EINMUF: An HF MUF, FOT, LUF Prediction Program

Abstract

This work describes a FORTRAN algorithm, called Subroutine EINMUF, which predicts the Maximum Usable Frequency (MUF), the Frequency of Optimum Transmission (FOT), and the Lowest Usable Frequency (LUF) on a specified HF communications path. A single call to EINMUF produces up to 24 predictions at hourly intervals starting with a specified day-time group DTG. MOF calculations are made with the NOSC MINIMUF85 MUF-prediction program using the first available sunspot number SSN from the following list: (a) an effective SSN derived from current oblique-incidence sounder data; (b) a 5-day running average of SSNs derived from solar 10.7 cm flux measurements or direct SSN measurements; (c) an effective SSN determined from old sounder data; (d) SSN extrapolated from previous SSN measurements by the McNish-Lincoln method; (e) SSN derived from a mean-value representation of the 11-year solar sunspot number cycle. Keywords: Electromagnetic compatibility; High Frequency(HF); Ionospheric propagation; Propagation prediction; Sounder updating.

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Document Details

Document Type
Technical Report
Publication Date
May 18, 1990
Accession Number
ADA221577

Entities

People

  • Mark Daehler

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • C4I
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Algorithms
  • Classification
  • Environment
  • Extrapolation
  • Frequency
  • High Latitudes
  • Interpolation
  • Intervals
  • Ionosphere
  • Ionospheric Propagation
  • Latitude
  • Longitude
  • Measurement
  • Procedures (Computers)
  • Security
  • Space Environments
  • Transmitters

Readers

  • Maritime and Naval Warfare Studies
  • Space/Atmospheric Physics.