Abstract
Beginning in the early 1950s, data from neutron monitors placed the taxonomy of cosmic ray temporal variations on a firm footing, extended the observations of the Sun as a transient source of high energy particles and laid the foundation of our early concepts of a heliosphere. The first major impact of the arrival of the Space Age in 1957 on our understanding of cosmic rays came from spacecraft operating beyond the confines of our magnetosphere. These new observations showed that Forbush decreases were caused by interplanetary disturbances and not by changes in the geomagnetic field; the existence of both the predicted solar wind and interplanetary magnetic field was confirmed; the Sun was revealed as a frequent source of energetic ions and electrons in the 10–100 MeV range; and a number of new, low-energy particle populations was discovered. Neutron monitor data were of great value in interpreting many of these new results.
With the launch of IMP 6 in 1971, followed by a number of other spacecraft, long-term monitoring of low and medium energy galactic and anomalous cosmic rays and solar and interplanetary energetic particles, and the interplanetary medium were available on a continuous basis. Many synoptic studies have been carried out using both neutron monitor and space observations. The data from the Pioneer 10/11 and Voyagers 1/2 deep space missions and the journey of Ulysses over the region of the solar poles have significantly extended our knowledge of the heliosphere and have provided enhanced understanding of many effects that were first identified in the neutron monitor data.
Solar observations are a special area of space studies that has had great impact on interpreting results from neutron monitors, in particular the identification of coronal holes as the source of high-speed solar wind streams and the recognition of the importance of coronal mass ejections in producing interplanetary disturbances and accelerating solar energetic particles.
In the future, with the new emphasis on carefully intercalibrated networks of neutron monitors and the improved instrumentation for space studies, these symbionic relations should prove to be even more productive in extending our understanding of the acceleration and transport of energetic particles in our heliosphere.
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References
Ahluwalia, H. S. and Dessler, A. J.: 1962, 'Diurnal Variation of Cosmic Radiation Intensity Produced by a Solar Wind', Planetary Space Sci. 9, 195.
Anderson, K.A.: 1958, 'Ionizing Radiation Associated with a Solar Radio Noise Storm', Phys. Rev. Lett. 1, 335.
Barnes, C.W. and Simpson J.A.: 1976, 'Evidence for Interplanetary Acceleration of Nucleons in Corotating Interaction Regions', Astrophys. J. 210, L91.
Bartley, W. C., Bukata, R. P., McCracken, K.G., and Rao, U.R.: 1966, 'Anisotropic Cosmic Radiation Fluxes of Solar Origin', J. Geophys. Res. 71, 3297.
Bierman, L.: 1957, 'Solar Corpuscular Radiation and the Interplanetary Gas', Observatory, 109.
Bryant, D. A., Cline, T. L., Desai, U. D., and McDonald, F. B.: 1963, 'New Evidence for Long Lived Solar Streams in Interplanetary Space', Phys. Rev. Lett. 11, 144.
Bryant, D. A., Cline, T. C., Desai, U. D., and McDonald, F. B.: 1965, 'Studies of Solar Protons With Explorer XII and XIV', Astrophys. J. 141, 478.
Carmichael, H: 1964, 'Cosmic Rays', in IQSY Instruction Manual No. 7 (IQSY Secretariat, London) reprinted as Chapt. 13, Ann. IQSY Vol. 1 (MIT Press, Cambridge, MA, 1969) 1, 178.
Carrington, R.C.: 1860, 'Description of a Singular Appearance Seen on the Sun on September 1, 1859', Monthly Notices Roy. Astron. Soc. 20, 13.
Chapman, S.: 1957, Smithsonian Cont. Astrophysics 2, 1.
Coleman, Jr., P. J., Sonett, C. P., Judge, D. L., and Smith, E. J.: 1960, 'Some Preliminary Results of the Pioneer 5 Magnetometer Experiment', J. Geophys. Res. 65, 1856.
Davis, L.: 1955,' Interplanetary Magnetic Fields and Cosmic Rays', Phys. Rev. 100, 1440.
Dorman, L.I.: 1957, 'Var. Kosm Luchei', in: Cosmic Ray Variations, State Publishing House, Moscow.
Fan, C.Y., Meyer, P., and Simpson, J.A.: 1960, 'Rapid Reduction of Cosmic-Radiation Intensity Measured in Interplanetary Space', Phys. Rev. Lett. 5, 269.
Fan, C. Y., Lamport, J. E., Simpson, J. A., and Smith, P. R.: 1966, 'Anisotropy and Fluctuations of Solar Proton Fluxes of Energies 0.6–100 MeV Measured on the Pioneer 6 Space Probe', J. Geophys. Res. 71, 3297.
Fichtel, C. and Guss, D.: 1961, 'Heavy Nuclei in Solar Cosmic Rays', Phys. Rev. Lett. 6, 495.
Firor, J.: 1954, 'Cosmic Radiation Intensity-Time Variations and Their Origin. IV. Increases Associated with Solar Flares', Phys. Rev. 94, 1017.
Fisk, L.A. and Axford, W. I.: 1969, 'Solar Modulation of Galactic Cosmic Rays', 1, J. Geophys. Res. 74, 4973.
Fisk, L. A.: 1971, 'Solar Modulation of Galactic Cosmic Rays', J. Geophys. Res. 76, 221.
Fonger, W. H.: 1953, 'Cosmic Radiation Intensity-Time Variations and Their Origin. II Energy Dependence of 27-Day Variations', Phys. Rev. 91, 351.
Forbush, S. E.: 1937, 'On the Effects in Cosmic-Ray Intensity Observed During the RecentMagnetic Storm', Phys. Rev. 51, 1108.
Forbush, S. E.: 1946, 'Three Unusual Cosmic Ray Increases Possibly Due to Charged Particles From the Sun', Phys. Rev. 70, 771.
Forbush, S.E.: 1954, 'World-Wide Cosmic-Ray Variations 1937-1952', J. Geophys. Res. 59, 525.
Gleeson, L. J. and Axford, W. I.: 1968, 'Solar Modulation of Galactic Cosmic Rays', Astrophys. J. 154, 1011.
Gosling, J. T.: 1993, 'The Solar Flare Myth', J. Geophys. Res. 98, 18937.
Gosling, J. T., Hildner, E., MacQueen, R. M., Munro, R. H., Poland, A. I., and Ross, C. L.: 1974, 'Mass Ejections from the Sun: A View from Skylab', J. Geophys. Res. 79, 4581.
Gringauz, K. I., Bezrukikh, V. D., Ozerov, and Rybchinskii, V.D.: 1960, 'The Study of Interplanetary Ionized Gas, High Energy Electrons and Corpuscular Radiation of the Sun, Employing Three Electrode Charged Particle Traps on the Second Soviet Space Rocket', Dokl. Akad Nauk SSR 131, 1301.
Harrison, R.A.: 1986, 'Solar Coronal Mass Ejections and Flares', Astron. Astrophys. 162, 283.
Hundhausen, A. J.: 1972, Coronal Expansion and Solar Wind, Springer-Verlag, New York.
Hundhausen, A. J.: 1973a, 'Nonlinear Model of High-Speed Solar Wind Streams', J. Geophys. Res. 78, 1528.
Hundhausen, A. J.: 1973b, 'Evolution of Large-Scale Solar Wind Structures Beyond 1AU', J. Geophys. Res. 78, 2035.
Hundhausen, A. J. and Gosling, J. T.: 1976, 'Solar Wind Structure at Large Heliocentric Distances: An Interpretation of Pioneer 10 Observations', J. Geophys. Res. 81, 1436.
Krieger, A. S., Timothy, A. F., and Roelof, E. C.: 1973, 'A Coronal Hole and its Identification as the Source of a High Velocity Solar Wind Stream', Solar Phys. 29, 505.
Krimigis, S. M. and VanAllen, J. A.: 1966, 'Observation of ~500 keV Protons in Space With Mariner IV', Phys. Rev. Lett. 16, 419.
Lockwood, J. A.: 1960, 'On the Long-Term Variation in the Cosmic Radiation', J. Geophys. Res. 65, 19.
Low, B. C.: 1984, 'Self-Similar Magnetohydrodynamics IV, The Physics of Coronal Transients', Astrophys. J. 281, 392.
Low, B. C.: 1996, 'Solar Activity and the Corona', Solar Phys. 167, 217.
McCracken, K. G.: 1962a, 'The Cosmic Ray Flare Effect 1. Some New Methods of Analysis', J. Geophys. Res. 67, 423.
McCracken, K. G.: 1962b, 'The Flare Effects of May 4, November 12, and November 15, 1960', J. Geophys. Res. 67, 435.
McCracken, K. G.: 1962c, 'Deductions Regarding the Interplanetary Magnetic Field', J. Geophys. Res. 67, 447.
McDonald, F. B. and Desai, U. D.: 1971, 'Recurrent Solar Cosmic-Ray Events and SolarMRegions', J. Geophys. Res. 76, 808.
McCracken, K. G. and Palmeira, R. A. R.: 1960, 'Comparison of Solar Cosmic Ray Injection Including July 17, 1959 and May 4, 1960', J. Geophys. Res. 65, 2673.
McDonald, F. B., Teegarden, B. J., Trainor, J. H., vonRosenvinge, T. T., and Webber, W. R.: 1975, 'The Interplanetary Acceleration of Energetic Nucleons', Astrophys. J. 203, L149.
Meyer, P. and Simpson, J. A.: 1955,' Changes in the Low-Energy Particle Cutoff and Primary Spectrum of Cosmic Radiation', Phys. Rev. 99, 1517.
Meyer, P., Parker, E. N., and Simpson, J. A.: 1956, 'Solar Cosmic Rays of February, 1956 and Their Propagation Through Interplanetary Space', Phys. Rev. 104, 768.
Morrison, P.: 1956, 'Solar Origin of Cosmic Ray Time Variation', Phys. Rev. 101, 1397.
Neher, H. V. and Stern, E. A.: 1955, '“Knee” of the Cosmic-Ray Latitude Curve', Phys. Rev. 98, 845.
Ness, N. F.: 1966, 'Observed Properties of the Interplanetary Plasma', Ann. Rev. Astron. Astrophys. (Annual Reviews, Palo Alto, CA) 6, 79.
Ness, N. F., Scearce, C. S., and Seek, J. B.: 1964, 'Initial Results of the IMP 1 Magnetic Field Experiment', J. Geophys. Res. 69, 3571.
Neugebauer, M. and Snyder, C. W.: 1962, 'The Mariner II Preliminary Observations, Solar Plasma Experiment', Science 138, 1095.
O'Gallagher, J. J. and Simpson, J. A.: 1966, 'Anisotropic Propagation of Solar Protons Deduced From Simultaneous Observations by Earth Satellites and the Mariner IV Space Probe', Phys. Rev. Lett. 16, 1212.
Parker, E. N.: 1958, 'Dynamics of the Interplanetary Gas and Magnetic Fields', Astrophys. J. 128, 664.
Parker, E. N.: 1961, 'Sudden Expansion of the Corona Following a Large Solar Flare and the Attendant Magnetic Field and Cosmic Ray Effects', Astrophys. J. 133, 1014.
Parker, E. N.: 1965, 'The Passage of Energetic Charged Particles Through Interplanetary Space', Planetary Space Sci. 13, 9.
Phillips, J. L., Bame, S. J., Barnes, A., Barraclough, B. L., Feldman, W. C., Goldstein, B. E., Gosling, J. T., Hoogeveen, G. W., McComas, D. J., Neugebauer, M., and Suess, S. T.: 1995, 'ULYSSES Solar Wind Plasma Observations From Pole to Pole', Geophys. Res. Lett. 22, 3,301–3,304.
Quenby, J. J. and Webber, W. R.: 1959, 'Cosmic Ray Cut-Off Rigidities and the Earth's Magnetic Field', Phil. Mag. 4, 90.
Rao, U. R., McCracken, K. G., and Venkatesan, D. J.: 1963, 'Asymptotic Cones of Acceptance and Their Use in the Study of the Daily Variation of Cosmic Rays', J. Geophys. Res. 68, 345.
Reames, D. V.: 1995, 'Coronal Abundances Determined from Energetic Particles', Adv. Space Res. 15, (7) 41.
Rothwell, P. and McIlwain, C. E.: 1959, Nature 184, 138.
Shea, M. A. and Smart, D. F.: 1993, in C. E. Swenberg et al. (eds.), 'History of Energetic Solar Protons for the Past Three Solar Cycles Including Cycle 22 Update', Biological Effects and Physics of Solar and Galactic Cosmic Radiation, Part B, Plenum Press, New York, p. 37.
Shklovskii, I. S., Moroz, V. I., and Kurst, V. G.: 1960, Astron. Zh 37, 931.
Simpson, J. A.: 1954, 'Cosmic-Radiation Intensity-Time Variations and Their Origin. III. The Origin of 27-Day Variations', Phys. Rev. 94, 426.
Simpson, J. A.: 2000, 'The Cosmic Ray Nucleonic Component: The Invention and Scientific Uses of the Neutron Monitor', Space Sci. Rev., this volume.
Simpson, J. A., Gonger, W., and Treiman, S. B.: 1953, 'Cosmic Radiation Intensity-Time Variations and Their Origin I. Neutron Intensity Variation Method and Meteorological Factors', Phys. Rev. 90, 934.
Smith, E. J. and Wolfe, J. H.: 1976, 'Observations of Interaction Regions and Co-Rotating Shocks between One and Five AU: Pioneer 10 and 11', Geophys. Res. Lett. 3, 137.
Snyder, C. W., Neugebauer, M., and Rao, V. R.: 1963, 'The Solar Wind Velocity and It's Correlation With Cosmic Ray Variations and With Solar Wind and Geomagnetic Activity', J. Geophys. Res. 68, 6361.
Steljes, J. F., Carmichael, H., and McCracken, K. G.: 1961, 'Characteristics and Find Structure of the Large Cosmic Ray Fluctuations in November 1960', J. Geophys. Res. 66, 1363.
Tousey, R.: 1973,' The Solar Corona', Adv. Space Res. 13, 713.
Van Hollebeke, M.A.I., McDonald, F. B., Trainor, J. H., and von Rosenvinge, T. T.: 1978, 'The Radial Variation of Corotating Energetic Particle Streams in the Inner and Outer Solar System', J. Geophys. Res. 83, 723–4731.
Webber, W.R. and Quenby, J. J.: 1959, 'On the Derivation of Cosmic Ray Specific Yield Functions', Phil. Mag. 4, 654.
Zirker, J. B. (ed.): 1977, Coronal Holes and High Speed Wind Streams, Skylab Solar Workshop, Colorado University Press, Boulder, CO, 1977.
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Mcdonald, F.B. Integration of Neutron Monitor Data with Spacecraft Observations: a Historical Perspective. Space Science Reviews 93, 263–284 (2000). https://doi.org/10.1023/A:1026552730290
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DOI: https://doi.org/10.1023/A:1026552730290