Stability of the zodiacal light from minimum to maximum of the solar cycle /1974-1981/

Details Stability of the zodiacal light from minimum to maximum of the solar cycle /1974-1981/ Stability of the zodiacal light from minimum to maximum of the solar cycle /1974-1981/

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...110..111l&link_type=abstract

Astronomy and Astrophysics, vol. 110, no. 1, June 1982, p. 111-114. Bundesministerium für Forschung und Technologie

Astronomy and Astrophysics

Astrophysics

9

Helios Project, Luminous Intensity, Polarized Light, Solar Activity Effects, Solar Cycles, Zodiacal Light, Astronomical Photometry, Celestial Reference Systems, Interplanetary Magnetic Fields, Plasma Clouds, Plasma Density, Polarimetry, Secular Variations

Scientific paper

In order to demonstrate the stability of zodiacal light, observations made with the Helios 1 and 2 space probes over the time interval December 1974 through July 1981 are presented. This interval covers the rising part of solar cycle 21, characterized by a very quiet minimum in June 1976 and a quite strong maximum in November 1979. Data evidencing the stability of the photometers is shown, along with an example from the data base from which the results are derived. The stability of zodical light intensity and polarization is also depicted. It is concluded that two percent for the intensity and 0.01 for polarization are reasonable upper limits for a suspected solar cycle variation, showing that the interplanetary particles producing the zodiacal light are at most weakly influenced by interplanetary plasma and magnetic fields. It is hypothesized that the zodiacal light, if properly measured, is a stable reference.

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