3-11 July 2007
Merida, Mexico
Mexico/General timezone
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SH 5.3

Place

Location: Merida, Mexico
Room: Yucatan I (Fiesta Americana)
Date: 10 Jul 12:05 - 13:30

Conveners

    • Dr. Burger, Renier (North-West University)

Timetable | Contribution List

Displaying 7 contributions out of 7
Type: Oral Session: SH 5.3
Track: SH.5.3
The subsonic heliosheath beyond the termination shock (TS) of the solar wind plays a profound role in the transport of anomalous (ACR) and galactic cosmic rays (GCR). The energetic particle observations of Voyager-1, after crossing the TS in December 2004, indicate that the distribution of ACR is not uniform in the heliosheath. We point out that our concepts based on a simple 1-D shock canno ... More
Presented by Dr. Jozsef KOTA on 10/7/2007 at 17:41
Type: Oral Session: SH 5.3
Track: SH.5.3
Voyager 1 observations at the termination shock and in the heliosheath revealed new phenomena which required rethinking of some of our established paradigms. Very important among the new factors is the temporal and probably spatial variations which produce a number of effects which affect the energetic-particle spectra, anisotropies and their time variations observed at Voyager1. ... More
Presented by Prof. Jack (Randy) JOKIPII on 10/7/2007 at 17:29
Type: Oral Session: SH 5.3
Track: SH.5.3
A numerical model, based on Parker’s transport equation, is utilized to investigate several aspects of the modulation of cosmic rays and the anomalous component beyond the solar wind termination shock (TS), in particular in the heliosheath, in the nose direction of the heliosphere. These aspects include: The latitude dependence of (1) radial perpendicular diffusion, the dominant diffu ... More
Presented by Prof. Marius POTGIETER
Type: Oral Session: SH 5.3
Track: SH.5.3
The origin of anomalous cosmic ray ions has long been assumed to be heliospheric pickup ion production from interstellar neutrals and acceleration at the solar wind termination shock. The Voyager-1 shock crossing showed a well-defined boundary for sharply increased keV ion fluxes in the heliosheath but no sign of local acceleration. Ion flux spectra at keV to MeV energies are instead unfolding ... More
Presented by Dr. John F. COOPER on 10/7/2007 at 17:05
Type: Oral Session: SH 5.3
Track: SH.5.3
Stochastic acceleleration has been unimportant inside the solar wind termination shock. This is due to the fact that, its characteristic time is much larger than the time for particle propagation in this region. However, in the heliosheath, where the turbulence in the heliospheric magnetic field increases with the radial distance and the solar wind speed decreases as it moves out, the accelera ... More
Presented by Prof. Harm MORAAL on 10/7/2007 at 18:05
Type: Oral Session: SH 5.3
Track: SH.5.3
Anomalous cosmic ray spectra, observed by Voyager 1 at the solar wind terminatiuon shock crossing, were not of the form expected of first order Fermi (or shock) acceleration, but gave an indication that they were modulated relative to that form. Further data analysis reveals two other remarkable features, namely that the energy where the peak ACR intensity occurs is about four times high ... More
Presented by Dr. Rogelio CABALLERO-LOPEZ on 10/7/2007 at 17:17
Type: Oral Session: SH 5.3
Track: SH.5.3
The transport and acceleration of a few-MeV anomalous cosmic rays in the heliosheath is studied. We show that the compression of the solar wind (due to charge exchange) result in adiabatic acceleration of these particles. Furthermore, anomalous cosmic rays also experience acceleration of a stochastic nature in the inner heliosheath. Comparing numerical model results with Voyager 1 cosmic ... More
Presented by Dr. Stefan FERREIRA on 10/7/2007 at 17:53
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