Comparison of VLF Wave Activity in the Solar Wind during Solar Maximum and Minimum: Ulysses Observations

Naiguo Lin, P. J. Kellogg, R. J. MacDowall, D. J. McComas, A. Balogh, R. J. Forsyth

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We have compared observations of VLF waves (0.2 to 448 Hz) made by Ulysses during its second fast latitude scan (near the solar maximum) with the wave observations during the first fast latitude scan in 1995, when the solar activity was approaching a minimum. The occurrences and properties of the waves are found to be similar during the solar maximum and solar minimum periods for slow and intermediate speed solar wind. The maximum intensity of the electromagnetic waves for the two solar cycle periods is comparable. These similarities suggest that the plasma conditions for the waves' excitation are similar for the slow and intermediate solar wind in both solar maximum and minimum phases. It is also found that the electric field noise detected in the low band channels, which are measuring less than 9 Hz signals, is contaminated by the spin modulation of the electric field due to photoelectrons around the spacecraft, especially when the ambient plasma density is low. This noise increases with increasing solar aspect angle.

Original languageEnglish (US)
Title of host publicationSolar Wind Ten
Subtitle of host publicationProceedings of the 10th International Solar Wind Conference
EditorsMarco Velli, Roberto Bruno, Francesco Malara
PublisherAmerican Institute of Physics Inc.
Number of pages4
ISBN (Electronic)0735401489
StatePublished - Sep 2 2003
Externally publishedYes
Event10th International Solar Wind Conference - Pisa, Italy
Duration: Jun 17 2002Jun 21 2002

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


Other10th International Solar Wind Conference

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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