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Synoptic maps for the heliospheric Thomson scattering brightness as observed by the Helios photometersA method for displaying the electron Thomson scattering intensity in the inner heliosphere as observed by the zodiacal light photometers on board the Helios spacecraft in the form of synoptic maps is presented. The method is based on the assumption that the bulk of the scattering electrons along the line of sight is located near the point closest to the sun. Inner-heliospheric structures will generally be represented properly in these synoptic maps only if they are sufficiently long-lived (that is, a significant fraction of a solar rotation period). The examples of Helios synoptic maps discussed (from data in April 1976 and November 1978), indicate that it is possible to identify large-scale, long-lived density enhancements in the inner heliosphere. It is expected that the Helios synoptic maps will be particularly useful in the study of corotating structures (e.g., streamers), and the maps will be most reliable during periods when few transient featurs are present in the corona, i.e., during solar minimum.
Document ID
19910052736
Document Type
Reprint (Version printed in journal)
Authors
Hick, P. (Max-Planck-Institut fuer Aeronomie, Katlenburg-Lindau, Federal Republic of Germany; California, University La Jolla, United States)
Jackson, B. V. (California, University La Jolla, United States)
Schwenn, R. (Max-Planck-Institut fuer Aeronomie Katlenburg-Lindau, Federal Republic of Germany, United States)
Date Acquired
August 15, 2013
Publication Date
April 1, 1991
Publication Information
Publication: Astronomy and Astrophysics
Volume: 244
Issue: 1 Ap
ISSN: 0004-6361
Subject Category
SOLAR PHYSICS
Funding Number(s)
CONTRACT_GRANT: BMFT-WRS-0108
CONTRACT_GRANT: NSF ATM-88-12409
CONTRACT_GRANT: NAGW-2002
Distribution Limits
Public
Copyright
Other