The tilt effect on cutoff
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En este trabajo se analiza el efecto que tiene sobre la rigidez umbral de los protones de rayos cósmicos la inclinación del dipolo magnético respecto al flujo del viento solar. El análisis se hace para diferentes horas locales de arribo vertical a College Station, que tiene una latitud invariante de ͌ 64°. Se encuentra que la energía umbral calculada para diferentes ángulos de inclinación a la misma hora de llegada difiere en más de 20 MeV, correspondiendo las mayores diferencias a la llegada a 18 horas locales y las menores a las 6 horas. También se calcula la variación diurna del umbral tomando en cuenta la variación diurna del ángulo de inclinación, durante los solsticios de verano e invierno para una estación con λinv=64° y una ϕ mag=Oº. Se compara con la variación diurna que se obtiene sin tomar en cuenta las variaciones de este ángulo y se encuentra que existen diferencias mayores de 10 Me V en las energías umbral esperadas.
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BAILEY, D. K., 1964. Polar-cap absorption, Planet. Space Sci. 12, 495. DOI: https://doi.org/10.1016/0032-0633(64)90040-6
BURCH, J. L., 1971. Tilt angle dependence of 10-MeV proton cutoff latitudes, Rep. X-646-71-344, Goddard Space Flight Center, Greenbelt, Maryland.
CAIN, J. C., S. J. HENDRICKS, R. A. LANGEL, and W. A. HUDSON, 1967. A proposed model for the international geomagnetic reference field-1965, O. J. Geomagn. Geoelec., 19, 335. DOI: https://doi.org/10.5636/jgg.19.335
FANSELOW, J. L., and E. C. STONE, 1972. Geomagnetic cutoffs for cosmic-ray protons for seven energy intervals between 1.2 and 39 MeV, J. Geophys. Res. 77, 3999. DOI: https://doi.org/10.1029/JA077i022p03999
FLINDT, H. R., 1970. Local time dependence of geomagnetic cutoffs for solar protons, 0.52 ≤ Ep ≤4 MeV, J. Geophys. Res. 75, 39. DOI: https://doi.org/10.1029/JA075i001p00039
FREIER, P. S., E. P. NEY, and J. R. WINCKLER, 1959. Balloon observations of solar cosmic rays on March 26, 1958, J. Geophys. Res. 64, 685. DOI: https://doi.org/10.1029/JZ064i006p00685
GALL, R., J. JIMENEZ, and L. CAMACHO, 1968. Arrival of low-energy cosmic rays via the magnetospheric tail, J. Geophys. Res. 73, 1593. DOI: https://doi.org/10.1029/JA073i005p01593
HEDGECOCK, P. C., 1977, private communication.
HOFFMAN, D. J., and H. H. SAUER, 1968. Magnetospheric cosmic-ray cutoffs and their variations, Space Sci Rev., 8, 750. DOI: https://doi.org/10.1007/BF00175117
IMHOF, W. L., J. B. REAGAN, and E. E. GAINES, 1971. Solar particle cutoffs as observed at low latitudes, J. Geophys. Res., 76, 4276. DOI: https://doi.org/10.1029/JA076i019p04276
MASLEY, A. J., W. P. OLSON, and K. A. PFITZER, 1971. Calculations of charged particles entry into polar region, paper presented at the Twelfth International Conference on Cosmic Rays, Hobart, Tasmania, Australia.
Mc. DIARMID, I. B., J. R. BURROWS, and M. D. WILSON, 1971. Structure observed in solar particle latitude profiles and its dependence on rigidity, J. Geophys. Res. 76, 227. DOI: https://doi.org/10.1029/JA076i001p00227
MEAD, G.D., and D. H. FAIRFIELD, 1975. A quantitative magnetospheric model derived from spacecraft magnetometer data, J. Geophys. Res., 80, 523. DOI: https://doi.org/10.1029/JA080i004p00523
NEY, E. P., J. R. WINCKLER, and P. S. FREIER, 1959. Protons from the Sun on May 12, 1959, Phys. Rev. Letters, 3, 183. DOI: https://doi.org/10.1103/PhysRevLett.3.183
OLSON, W. P., and K. A. PFITZER, 1974. A quantitative model of the magnetospheric magnetic field, J. Geophys. Res., 79, 3739. DOI: https://doi.org/10.1029/JA079i025p03739
PFITZER, K. A., 1979. The effect of magnetic field models on cosmic ray cutoff calculations, in "Quantitative Modeling of Magnetospheric Processes", ed. by W. P. Olson, p. 242, Am. Geophys. U. Washington, D. C. DOI: https://doi.org/10.1029/GM021p0242
PAULIKAS, G. A., J. B. BLAKE, and A. L. VAMPOLA, 1970. Solar particle observations over the polar caps, in "Particles and Fields in the Magnetosphere", edited by B. M. Mc Cormac, p. 141, D. Reidel, Dordrecht, Netherlands. DOI: https://doi.org/10.1007/978-94-010-3284-1_15
QUENBY, J. J., 1969. The entry of solar protons into the geomagnetic field during the event of June 9, 1968, Acta Phys. Sippl, 2, 475.
REID, G. C., and H. LEINBACK, 1959. Low energy cosmic-ray events associated with solar flares, J. Geophys. Res. 64, 1801. DOI: https://doi.org/10.1029/JZ064i011p01801
SMART, D. F., M.A. SHEA, and R. GALL, 1969. The daily variation of trajectory-derived high latitude cutoff rigidities in a model magnetosphere, J. Geophys. Res., 74, 4731. DOI: https://doi.org/10.1029/JA074i019p04731
STONE, E. C., 1964. Local time dependence of non-Stormer cutoff for 1.5 MeV protons in quiet geomagnetic field, J. Geophys. Res., 69, 3577. DOI: https://doi.org/10.1029/JZ069i017p03577
TAYLOR, H. E., 1967. Latitudinal local-time dependence of low energy cosmic-ray cutoffs in a realistic geomagnetic field, J. Geophys. Res. 72, 4467. DOI: https://doi.org/10.1029/JZ072i017p04467
THOMAS, B., 1968. Private communication.