classical physics have been proposed and demonstrated [4][5][6][7][8][9][10][11][12][13][14]. For example, the demonstration of the Kirchhoff-Law-Johnson-(like)-Noise based key distribution system at 2000km range resulted in 99.98% fidelity [6], or recent studies on ultralong fiber laser classical key distribution schemes have demonstrated ranges exceeding 200km with potential key establishing rates of hundreds bits per second [15].…”

“…The length of the new key is half of that of the original one but Eve's knowledge on the new key is substantially reduced (see section 3). We mathematically analyze this simple algorithm and show for the three existing classical key-distribution schemes [4][5][6][7][8][9][10][11][12][13][14] that a practically satisfactory approach of 0.5 (i.e., zero information) can be reached by 4-8 times slowdown for the state-of-the-art physical realizations of these systems. Notice that for eavesdropper probability 0.5, Eve obtains indeed zero information on the key because this probability is equal to generating her own key bits by using an unbiased random coin.…”

Coexisting stochastic and coherence resonance in a mean-field dynamo model for Earth’s magnetic field reversals

“…The underlying physical mechanism was identified as the stochastic resonance (SR) [20], which is an example of noise-induced phenomena in nonlinear systems driven by weak periodic forcing. For the geodynamo, the weak periodic forcing is actually assumed to result from the Milankovich cycle of the Earth's orbit eccentricity [21,22], although details of the driving mechanism are hard to quantify from first principles.…”