Evolutionary and Physical Properties of Meteoroids: The Proceedings of the International Astronomical Union's Colloquium # 13, Held at the State University of New York, Albany, N.Y., on June 14-17, 1971Curtis L. Hemenway, Peter MacKenzie Millman, Allan F. Cook Scientific and Technical Information Office, National Aeronautics and Space Administration, 1973 - 378 من الصفحات "The Fourteenth General Assembly of the International Astronomical Union was held in Brighton, England, in 1970. During the conference, arrangements were made to hold a colloquium on "The Evolutionary and Physical Problems of Meteoroids." An invitation was issued by the State University of New York at Albany (SUNYA) and the Dudley Observatory to host the meeting. C.L. Hemenway, P.M. Millman, and A.F. Cook were selected to organize the program. IAU Colloquium No. 13 was held June 14-17, 1971, at the State University of New York at Albany. Forty papers were presented and are included in this volume."--Preface. |
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طبعات أخرى - عرض جميع المقتطفات
عبارات ومصطلحات مألوفة
ablation acceleration Apollo 11 Aquarids Arietids asteroid belt asteroids Astron Astrophys atmosphere atoms axis brightness Ceplecha chondrites coefficient collisions cometary comets computed Contrib cosmic dust craters curve deceleration density detector diameter distribution Earth effect electron elements energy equation experiments fireballs flux fragment Friichtenicht function Geminid Geophys grains Hawkins height hematite impact initial interplanetary ionization ions iron km/s Kresák Lebedinets light curve luminosity luminous efficiency lunar rock magnetic magnetite magnitude mass McCrosky measured meteor spectra meteorites meteoroid micrometeoroids molecules multiplets NASA nebula Network observed obtained Orionids parameters particles percent Perseid phase photographic meteors planet planetesimals plasma pulse radar radar meteors radiating volume radius range ratio recombination relative remanence shower simulated meteor Smithson solar nebula solar system spectrum stream surface target Taurid temperature tion trail values Van de Graaff velocity Verniani wavelength Whipple zodiacal light
مقاطع مشهورة
الصفحة 339 - This work has been supported in part by grants from the National Science Foundation and the National Aeronautics and Space Administration. REFERENCES CAMERON, AGW, 1970.
الصفحة 345 - R,= 10-3 6 s (cm), so that we are in the realm of Epstein's and Stokes' laws of drag up to "cometesimals" of radius 100 m or larger at great solar distances. Correspondingly, the mean free path of the gas molecules is of the order of 1 m or more so that little error is made in applying Epstein's law up to perhaps s=10 m, while to about the same limit the diffusion slowing of the accretion rate by the second term of equation (13) can be neglected. Hence, by equation (15), the time <i for a tiny grain...
الصفحة 225 - SHOEMAKER, EM, HAIT, MH, SWANN, GA, SCHLEICHER, DL, SCHABER, GG, SUTTON, RL, DAHLEM, DH, GODDARD, EN, AND WATERS, AC, 1970. Origin of the lunar regolith at Tranquility Base, Proc.
الصفحة 360 - WETHERILL, GW and WILLIAMS, JG (1968) Evaluation of the Apollo asteroids as sources of stone meteorites. J. Geophys. Res. 73, 635-648. WHIPPLE, FL (1950) A comet model. I. The acceleration of comet Encke. Astrophys. J. Ill, 375-394. WHIPPLE, FL (1951) A comet model. II. Physical relations for comets and meteors.
الصفحة 212 - PORTER, JG, 1952. Comets and meteor streams, J. Wiley and Sons, New York, 123 pp. POULTNEY, SK, 1970. Circular letter to observers. , 1972. Laser radar studies of upper atmosphere dust layers and the relation of temporary increases in dust to cometary micrometeoroid streams, Space Research XII, 403—421. ROOSEN, RG, 1969. The Gegenschein, Ph.D. dissertation, Univ. of Texas. , 1970. The Gegenschein and interplanetary dust outside the Earth's orbit, Icarus, 13, 184201. SILVERBERG, EC, 1970. Interplanetary...
الصفحة 206 - BLOCH, MR, FECHTIG, H., GENTNER, W., NEUKUM, G., AND SCHNEIDER, E., 1971. Meteorite impact craters, crater simulations and the meteoroid flux in the early solar system, Proc. Second Lunar Sci.
الصفحة 127 - Perseid showers indicate a relationship between the frequency of occurrence of the oxygen line and solar activity. In 1969-70, near sunspot maximum, the strength of this so-called auroral green line is greatest near shower maximum, as though the nature of the meteoroids were a function of their distance from the core of the stream, or, alternatively, the strength of the green line were a function of the altitude of the radiant. SINCE 1948, A...
الصفحة 43 - GREENHOW, JS, AND NEUFELD, EL, 1955. The diffusion of ionized meteor trails in the upper atmosphere, J. Atmos. Terr. Phys., 6, 133-140. KAISER, TR, 1955. The interpretation of radio echoes from meteor trails, in Meteors, edited by TR Kaiser, Pergamon Press, New York, 55-64.
الصفحة 114 - ELTERMAN, L., 1964. Atmospheric attenuation model, 1964, in the ultraviolet, visible, and infrared regions for altitudes to 50 km, US Air Force Environ.
الصفحة 133 - Smithsonian Astrophysical Observatory Cambridge, Massachusetts AND CL HEMENWAY State University of New York at Albany and Dudley Observatory Albany, New York The spectra of 25 meteors, recorded with an image-orthicon technique in December 1969, are studied in relation to similar records made in August of the same year. Of 19 Geminid meteors in the absolute visual magnitude range 0 to +2, only one showed any evidence of the forbidden line of oxygen at 5577 A, while all Perseid meteors recorded in...