Geoeffectiveness of three Wind magnetic clouds: A comparative study

Farrugia, C. J.; Scudder, J. D.; Freeman, M. P.; Janoo, L.; Lu, G.; Quinn, J. M.; Arnoldy, R. L.; Torbert, R. B.; Burlaga, L. F.; Ogilvie, K. W.; Lepping, R. P.; Lazarus, A. J.; Steinberg, J. T.; Gratton, F. T.; Rostoker, G.

doi:10.1029/98ja00886

Cited by 41 publications

(28 citation statements)

References 41 publications

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“…We note, however, that the exact delay at each time is strongly dependent on the location of the satellite, the solar wind speed, the location of the magnetopause (which dynamically changes with interplanetary conditions, as described in Russell et al, 2000), the state of the ionosphere (in particular the ionization level, which changes with season) and geomagnetic activity. We recall that previous studies demonstrated that several interplanetary events, although having rather similar temporal pro®les of the interplanetary parameters, show major dierences in the magnetospheric response (e.g., Farrugia et al, 1998). In addition we note that in Fig.…”

Section: Correlations Between the Hf Scattering Occurrence At Dierentmentioning

confidence: 79%

The influence of the interplanetary medium on SuperDARN radar scattering occurrence

Ballatore¹,

Villain²,

Vilmer

et al. 2001

Annales Geophysicae

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Abstract. The eects of the characteristics of the interplanetary medium on the radar scattering occurrence, related to the whole array of SuperDARN radars installed in the Northern Hemisphere, have been studied over a two-year period. Statistically signi®cant correlations of the variation of the scattering occurrence are found with the merging electric ®eld and with the negative B z component of the interplanetary magnetic ®eld, independent of the seasonal period considered. This result demonstrates that the merging rate (and in particular the reconnection process) between the interplanetary magnetic ®eld and the magnetosphere is a relevant factor aecting the occurrence of scattering. For comparison, we note that no statistically signi®cant correlations are obtained when the interplanetary ion density or the solar wind speed are considered, although also these variables aect to a small degree the scattering occurrence variation. The study of the latitudinal and magnetic local time dependence of the observations shows an association between the considered correlation and the location of the auroral oval and the cusp/cleft region.

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Section: Correlations Between the Hf Scattering Occurrence At Dierentmentioning

confidence: 79%

The influence of the interplanetary medium on SuperDARN radar scattering occurrence

Ballatore¹,

Villain²,

Vilmer

et al. 2001

Annales Geophysicae

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show abstract

“…Farrugia et al, 1998;Richardson, Cliver, and Kane, 2000;Zhao and Webb, 2003). Others only analyze the geomagnetic storms related to ejecta or magnetic clouds (e.g.…”

Section: Introductionmentioning

confidence: 98%

Sources of intense geomagnetic storms over the rise of solar cycle 23

et al. 2004

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In this work we present a study of the triggers of intense geomagnetic storms since the launch of the WIND spacecraft, November 1995 until December 2001. Reviewing the signatures of solar wind flow, we looked for two different kinds of interplanetary events associated with intense geomagnetic storms: ejecta and corotating solar wind streams. We also looked for the solar origin related to both events. We provide a list of the solar-terrestrial events during the rising phase of this solar cycle. The paper includes statistical conclusions that shed light onto the paradigm of geomagnetic storms.

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“…Sandholt and Farrugia, 2006). Intervals of ICME passage at Earth were selected because of the strong and ordered forcing of the magnetosphere which occur in such cases (Burlaga et al, 1981;Farrugia et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

Polar cap flow channel events: spontaneous and driven responses

2010

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Abstract. We present two case studies of specific flow channel events appearing at the dusk and/or dawn polar cap boundary during passage at Earth of interplanetary (IP) coronal mass ejections (ICMEs) on 10 January and 25 July 2004. The channels of enhanced (>1 km/s) antisunward convection are documented by SuperDARN radars and dawn-dusk crossings of the polar cap by the DMSP F13 satellite. The relationship with Birkeland currents (C1-C2) located poleward of the traditional R1-R2 currents is demonstrated. The convection events are manifest in ground magnetic deflections obtained from the IMAGE (International Monitor for Auroral Geomagnetic Effects) Svalbard chain of ground magnetometer stations located within 71-76 • MLAT. By combining the ionospheric convection data and the ground magnetograms we are able to study the temporal behaviour of the convection events. In the two ICME case studies the convection events belong to two different categories, i.e., directly driven and spontaneous events. In the 10 January case two sharp southward turnings of the ICME magnetic field excited corresponding convection events as detected by IMAGE and SuperDARN. We use this case to determine the ground magnetic signature of enhanced flow channel events (the NHdusk/B y < 0 variant). In the 25 July case a several-hour-long interval of steady southwest ICME field (B z < 0; B y < 0) gave rise to a long series of spontaneous convection events as detected by IMAGE when the ground stations swept through the 12:00-18:00 MLT sector. From the ground-satellite conjunction on 25 July we infer the pulsed nature of the polar cap ionospheric flow channel events in this case. The typical duration of these convection enhancements in the polar cap is 10 min.

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Geoeffectiveness of three Wind magnetic clouds: A comparative study

Cited by 41 publications

References 41 publications

The influence of the interplanetary medium on SuperDARN radar scattering occurrence

The influence of the interplanetary medium on SuperDARN radar scattering occurrence

Sources of intense geomagnetic storms over the rise of solar cycle 23

Polar cap flow channel events: spontaneous and driven responses

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