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Showing 1 to 19 of 19 for “"heliosphere"”.
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Evolution of coronal mass ejections through the heliosphere
… bow shocks and the termination shock in the heliosphere. A comparative study of these shocks and corresponding sheaths reveals some universal processes, such as temperature anisotropy instabilities, magnetic field draping and plasma depletion. These results underscore important physical …
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Topics in Energy Release and Particle Acceleration in the Heliosphere
This thesis investigates both the release of energy in solar flares, and the acceleration and transport of particles in various astrophysical situations. While numerical simulations are central to this thesis, these are always motivated by analytical arguments. A review of flare energy release is …
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Modeling and Observation of He+ Pickup Ions in the Inner Heliosphere
… originates from interstellar neutrals inside the heliosphere. They are produced by photoionization, charge exchange with solar wind ions, and electron impact ionization (EI). Once ionized, they are picked up by the interplanetary magnetic field (IMF) and rapidly swept outward with the solar wind. …
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Consequences of ancient near-Earth supernovae on the heliosphere and throughout the solar system
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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A numerical investigation of the interaction of the heliosphere with the local interstellar medium
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1998.
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Diagnostics of solar flare energetic particles: neglected hard X-ray processes and neutron astronomy in the inner heliosphere
… neutron fluxes to be encountered by future inner heliosphere space missions.
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Resonant wave-ion interactions in the heliosphere: I. Interplanetary traveling shocks, II. Ion heating and acceleration in the extended corona
<p>In Part I we present a revised version of the self-consistent theory of ion diffusive shock acceleration and associated generation of hydromagnetic waves at a planar stationary shock. Coupled wave kinetic and energetic particle transport equations are solved numerically and compared with an …
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Magnetic reconnection physics in the solar wind with Voyager 2
… perform similarly to ad hoc studies in the inner heliosphere. Based on this technique, I present a survey of 138 outflow jets for the Voyager 2 spacecraft mission, including the most distant in situ evidence of reconnection discovered to date. Reconnection in the solar wind is shown to be strongly …
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Double streaming at 35 AU during the coronal mass ejections of March 1991
… from the Sun to 1 AU and then into the outer heliosphere. Of the many characteristics observed, we are especially interested in the double-streaming proton events seen at Voyager 2 in June 1991 over a two day period. Such pronounced double-streaming has not previously been reported to be a …
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Long-term variation in cosmic-ray modulation
The transport of cosmic rays inside the heliosphere can be described b the Parker equation (Parker, 1965). Since there are no full analytica solutions to the Parker equation, two first-order approximate solutions o the equation can be derived, namely the Convection-Diffusion and th Force-Field …
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SOLAR MODULATION OF GALACTIC COSMIC RAYS: TECHNIQUES & APPLICATIONS (SHOCK ACCELERATION, ANTIPROTONS)
… the effects of a strong termination shock in the heliosphere. In the end, high-energy particles cooling down in the upstream solar wind overwhelmed any accelerated low-enegy particles, those which would be most affected by the shock. The overall effect of a shock on the near-Earth spectra seems …
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Ion-Cyclotron Resonance Heating of O+ in the Topside Ionosphere and Mapping Outflows to the Magnetosphere
… and ionosphere, other planets, or the heliosphere.</p>
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Development and Characterization of a Fast Neutron Imaging Telescope (FNIT) for 1--20 MeV Neutrons From the Sun and Nuclear Material
… These measurements can only be made in the inner heliosphere due to the finite neutron lifetime and flux divergence as they leave the Sun. Additionally, the field of nuclear security has interest in an instrument that can detect, measure, and locate sources of (<10 MeV) neutrons from nuclear …
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Interstellar helium pickup ion flux variations observed with SOHO/CELIAS
… are formed when neutral atoms freely enter the heliosphere and are subsequently ionized. Once these particles are charged they become a component of the interplanetary plasma and are transported outward with the solar wind (SW). Measurements of these particles give information about the local …
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Investigating our dynamic solar corona from near Sun to 1 AU
… CME events as they propagate through the heliosphere and into interplanetary space. By analysing observations from two vantage points of Sun-centred, and coronagraph stereoscopic data, provided by the NASA STEREO spacecraft, a triangulation technique is used to pin-point the location of …
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Supernova shrapnel: nearby supernovae and dust transport in the ISM
… dust carrying ^60Fe from a SN through the Heliosphere, with the aim of estimating the final global distribution on the ocean floor. We study the influences of magnetic fields, angle of arrival, wind and ocean cycling of SN material on the concentrations at different locations. We find that …
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Comparing Different Methods for Estimating Total Open Heliospheric Magnetic Flux
<p>There are extended periods over the solar cycle where significant discrepancies occur between the observed open magnetic flux (i.e., those based on spacecraft observations) and that determined from coronal models. One explanation for the source of these discrepancies is the magnetic fields in …
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Effects of solar particle events on Geospace
… energies are released and accelerated into the heliosphere during (i) sporadic events involving both flares and coronal mass ejections, and (ii) recurrent events driven by co-rotating interaction regions associated with fast solar wind streams from trans-equatorial coronal holes. A small …