QUIET-TIME HELIOSPHERIC PARTICLE FLUXES
Pre-Conference Workshop, 29 July, 14:00-18:00, Durban
Programme
25TH INTERNATIONAL COSMIC RAY CONFERENCE
Conveners:
Péter Király (Budapest) and Horst Kunow (Kiel)
Scope
Under the present solar minimum conditions, it is particularly timely
to discuss various aspects of quiet-time energetic particle
populations. In the sub-MeV to MeV energy ranges particle fluxes in
the inner heliosphere vary by several orders of magnitude both over
the solar cycle and over shorter periods. Variations are also
considerable at lower and higher energies. Most attention is usually
given to 'peak' fluxes, but 'holes' and quasi-stationary periods have
important implictions as well. Admittedly, holes are harder to study
due to poor statistics and to instrumental and other background
effects. Those difficulties have prevented so far getting a clear
picture of the origin of quiet-time fluxes. In this workshop
observational, interpretative and theoretical aspects will be
discussed, together with supporting evidence from other related
fields.
The Quiet-Time project at ISSI
A working group of the International
Space Science Institute (ISSI)
in Bern is concentrating efforts on understanding certain aspects of the
properties and origin of quiet-time fluxes. The collaboration
includes several principal and co-investigators of the SOHO, Ulysses
and Interball missions. Long-term variations, based on IMP results,
have also been covered. A
4-day mini-symposium has been held at ISSI late in June and its
conclusions
will also be discussed in Durban.
- P. Király:
Account on the quiet-time workshop at ISSI, June 25-28, 1997
- H. Kunow, V. Bothmer, R. Müller-Mellin, H. Sierks:
Variation of the MeV particle background level as observed with the
COSTEP/EPHIN instrument during 1996
- H. Sierks, V. Bothmer, R. Müller-Mellin, H. Kunow, A. Posner:
The MeV particle background of the SOHO/COSTEP/EPHIN instrument
- J. Torsti, P. Maekelae, M. Teittinen and E. Valtonen:
Contribution of anomalous cosmic rays to the quiet time fluxes as observed
by SOHO/ERNE
- E. Keppler: Low energy ion intensity during 1996/97
- J. Kóta: Adiabatic cooling and acceleration in the heliosphere
- B. Blake: Some quiet-time results on SAMPEX
- B. Klecker, A. Bogdanov, D. Hovestadt, and M. Hilchenbach: Low energy
quiet-time fluxes in solar cycle 21 and 22 as observed with ISEE-3,
SAMPEX, and SOHO
- J. Rodriguez-Pacheco:
Summary of the results on quiet-time periods obtained from the DFH
experiment on-board ISEE-3 during the solar maximum period of solar cycle 21
- K. Kudela, M. Slivka, V.N. Lutsenko and E.T. Sarris: Fluxes of >= 30 keV
ions and electrons: statistical study out of the Earth's bow shock
(Interball-1 data)
- All: Discussion and conclusions
The workshop was attended by about 35 participants; in addition to the
above talks, there were two short presentations (by Yu. Stozhkov and
S.M. Krimigis), and a lively discussion.
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