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  • GEOPHYSICS  (22)
  • 2015-2019
  • 1990-1994  (1)
  • 1985-1989  (5)
  • 1965-1969  (16)
  • 1935-1939
  • 1
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    Sunspot cycle and seasonal variations in the position and intensity of the equatorial electrojet in the Indian region. (1967)
    In:  Other Sources
    Details
    Publication Date: 2011-08-11
    Description: Seasonal variations in position and intensity of equatorial electrojet and correlation of latter with sunspot number
    Keywords: GEOPHYSICS
    Type: TELLUS
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Observations of Pc5 micropulsation-related electric field oscillations in equatorial ionosphere (1994)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A 54.95-MHz coherent backscatter radar, an ionosonde and the magnetometer located at Trivandrum in India (8.5 deg N, 77 deg E, 0.5 deg N dip angle) recorded large-amplitude ionospheric fluctuations and magnetic field fluctuations associated with a Pc5 micropulsation event, which occurred during an intense magnetic storm on 24 March 1991 (A(sub p) = 161). Simultaneous 100-n T-level fluctuations are also observed in the H-component at Brorfelde, Denmark (55.6 deg N gm) and at Narsarsuaq, Greenland (70.6 deg N gm). Our study of the above observations shows that the E-W electric field fluctuations in the E- and F-regions and the magnetic field fluctuations at Thumba are dominated by a near-sinusoidal oscillation of 10 min during 1730-1900 IST (1200-1330 UT), the amplitude of the electric field oscillation in the equatorial electrojet (EEJ) is 0.1-0.25 mV/m and it increases with height, while it is about 1.0 mV/m in the F-region, the ground-level H-component oscillation can be accounted for by the ionospheric current oscillation generated by the observed electric field oscillation in the EEJ and the H-component oscillations at Trivandrum and Brofelde are in phase with each other. The observations are interpreted in terms of a compressional cavity mode resonance in the inner magnetosphere and the assoicated ionospheric electric field penetrating from high latitudes to the magnetic equator.
    Keywords: GEOPHYSICS
    Type: Annales Geophysicae (ISSN 0992-7689); 12; 6; p. 565-573
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    NASA TECHNICAL REPORTS
  • 3
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    Ionospheric drifts (1966)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Program to measure horizontal drifts in lower and upper ionospheres
    Keywords: GEOPHYSICS
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  • 4
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    Rocket observations of electron densities in the night-time auroral E-region at Fort Churchill, Canada. (1969)
    In:  Other Sources
    Details
    Publication Date: 2011-08-12
    Description: Rocket measured electron densities of nighttime auroral E region over Canada at different magnetic activity levels, noting frequency and plasma density relations
    Keywords: GEOPHYSICS
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  • 5
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    Results of rocket measurements of D-region ionization over Thumba in MAP (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Under MAP, two rockets were launched from Thumba (8.5 N, 76.8 E) around 1030 hrs Lt with identical payloads on 7 and 10 March 1986 for D region studies. Positive ion densities were measured by spherical probe and Gerdien condenser and electron densities were measured by Langmuir probe and propagation experiments. In both flights a valley in ionization height profile was noticed around 83 km. The density of ionization at this altitude was about 4 x 10(2) cu cm. A detailed positive ion-chemical scheme was used to reproduce the measured ionization height profiles. The density of NO needed to reproduce the valley in ionization at 83 km came around 5 x 10(5) cu cm. A photochemical treatment without diffusion process was found inadequate to explain this value of NO. Calculations showed that the value of vertical eddy diffusion needed to reproduce the value of NO was around 10(6)sq cm/s. Interestingly, the same value of eddy diffusion coefficient was obtained when derived in the manner described by Thrane and his coworkers using only the positive ion current data of spherical probes.
    Keywords: GEOPHYSICS
    Type: International Council of Scientific Unions, Middle Atmosphere Program. Handbook for MAP, volume 27; p 209-211
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  • 6
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    Geology and geochemistry of the Middle Proterozoic Eastern Ghat mobile belt and its comparison with the lower crust of the Southern Peninsular shield (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Two prominent rock suites constitute the lithology of the Eastern Ghat mobile belt: (1) the khondalite suite - the metapelites, and (2) the charnockite suite. Later intrusives include ultramafic sequences, anorthosites and granitic gneisses. The chief structural element in the rocks of the Eastern Ghats is a planar fabric (gneissosity), defined by the alignment of platy minerals like flattened quartz, garnet, sillimanite, graphite, etc. The parallelism between the foliation and the lithological layering is related to isoclinal folding. The major structural trend (axial plane foliation trend) observed in the belt is NE-SW. Five major tectonic events have been delineated in the belt. A boundary fault along the western margin of the Eastern Ghats, bordering the low grade terrain has been substantiated by recent gravity and the deep seismic sounding studies. Field evidence shows that the pyroxene granulites (basic granulites) post-date the khondalite suite, but are older than the charnockites as well as the granitic gneisses. Polyphase metamorphism, probably correlatable with different periods of deformation is recorded. The field relations in the Eastern Ghats point to the intense deformation of the terrain, apparently both before, during and after metamorphism.
    Keywords: GEOPHYSICS
    Type: Lunar and Planetary Inst., Workshop on the Deep Continental Crust of South India; p 151-152
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  • 7
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    Origin and evolution of Gneiss-Charnockite rocks of Dharmapuri District, Tamil Nadu, India (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A low- to high-grade transition area in Dharmapuri district was investigated petrologically and geochemically. The investigation confirmed the presence of a continuous section through a former lower crust, with felsic charnockites predominating the lower part and felsic gneisses the upper part. The structure of original gneisses is preserved in charnockites and the latter show petrographic evidence for prograde metamorphism. The prograde metamorphism is of isochemical nature as revealed by the similarity of compositions of tonalitic gneisses and tonalitic charnockites. However, the depletion of LIL elements particularly Rb, caused variation in K/Rb ratios from low values (345) in the gneisses in upper part to higher values (1775) in the charnockites in the lower crust. This variation in K/Rb ratio in a north to south traverse is related to the progressive break-down of hydrous minerals under decreasing H2O and increasing CO2 fluid conditions. Metasomatism and partial melting has also taken place to a limited extent along shear planes and weak zones. During cooling the H2O circulation affected substantial auto-regression in the transition zone resulting in the formation of second generation biotite.
    Keywords: GEOPHYSICS
    Type: Lunar and Planetary Inst., Workshop on the Deep Continental Crust of South India; p 147-148
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  • 8
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    Incoherent backscatter study of electron content and equivalent slab thickness. (1968)
    In:  Other Sources
    Details
    Publication Date: 2011-08-12
    Description: Electron content and equivalent slab thickness from radar backscatter measurements, noting F layer peak height and electron and ion temperatures diurnal variation
    Keywords: GEOPHYSICS
    Type: ; ADEMIE DES SCIENCES
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  • 9
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    Tectonic evolution of greenstone-Gneiss association in Dharwar Craton, South India: Problems and perspectives for future research (1986)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The two fold stratigraphic subdivision of the Archean-Proterozoic greenstone-gneiss association of Dharwar craton into an older Sargur group (older than 2.9 Ga.) and a younger Dharwar Supergroup serves as an a priori stratigraphic model. The concordant greenstone (schist)-gneiss (Peninsular gneiss) relationships, ambiguities in stratigraphic correlations of the schist belts assigned to Sargur group and difficulties in deciphering the older gneiss units can be best appreciated if the Sargur group be regarded as a trimodal association of: (1) ultrabasic-mafic metavolcanics (including komatiites), (2) clastic and nonclastic metasediments and paragneisses and (3) mainly tonalite/trondhemite gneisses and migmatites of diverse ages which could be as old as c. 3.4 ga. or even older. The extensive occurrence of this greenstone-gneiss complex is evident from recent mapping in many areas of central and southern Karnataka State.
    Keywords: GEOPHYSICS
    Type: Lunar and Planetary Inst. Workshop on the Tectonic Evolution of Greenstone Belts; p 9-10
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  • 10
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    Studies of the equatorial ionosphere using rocket techniques (1967)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Equatorial ionospheric propagation studies using rocket sounding techniques
    Keywords: GEOPHYSICS
    Type: NASA-CR-89742 , REPT.-20
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