Alternative Standard Frequencies for Interstellar Communication

TL;DR

This paper proposes alternative standard frequencies for interstellar communication that avoid interference from galactic hydrogen, providing unbiased options for SETI signal searches.

Contribution

It introduces several new standard frequencies free from atomic or molecular interference, offering unbiased alternatives to the 21 cm hydrogen line.

Findings

Identified frequencies free of galactic hydrogen interference

Proposed standards are universally recognizable and unbiased

Enhances SETI search strategies by reducing background noise

Abstract

The 21 cm hydrogen line is considered a favourable frequency by the SETI programme in their search for signals from potential extra-terrestrial civilizations. The Pioneer plaque, attached to the Pioneer 10 and Pioneer 11 spacecraft, portrays the hyperfine transition of neutral hydrogen and used the wavelength as a standard scale of measurement.Although this line would be universally recognized and is a suitable wavelength to look for radio signals from extraterrestrials, the presence of ubiquitous radiation from galactic hydrogen could make searches a little difficult. In this paper we suggest several alternate standard frequencies which is free of interference from atomic or molecular sources and is independent of any bias.