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  • GEOPHYSICS  (653)
  • SPACE RADIATION  (244)
  • 1985-1989  (897)
  • 1
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    Stratospheric ozone measurements from the 1985 MAP/GLOBUS NO(x) campaign (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Nine experiments obtained stratospheric ozone measurements during the fall 1985 Middle Atmosphere Program (MAP) Global Budget of Stratospheric Trace Constituents (GLOBUS) NO(x) campaign. Measurements are grouped into four sets from four air masses and compared. Agreement between individual experiments and weighted mean profiles is generally within 10 percent and within absolute accuracies. Dobson Umkehr values in layer 5 differ by more than absolute accuracies from weighted mean profiles. Brewer sonde values for one data set are outside absolute accuracies near the ozone peak. Solar UV occultation measurements are 30-35 percent less than the weighted mean profile and outside absolute accuracies. Measurements from the Exospheric Satellite backscattered ultraviolet experiment, not previously compared with other techniques, agree within 10-15 percent of weighted mean profiles. Results of the campaign are generally consistent with those of four previous intercomparison campaigns.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 94; 11074-11
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  • 2
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    Role of solar flare index in long term modulation of cosmic ray intensity (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Recently, the importance of the occurrence of solar flares in the long-term modulation of cosmic ray intensity has been re-emphasized. For this purpose, the data of solar flares have been used from various publications, such as Solar Geophysical Data books, U.A.G. reports and Quarterly Bulletin Of Solar Activity. Research very clearly reveals that even the periodic changes in the solar flare observations, obtained from the four different data sources, for the same interval, differ significantly from one another; this is evidenced even on an average basis. Hence, in any study using solar flares, the importance of selecting a single compilation of the solar-flare data for the entire period of investigation is stressed.
    Keywords: SPACE RADIATION
    Type: SH-4.4-12 , 19th Intern. Cosmic Ray Conf - Vol. 5; p 63-66; NASA-CP-2376-VOL-5
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  • 3
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    General comparison of ozone vertical profiles obtained by various techniques during the 1983 MAP/GLOBUS campaign (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: As part of the 1983 MAP/GLOBUS campaign, atmospheric ozone profile measurements were made using a large variety of different techniques both from balloon platforms and the ground. It is shown that, for most techniques, the measured height distributions agree to within + or - 5 percent with the exception of the remote visible absorption method. This + or - 5 percent uncertainty is of the order of the individual intersystem accuracy. It is suggested that since the differences with the visible absorption method are in magnitude rather than in form, the absorption cross-section data could be the possible cause for the discrepancy.
    Keywords: GEOPHYSICS
    Type: Planetary and Space Science (ISSN 0032-0633); 35; 603-607
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  • 4
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    SAGE II inversion algorithm (1989)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The operational Stratospheric Aerosol and Gas Experiment II multichannel data inversion algorithm is described. Aerosol and ozone retrievals obtained with the algorithm are discussed. The algorithm is compared to an independently developed algorithm (Lenoble, 1989), showing that the inverted aerosol and ozone profiles from the two algorithms are similar within their respective uncertainties.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 94; 8339-835
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  • 5
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    Magnetic configuration of the distant plasma sheet - ISEE 3 observations (1987)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The influence of the IMF orientation and magnitude and substorm activity on the magnetic configuration of the central plasma sheet at 20-240 earth radii down the geomagnetic tail is investigated on the basis of ISEE-3 data. The results are presented graphically, and high-speed antisolar bulk flows threaded by southward magnetic fields are shown to be present in the distant plasma sheet after periods of substorm activity and southward IMF Bz. The effective dayside reconnection efficiency is estimated as 25 + or - 4 percent, in good agreement with theoretical models.
    Keywords: GEOPHYSICS
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  • 6
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    Pulsed emission of TeV gamma rays from Vela pulsar (1985)
    In:  CASI
    Details
    Publication Date: 2016-06-11
    Description: The Ooty atmospheric Cerenkov array, consisting of 10 parabolic mirrors of 0.9 m diameter and 8 of 1.5 m diameter, was used for observations on the Vela pulsar to see if it emits gamma rays in the TeV energy range. During the winter of 1984-85, the array was split into two parts: (1) consisting wholly of the smaller mirrors, and (2) wholly of the bigger mirrors. The two arrays were operated at two different sites to distinguish a marginally significant genuine pulsar signal from spurious signals produced trivially by chance fluctuations in the background rates. All the mirrors were pointed at the celestial object to track it for durations of the order of 1 to 6 hours during clear moonless nights. The event time data is analyzed to detect a possible pulsed emission of TeV gamma rays using the contemporaneous pulsar elements on the basis of their radio observations on the Vela pulsar. Results from the analyses of observations made during the winters of 1982-83 and 1984-85 on steady pulsed emission and on possible transient emission is presented.
    Keywords: SPACE RADIATION
    Type: 19th Intern. Cosmic Ray Conf - Vol. 1; p 159-160; NASA-CP-2376-VOL-1
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  • 7
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    Search for gamma rays of energy 10(15) eV from Cygnus X-3 (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Finite flux of excess radiation of energy 10 to the 15th power has been reported by two groups from the direction of Cygnus X-3, with the characteristic periodicity of 4.8 hrs. Samorski and Stamm find that the muon content of the showers generated by this excess radiation is about 77% of that in normal cosmic ray showers, whereas the expectation for gamma ray showers is less than 10%. It is thus difficult to understand the nature of the radiation arriving from the direction of Cygnus X-3. Samorski and Stamm measured the muon densities close to the core (approx. 10 m), where contamination due to other components is severe. Even though this does not explain the high ratio of muon densities, measurements should be carried out away from the core to establish the nature of the radiation. In order to establish the signal from Cygnus X-3 and its muon content with better statistical significance, an extensive air shower array, specifically designed for this purpose was operated at Kolar Gold Fields (longitude: 78 deg .3 E; latitude: + 12 deg .95; atmospheric depth: 920 q/square centimeters) since September, 1984. The details of the array and the accuracy of arrival direction measurements are discussed.
    Keywords: SPACE RADIATION
    Type: OG-2.1-1 , 19th Intern. Cosmic Ray Conf - Vol. 1; p 59-61; NASA-CP-2376-VOL-1
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  • 8
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    Cosmic ray intensity distribution perpendicular to solar equatorial plane at 1 A.U. during 1978-83 (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The distribution of cosmic ray intensity perpendicular to solar equatorial plane, was investigated by using its yearly variation with respect to the heliolatitudinal position of the Earth, for the two intervals 1978 to 1980 and 1981 to 1983. The monthly mean values of two high latitude stations along with the solar and geomagnetic indices are used to derive the cosmic ray intensity distribution free from the changes due to variation in solar activity. The correction is found to be significant only during the interval 1976 to 1980. The results indicate a significant linear increase in cosmic ray intensity from north to south of solar equator, contrary to that observed during 1973 to 1975. No symmetrical gradients are found during the period of study, in agreement with earlier results.
    Keywords: SPACE RADIATION
    Type: SH-4.3-14 , 19th Intern. Cosmic Ray Conf - Vol. 5; p 23-26; NASA-CP-2376-VOL-5
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  • 9
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    The Figaro experiment for the observation of time marked sources in the low energy gamma-ray range (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The only two firmly identified galactic gamma-ray sources in the second COS B catalogue are the pulsars PSR 0531+21 (Crab) and PSR 0833-45 (Vela). In the region between 100 keV and 10 MeV the detailed shape of the emission is particularly important, since one expects a turn-off which is related to geometry of the source. A marginal evidence of such a turn-off just below 1 MeV has been reported for the Vela pulsar. In order to study sources with a well marked time signature in this energy band, the FIGARO - French Italian Gamma Ray Observatory was designed. The first version was launched in November 1983 from the Sao Manuel base (Brazil), and was destroyed in a free fall following a balloon burst at an altitude of 50 mbar. A brief description is given of the new improved version of the experiment, FIGARO 2, which is nearly completed and whose launch is scheduled before summer 1986.
    Keywords: SPACE RADIATION
    Type: OG-9.2-11 , 19th Intern. Cosmic Ray Conf - Vol. 3; p 334-337; NASA-CP-2376-VOL-3
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  • 10
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    Search for TeV gamma rays from extragalactic sources and the Galactic Center (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Ooty atmospheric Cerenkov array was used in 1982-83 to see if the galactic center and the extra-galactic sources 3C 273, Centaurus A emit gamma rays at TeV energies. The ON/OFF method was used wherein the source was tracked for 16 minutes and immediately afterwards, a background region in the same zenith angle range was tracked for the next 16 minutes. Data were taken for approx 15 hours (55 scans) on 3C273, approx 7 hours (26 scans) on Cen A and 5 hours (19 scans) on galactic center. A preliminary analysis involving direct comparison of total rates on and off the source shows no significant excess from any of these orbits. Results of detailed analysis using different energy thresholds are presented.
    Keywords: SPACE RADIATION
    Type: OG-2.7-1 , NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 1; p 263
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