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  • 1
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    Pc3 pulsations during variable IMF conditions (2008)
    EGS - Springer-Verlag
    Details
    Publication Date: 2017-04-04
    Description: Pc3 geomagnetic field fluctuations detected at low latitude (L'Aquila, Italy) during the passage of a high velocity solar wind stream, characterized by variable interplanetary magnetic field conditions, are analyzed. Higher frequency resonant fluctuations and lower frequency phenomena are simultaneously observed; the intermittent appearance and the variable frequency of the longer period modes can be well interpreted in terms of the variable IMF elements; moreover their polarization characteristics are consistent with an origin related to external waves propagating in antisunward direction. A comparison with simultaneous observations performed at Terra Nova Bay (Antarctica) provides additional evidence for a clear relationship between the IMF and Pc3 pulsations also at very high latitudes.
    Description: Published
    Description: 490-496
    Description: N/A or not JCR
    Description: reserved
    Keywords: Magnetospheric physics ; MHD waves and instabilities ; Solar wind-magnetosphere interactions ; 01. Atmosphere::01.03. Magnetosphere::01.03.99. General or miscellaneous ; 01. Atmosphere::01.03. Magnetosphere::01.03.02. Magnetic storms ; 01. Atmosphere::01.03. Magnetosphere::01.03.04. Structure and dynamics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
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    Geomagnetic field variations at low and high latitude during the January 10-11, 1997 magnetic cloud (2008)
    AGU
    Details
    Publication Date: 2017-04-04
    Description: On Jan. 10-11, 1997 a wide magnetic cloud reached the Earth triggering intense geomagnetic activity. Observations performed at low and very high latitude show that the same features appear simultaneously in correspondence to different changes in the solar wind conditions. In particular, highly polarized modes are simultaneously observed at the same discrete frequencies after the passage of the high density solar wind region following the cloud. SI's and ULF waves polarization are also examined in a wide latitudinal and longitudinal extent.
    Description: Published
    Description: 2593-2596
    Description: JCR Journal
    Description: open
    Keywords: Magnetic cloud ; Earth's magnetosphere ; Interplanetary Magnetic Field (IMF) ; geomagnetic storms ; 01. Atmosphere::01.03. Magnetosphere::01.03.99. General or miscellaneous ; 01. Atmosphere::01.03. Magnetosphere::01.03.02. Magnetic storms ; 01. Atmosphere::01.03. Magnetosphere::01.03.04. Structure and dynamics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 3
    Electronic Resource
    Electronic Resource
    On the local generation of interplanetary Alfvenic fluctuations
    Amsterdam : Elsevier
    Advances in Space Research 9 (1989), S. 131-133 
    Details
    ISSN: 0273-1177
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0273-1177(89)90106-3
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  • 4
    Electronic Resource
    Electronic Resource
    Some observations on the vital cycle of maize etioplasts: II. Plants supplied with saccharose
    Amsterdam : Elsevier
    Ultramicroscopy 12 (1983), S. 140-141 
    Details
    ISSN: 0304-3991
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology , Natural Sciences in General , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-3991(83)90410-2
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of endogenous phenols on rootability of Chamaelaucium uncinatum Schauer stem cuttings
    Amsterdam : Elsevier
    Scientia Horticulturae 55 (1993), S. 303-314 
    Details
    ISSN: 0304-4238
    Keywords: Chamaelaucium uncinatum ; Cuttings ; Phenols ; Rooting ability
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0304-4238(93)90041-N
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  • 6
    Electronic Resource
    Electronic Resource
    In-situ observations of the latitudinal gradients of the solar wind parameters during 1976 and 1977 (1986)
    Springer
    Solar physics 104 (1986), S. 431-445 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Interplanetary observations from Helios 1, Helios 2, and IMP-8 spacecraft during 1976 and 1977, namely the early portion of solar cycle 21, have been used to investigate the latitudinal gradients of the solar wind parameters with respect to the angular displacement from the current sheet inferred from synoptic HAO white-light maps of the solar corona at 1.75 solar radii. A latitudinal belt of ±25 deg around the current sheet has been investigated. Large gradients for solar wind flow speed, proton density and temperature have been found. Smoother gradients were also found for particle flux, kinetic, gravitational and thermal energy density flux. All these gradients revealed to become smoother going towards the solar cycle's maximum. Neither latitudinal nor temporal variations were identified for magnetic and thermal energy density. A remarkable result of this study is that the momentum flux density and the total energy flux density which other authors found to be independent of any longitudinal stream structure were also found to be independent of any latitudinal structure. Moreover, these two parameters did not show any temporal variation during the period of interest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00159093
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  • 7
    Electronic Resource
    Electronic Resource
    An extended investigation of Helios 1 and 2 observations: The interplanetary magnetic field between 0.3 and 1 AU (1979)
    Springer
    Solar physics 63 (1979), S. 411-421 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Helios-1 and 2 spacecraft allowed a detailed investigation of the radial dependence of the interplanetary magnetic field components between 0.3 and 1 AU. The behaviour of the radial component B ris in a very good agreement with Parker's model (B r∼ r -2) and the azimuthal component B φalso shows a radial dependence which is close to theoretical predictions (B φ∼ r -1). Experimental results for the normal component B θand for the field magnitude B are consistent with those from previous investigations. The relative amplitude of the directional fluctuations with periods less than 12 hr is essentially independent of heliocentric distance, while their power decreases approximately as r −3 without any appreciable difference between higher and lower velocity regimes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00174545
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  • 8
    Electronic Resource
    Electronic Resource
    Statistical properties of MHD fluctuations associated with high-speed streams from Helios-2 observations (1982)
    Springer
    Solar physics 78 (1982), S. 373-384 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A variance analysis of Helios-2 magnetic data has been used to derive several statistical properties of MHD fluctuations associated with the trailing edge of a given stream observed in different solar rotations. Such properties are derived both as a function of distance from the Sun and as a function of the frequency range included in the sample. The most noticeable result is that the radial gradients of various parameters, such as anisotropy and normalized power of the fluctuations, depend from frequency range. In particular the variation with distance of the normalized power does not correspond, for periods ≲ 1 hr, to what is expected from WKB propagation effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00151617
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  • 9
    Electronic Resource
    Electronic Resource
    A statistical study of MHD discontinuities in the inner solar system: Helios 1 and 2 (1983)
    Springer
    Solar physics 83 (1983), S. 349-365 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A statistical study is made of the magnetic field directional discontinuities observed in early 1976 onboard Helios 1 and 2. Strong day-to-day variations of occurrence rates are found on either tangential (TD) or rotational (RD) discontinuities. No large variation (if any) is found versus either heliocentric distance or heliographic latitude. This contradicts previous findings obtained by the same technique on Pioneer 8 data in 1968–69; however, reasons are given to expect different results, under different solar conditions. The most interesting results come from the study of the morphology of discontinuities: first of all, the orientation of TD's and RD's normals (identified by a minimum variance technique) are strongly organized by the average magnetic field, following their progressive directional change when approaching the Sun. The inclination (θ n ) and azimuthal (ϕ n ) distributions are gaussian and strongly peaked along the field lines for RD's; as regards TD's the normals are perpendicular to the average field and follow its progressive variation; the θ n distribution is isotropic in solid angle, which is interpreted as evidence of crossing of flux tubes on the order of one/hour. Implications of this interpretation in contrast with a turbulent approach are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00148285
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  • 10
    Electronic Resource
    Electronic Resource
    Search for long term variations of the interplanetary magnetic field (1975)
    Springer
    Solar physics 45 (1975), S. 241-254 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A statistical study is made of the long term variations of the interplanetary magnetic field parameters collected in the years 1964 to 1973 by 12 spacecraft (IMP's, Pioneers and HEOS). Although temporal fluctuations are observed on field components and magnitudes no clear solar cycle variation is found. The same conclusion holds for the statistical distributions and variances of these parameters. A search for possible heliographic latitude effects on the field also leads to a negative conclusion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00152235
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