Anomalous composition and energy spectra of cosmic rays below 20 MeV/nucleon
Creators
- 1. Maryland Univ., College Park (USA). Dept. of Physics and Astronomy
- 2. Arizona Univ., Tucson (USA). Dept. of Physics
Description
For the recently discovered anomalous spectral shapes and abundances of quiet time oxygen and carbon, we examined in detail for a 17 month period (Nov. 1973 to March 1975) the relative abundances and energy spectra of C, N, O and Fe as a function of the interplanetary low energy proton (> 430 keV) intensity. When the proton activity was at its lowest level the oxygen intensity was enhanced, while all other heavy elements almost disappeared. From the fact that the nuclei of E < 3 MeV/nucleon showed a strong intensity fluctuation with interplanetary disturbance condition and a velocity anisotropy along the garden-hose angle whereas that in the energy range 3.0-24 MeV/nucleon did not, we conclude that the former component is of solar and the latter is of non-solar origin. (orig.)
Abstract (German)
Wegen der kuerzlich entdeckten Anomalien bei Spektrumsformen und Haeufigkeiten von Sauerstoff und Kohlenstoff waehrend der stillen Phasen, werden relative Haeufigkeiten und Energiespektren von C, N, O und Fe 13 Monate lang (von Nov. 1973 bis Maerz 1975) als Funktion der Intensitaet der interplanetaren niederenergetischen Protonen (> 430 MeV) untersucht. Immer wenn die Protonenaktivitaet ihren niedrigsten Stand erreicht hatte, war die Sauerstoffintensitaet erhoeht, waehrend alle anderen schweren Elemente fast verschwanden. Aus der Tatsache, dass die Kerne mit E < 3 MeV/Nukleonen stark mit dem interplanetaren Stoerzustand schwankten und eine Geschwindigkeitsanomalie laengs des Gartenschlauch-Winkels aufwiesen, waehrend das bei denen im Energiebereich 3,0-24 MeV/Nukleon der Fall war, wird geschlossen, dass erstere Komponente solaren und letztere nicht solaren Ursprungs ist. (orig.)Additional details
Publishing Information
- Imprint Title
- 14th international cosmic ray conference. Conference papers. Vol. 2
- Imprint Pagination
- p. 786-791.
- Report number
- AED-Conf--75-696-000
Conference
- Title
- 14. international cosmic ray conference.
- Dates
- 15 Aug 1975.
- Place
- Garching/Muenchen, Germany, F.R.
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 8302416
- Subject category
- S79: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;
- Resource subtype / Literary indicator
- Conference, Non-conventional Literature
- Descriptors DEI
- ANISOTROPY; CARBON; COSMIC RAY FLUX; ELEMENT ABUNDANCE; ENERGY SPECTRA; HYDROGEN; IRON; MAGNESIUM; MEV RANGE; NEON; NITROGEN; OXYGEN; PRIMARY COSMIC RADIATION; PROTONS; SILICON; SOLAR RADIATION; VARIATIONS
- Descriptors DEC
- ALKALINE EARTH METALS; BARYONS; CATIONS; CHARGED PARTICLES; COSMIC RADIATION; ELEMENTARY PARTICLES; ELEMENTS; ENERGY RANGE; FERMIONS; HADRONS; HYDROGEN IONS; HYDROGEN IONS 1 PLUS; IONIZING RADIATIONS; IONS; METALS; NONMETALS; NUCLEONS; QUANTITY RATIO; RADIATION FLUX; RADIATIONS; RARE GASES; SEMIMETALS; SPECTRA; STELLAR RADIATION; TRANSITION ELEMENTS
Optional Information
- Notes
- 5 figs.; 1 tab.; with refs. Available from ZAED.