We review the state of current understanding of the potential for interference and interruption of service of wireless communications systems due to solar radio bursts. There have been several reported instances of an enhanced rate of dropped cell-phone calls during solar bursts, and the design of current base station systems make them vulnerable to problems near sunrise and sunset for antennas facing in the direction of the Sun during outbursts.

The transfer matrix of a finite elastic bar is derived and the reflection and transmission functions are obtained. The matrix formalism is combined with Fourier component decomposition and applied to simulate acoustic pulse propagations in elastic inhomogeneous periodic and finite media. The numerical results are compared with experimental data to conclude about the validity of this method.

Analysis of 412 solar radio burst events in the microwave range [1.2–18] GHz that were measured at the New Jersey Institute of Technology Owens Valley Solar Array over 2 years (2001–2002) during the peak of the 23rd solar cycle is conducted in the context of the possible interference of such bursts with radio-receiving and radar systems that operate at these frequencies. It is found that there is a small probability for solar interference for

For a nearest-neighbor Ising model on a square lattice all cluster configurations with 17 or fewer spins are identified. In neglect of cluster-cluster interactions, critical sizes and barriers to nucleation are obtained as functions of temperature and magnetic field for two alternative definitions of a "critical cluster."

We investigate the properties of radio bursts observed in the 1–18 GHz frequency range that display two distinct spectral components peaking at decimetric (dm) and centimetric (cm) ranges. The dm emission is relatively smooth in both frequency and time, with timescales comparable to those of the cm component. The two spectral components display specific correlations in their temporal and spectral behavior. Through detailed analysis, we find the

Two original algorithms used to generate n-element clusters in a rectangular lattice are presented. The first algorithm, suitable for simulations related to thermodynamic investigations of metastable cluster systems [V.A. Shneidman, G.M. Nita, On the critical cluster in the 2-dimensional Ising model: computer-assisted exact results, J. Chem. Phys. 121 (11232) 2004], is able to generate all distinguishable cluster configurations with a given number

Solar radio bursts were first discovered as result of their interference in early defensive radar systems during the Second World War (1942). Such bursts can still affect radar systems, as well as new wireless technologies. We have investigated a forty-year record of solar radio burst data (1960–1999) as well as several individual radio events in the 23rd solar cycle. This paper reviews the results of a portion of this research. Statistically,

This paper describes the design and operation of the Frequency-Agile Solar Radiotelescope (FASR) Subsystem Testbed (FST) and the first observational results. Three antennas of the Owens Valley Solar Array have been modified so that each sends a 1–9 GHz band of radio frequency to a central location using a broadband analog optical fiber link. A dynamically selected 500 MHz subset of this frequency range is digitized at 1 Gsps (gigasample per second)

The propagation of acoustic or ultrasonic pulses and waves in 1-D media with continuous inhomogeneities due to spatial variations in density, Young modulus, and/or cross section of the propagation medium is discussed. A semianalytical approach leads to a general form of the solution, which can be described by a function, whose Taylor expansion is absolutely convergent. The special case of a periodic inhomogeneity is studied in detail and the dispersion

A metastable lattice gas with nearest-neighbor interactions and continuous-time dynamics is studied using a generalized Becker-Döring approach in the multidimensional space of cluster configurations. The preexponential of the metastable-state lifetime (inverse of nucleation rate) is found to exhibit distinct peaks at integer values of the inverse supersaturation. Peaks are unobservable (infinitely narrow) in the strict limit T→0, but become detectable