Abstract
Solar particle fluxes were measured with balloon-borne instrumentation at Kiruna (Sweden) during the solar particle events of August 1972. Data from these balloon flights and from the satellite Explorer 41 were used to investigate the temporal variations of the energy spectrum during the event following the flare at 0620 UT on August 4, 1972. It was found that the slope of the energy spectrum increased linearly in the latter part of the event. Extrapolation of these linear variations to the time of the flare yielded power-law differential energy spectra with an exponent 1.8 ≤ γ ≤ 2.3 or exponential rigidity spectra with a characteristic rigidity 85 MV ≤ P 0 ≤ 110 MV. These values are in agreement with the corresponding parameters of time-integrated fluxes from Explorer 41. Implications of these results on the source energy spectrum of the solar particles and their propagation in interplanetary space are discussed.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Boström, C. O., Kohl, J. W., McEntire, R. W., and Williams, D. J.: 1972, ‘The Solar Proton Flux — August 2–12, 1972’, Preprint, The Johns Hopkins University, Applied Physics Laboratory.
ESSA Solar Geophysical Data, 1973, No. 342, Part 2.
Heristchi, Dj., Kangas, J., Kremser, G., Legrand, J. P., Masse, P., Palous, M., Pfotzer, G., Riedler, W., and Wilhelm, K.: 1969, Ann. IQSY 3, 267, MIT Press.
Kremser, G., Pfotzer, G., Kirsch, E., Riedler, W., Specht, H., and Zirm, K.: 1973, Kleinheubacher Ber. 15, 405.
Pfotzer, G.: 1965, in B. Maehlum (ed.), High Latitude Particles and the Ionosphere, Logos Press, London, p. 167.
Pomerantz, M. A. and Duggal, S. P.: 1973, Nature 241, 331.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1974 D. Reidel Publishing Company, Dordrecht-Holland
About this paper
Cite this paper
Kremser, G., Pfotzer, G., Kirsch, E., Specht, H., Riedler, W., Zirm, K. (1974). Temporal Variations of Solar Particle Spectra (August 4–7, 1972). In: Page, D.E. (eds) Correlated Interplanetary and Magnetospheric Observations. Astrophysics and Space Science Library, vol 42. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-2172-2_41
Download citation
DOI: https://doi.org/10.1007/978-94-010-2172-2_41
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-2174-6
Online ISBN: 978-94-010-2172-2
eBook Packages: Springer Book Archive