Results
author = "Lepping, R. P."
Long-duration magnetic clouds: a comparison of analyses using torus- and cylinder-shaped flux rope models
Description :
We identified 17 magnetic clouds (MCs) with durations longer than 30 h, surveying the solar wind data obtained by the WIND and ACE spacecraft during 10 years from 1995 through 2004. Then, the magnetic field structures of these 17 MCs were analyzed by the technique of the least-squares fitting to for...
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HAL - Hyper Article on Line
Language(s) :
English
Solar cycle effect on geomagnetic storms caused by interplanetary magnetic clouds
Description :
We investigated geomagnetic activity which was induced by interplanetary magnetic clouds during the past four solar cycles, 1965?1998. We have found that the intensity of such geomagnetic storms is more severe in solar maximum than in solar minimum. In addition, we affirm that the average solar wind...
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HAL - Hyper Article on Line
Language(s) :
English
Comparison of magnetic field observations of an average magnetic cloud with a simple force free model: the importance of field compression and expansion
Description :
We investigate the ability of the cylindrically symmetric force-free magnetic cloud (MC) fitting model of Lepping et al. (1990) to faithfully reproduce actual magnetic field observations by examining two quantities: (1) a difference angle, called ?, i.e., the angle between the direction of th...
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HAL - Hyper Article on Line
Language(s) :
English
Automatic identification of magnetic clouds and cloud-like regions at 1 AU: occurrence rate and other properties
Description :
A scheme is presented whose purpose is twofold: (1) to enable the automatic identification of an interplanetary magnetic cloud (MC) passing Earth from real-time measurements of solar wind magnetic field and plasma quantities or (2) for on-ground post-data collection MC identification ("detection" mo...
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HAL - Hyper Article on Line
Language(s) :
English
Superposed epoch analysis applied to large-amplitude travelling convection vortices
Description :
For the six months from 1 October 1993 to 1 April 1994 the recordings of the IMAGE magnetometer network have been surveyed in a search for large-amplitude travelling convection vortices (TCVs). The restriction to large amplitudes (>100 nT) was chosen to ensure a proper detection of evens also during...
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HAL - Hyper Article on Line
Language(s) :
English
The Earth's passage of the April 11, 1997 coronal ejecta: geomagnetic field fluctuations at high and low latitude during northward interplanetary magnetic field conditions
Description :
An analysis of the low frequency geomagnetic field fluctuations at an Antarctic (Terra Nova Bay) and a low latitude (L'Aquila, Italy) station during the Earth's passage of a coronal ejecta on April 11, 1997 shows that major solar wind pressure variations were followed at both stations by a high fluc...
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HAL - Hyper Article on Line
Language(s) :
English
Radial and latitudinal dependencies of discontinuities in the solar wind between 0.3 and 19 AU and ?80° and +10°
Description :
Directional discontinuities (DD) from 5 missions at 7 different locations between 0.3 and 19 AU and ?80° and +10° in the 3D heliosphere are investigated during minimum solar activity. The data are surveyed using the identification criteria of Burlaga (1969) (B) and Tsurutani and Smith (1979) (TS). T...
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HAL - Hyper Article on Line
Language(s) :
English
Orientations of LASCO Halo CMEs and Their Connection to the Flux Rope Structure of Interplanetary CMEs
Description :
Coronal mass ejections (CMEs) observed near the Sun via LASCO coronographic
imaging are the most important solar drivers of geomagnetic storms. ICMEs,
their interplanetary, near-Earth counterparts, can be detected in-situ, for
example, by the Wind and ACE spacecraft. An ICME usually exhibits a com...
Repository :
arXiv
Language(s) :
Undetermined
Pc3 pulsations during variable IMF conditions
Author(s) :
Villante, U.
,
Lepidi, S.
,
Francia, P.
,
Vellante, M.
,
Meloni, A.
,
Lepping, R. P.
,
Mariani, F.
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 simultaneo...
Repository :
HAL - Hyper Article on Line
Language(s) :
English
Double discontinuities at the magnetotail plasma sheet-lobe boundary
Author(s) :
Whang, Y. C.
,
Fairfield, D.
,
Lepping, R. P.
,
Mukai, T.
,
Saito, Y.
,
Slavin, J.
,
Szabo, A.
Description :
A double discontinuity is a compound structure composed of a slow shock layer and an adjoining rotational discontinuity layer on the postshock side. We use high-resolution data from Geotail and Wind spacecraft to examine the interior structure within the finite thickness of the discontinuity at the ...
Repository :
HAL - Hyper Article on Line
Language(s) :
English