Origin of C+ ions in the heliosphere

Geiss, J.; Gloeckler, G.; Steiger, R. von

doi:10.1007/bf00170791

Cited by 42 publications

(50 citation statements)

References 26 publications

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“…Given the large size of these corrections, a factor of 2 difference from SIS is probably not unreasonable, but the question of just how much ACR C is present at 1 AU under strict quiet time conditions appears to be unresolved. Data from SAMPEX [20,21] indicate that some of this C is not highly ionized and may be ACRs, though sources other than interstellar neutrals are possible [13].…”

Section: Elemental Spectramentioning

confidence: 99%

“…Although other elements have been found with small enhancements at lower energies [10,11], which may originate as adsorbed, neutralized, and desorbed solar wind on dust grains [12] or grain destruction products [13], the bulk of the ACRs provide a direct sample of the neutral interstellar medium. As such, studies of the isotopic composition of this material can shed light on the overall nucleosynthetic history of this part of the Galaxy since the formation of the solar system some 4.5 billion years ago and on the nature of galactic cosmic rays (GCRs), which may also be an accelerated sample of the present day interstellar medium [14].…”

Section: Introductionmentioning

confidence: 99%

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Anomalous cosmic ray composition from ACE

Leske¹

2000

AIP Conference Proceedings

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Abstract. During solar quiet periods, the Solar Isotope Spectrometer (SIS) on the Advanced Composition Explorer (ACE) measures the composition and energy spectra of anomalous cosmic rays (ACRs) with energies > 8 MeV/nucleon in interplanetary space at 1 AU. In particular, the spectra of individual isotopes for the ACR elements N, 0, and Ne are studied with SIS. Intensity enhancements are found in low energy 18 O and 22 Ne, with relative abundances of 18 O/ 16 O ~ 0.002 and 22 Ne/ 20 Ne ~ 0.1. The neon abundance ratio appears more similar to that found in the solar wind than in meteorites and is far below that determined for the galactic cosmic ray (GCR) source, indicating that GCRs contain material from sources other than just the local interstellar medium.

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Section: Elemental Spectramentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Anomalous cosmic ray composition from ACE

Leske¹

2000

AIP Conference Proceedings

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“…The released gas and the ions should contribute to the heavy component of the inner-source pickup ions (Geiss et al 1996). Pickup ions differ from the bulk solar wind by their charge state and velocity distribution.…”

Section: Introductionmentioning

confidence: 99%

Dust Destruction and Ion Formation in the Inner Solar System

Mann

Czechowski

2005

ApJ

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We suggest that dust-dust collisions feed ions into the interplanetary medium and produce a significant amount of the heavy inner-source pickup ions detected by the Solar Wind Ion Composition Spectrometer aboard the Ulysses spacecraft. Organic refractory material contained in the cometary dust could explain the existence of carbon among the measured pickup ions. Impact-produced ions may locally influence the plasma parameters of the solar wind. It will be possible to study in situ these dust-plasma interactions and the central region of meteoroid activity through measurements in the inner solar system proposed for the currently discussed Solar Probe and Solar Orbiter missions.

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“…Inner Source pickup ions are thought to originate from the interaction of solar wind ions with dust in the inner solar system (Geiss et al 1996). An unsolved puzzle is the overabundance of neon in inner-source pickup ions reported by Gloeckler et al (2000) and by Allegrini et al (2005).…”

Section: The "Inner Source"mentioning

confidence: 99%

Composition of matter in the heliosphere

Bochsler

2008

Proc. IAU

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Abstract. The Sun is by far the largest reservoir of matter in the solar system and contains more than 99% of the mass of the solar system. Theories on the formation of the solar system maintain that the gravitational collapse is very efficient and that typically not more than one tenth from the solar nebula is lost during the formation process. Consequently, the Sun can be considered as a representative sample of interstellar matter taken from a well mixed reservoir 4.6 Gy ago, at about 8 kpc from the galactic center. At the same time, the Sun is also a faithful witness of the composition of matter at the beginning of the evolution of the solar system and the formation of planets, asteroids, and comets. Knowledge on the solar composition and a fair account of the related uncertainties is relevant for many fields in astrophysics, planetary sciences, cosmo-and geochemistry. Apart from the basic interest in the chemical evolution of the galaxy and the solar system, compositional studies have also led to many applications in space research, i.e., it has helped to distinguish between different components of diffuse heliospheric matter. The elemental, isotopic, and charge state composition of heliospheric particles (solar wind, interstellar neutrals, pickup ions) has been used for a multitude of applications, such as tracing the source material, constraining parameters for models of the acceleration processes, and of the transport through the interplanetary medium. It is important to realize, that the two mainstream applications, as outlined above -geochemistry and cosmochemistry on one side, and tracing of heliospheric processes on the other side -are not independent of each other. Understanding the physical processes, e.g., of the fractionation of the solar wind, is crucial for the interpretation of compositional data; on the other hand, reliable information on the source composition is the basis for putting constraints on models of the solar wind fractionation.

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Origin of C+ ions in the heliosphere

Cited by 42 publications

References 26 publications

Anomalous cosmic ray composition from ACE

Anomalous cosmic ray composition from ACE

Dust Destruction and Ion Formation in the Inner Solar System

Composition of matter in the heliosphere

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