Open AccessPeriodicity in the solar wind velocity, temperature and number density
Author(s) -
Das T. K.,
Ghosh M. K.
Publication year - 1999
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.1999.02940.x
Subject(s) - physics , solar wind , spectral density , earth's magnetic field , solar physics , solar maximum , astrophysics , satellite , wind speed , coronal mass ejection , atmospheric sciences , computational physics , astronomy , meteorology , magnetic field , statistics , mathematics , quantum mechanics
The harmonic behaviour of the solar wind velocity, temperature and number density is investigated by analysing data from the Pioneer XII satellite operated during the period 1980–87. Power spectral analyses of six Fourier series formed from these observed data give a periodicity of 37 d for both the solar wind velocity and the temperature, but show a periodicity of 14 d in the solar wind number density. These periodic values are found to be similar to those obtained in the case of proton fluences and geomagnetic activity reported previously, and could also act as a diagnostic of solar eruptions that have harmful effects on orbiting satellites.