Other
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp22a08t&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SP22A-08
Other
2104 Cosmic Rays, 2114 Energetic Particles, Heliospheric (7514), 7522 Helioseismology
Scientific paper
In two recent papers (JGR) we have reported on low (microHz) frequency variations in interplanetary magnetic fields and charged particles fluxes (near-relativistic electrons and galactic cosmic rays - GCR) measured on spacecraft. Using time series analysis techniques and statistical procedures, we have shown that as much as 50% or more of the power in interplanetary magnetic field fluctuations is in low frequency modes. We have also shown that there is a coherence between the near-relativistic electron fluxes and the GCR at a frequency of ~ 5.2 microHz. We have suggested that such modes have their origins in the Sun. In this paper we further examine the role of low frequency modes as a control of the heliosphere. We report a study of the coherence between the time series of spacecraft-measured GCR and ground-based neutron monitor data. We find confirmation of the mode at ~ 5.2 microHz in the coherence between these two time series, as well other coherences at lower frequencies, such as at periods of ~ 70 and ~ 94 days. The analysis techniques easily identify the offset in the two time series due to the motion of the Earth relative to the spacecraft.
Lanzerotti Louis J.
Maclennan Carol G.
Thomson David J.
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