Search Publications
Resolving the enigmatic solar wind disappearance event of 11 May 1999
Janardhan, P.; Tokumaru, M.; Kojima, M. +2 more
On 11 and 12 May 1999, the Earth was engulfed by an unusually low-density (<1 cm-3) and low-velocity (<350 km s-1) solar wind for a period of over 1 day. Extensive studies of this unusual event that occurred during Carrington rotation 1949 (CR1949), using both ground-based and space-based in situ observations, have not …
Stability of the inner source pickup ions over the solar cycle
Geiss, J.; McComas, D. J.; Schwadron, N. A. +2 more
Inner source pickup ions (PUIs) were discovered and are observed by Ulysses. They are thought to be generated by solar wind interaction with dust grains near the Sun. From previous work, four constraints were derived on inner source PUIs from observations near solar minimum: (1) the composition resembles the solar wind; (2) the distribution functi…
Multipoint observations of transient reconnection signatures in the cusp precipitation: A Cluster-IMAGE detailed case study
Budnik, E.; Berchem, J.; Escoubet, C. P. +10 more
This paper uses 90 min of Cluster multipoint data at ∼5 RE altitude together with global dayside imaging data provided by the IMAGE-SI-12 instrument to analyze the northern cusp crossed on 14 July 2001, during a period of high solar wind pressure Psw and strongly duskward interplanetary magnetic field (IMF). Simultaneous obse…
Global structure of the out-of-ecliptic solar wind
Burlaga, L. F.; Sheeley, N. R.; Wang, Y. -M. +1 more
We use the observed photospheric field maps and the wind speed observed from Ulysses to study the out-of-ecliptic solar wind. The model calculates the wind speed from the rate of magnetic flux tube expansion factors using a conversion function that is determined by least squares fit of all currently available data from Ulysses. Using the best fit …
Initial localization and kinematic characteristics of the structural components of a coronal mass ejection
Hudson, H. S.; Grechnev, V. V.; Uralov, A. M.
The leading component of a coronal mass ejection (CME), its observed frontal structure (FS), has been detected close to the solar surface in a few near-the-limb events only. Thus far, no manifestations of such a frontal structure have been reported in reasonable proximity to a preeruptive filament located away from the solar limb. Thus the identif…
Hybrid simulation of ion cyclotron resonance in the solar wind: Evolution of velocity distribution functions
Li, Xing; Habbal, Shadia R.
Resonant interaction between ions (oxygen ions O+5 and protons) and ion cyclotron waves is investigated using a one dimensional hybrid code. Ion cyclotron waves are self-consistently generated by an ion cyclotron anisotropy instability. We focus on the detailed acceleration process of ions. The energization of oxygen ions due to waves i…
Cluster vision of the magnetotail current sheet on a macroscale
Petrukovich, A. A.; Balogh, A.; Nakamura, R. +2 more
With Cluster 2001-2003 observations at ∼20 RE downtail we determine the cross-tail current sheet configuration via mapping of the neutral sheet positions and direct measurements of the sheet inclination. The warping effect tilts both flanks of the sheet up to 40° in the YZ GSM plane, while the gradual hinging effect tilts the sheet up t…
A universal characteristic of type II radio bursts
Kaiser, M. L.; Gopalswamy, N.; Aguilar-Rodriguez, E. +2 more
We present a study on the spectral properties of interplanetary type II radio bursts observed by the Radio and Plasma Wave (WAVES) experiment on board the Wind spacecraft. We investigated the relative bandwidth of the type II radio bursts observed by WAVES from 1997 up to 2003. We obtained three sets of events, based on the frequency domain of occ…
Three-dimensional estimates of the coronal electron density at times of extreme solar activity
Frazin, R. A.; Butala, M. D.; Kamalabadi, F.
This paper presents quantitative three-dimensional (3-D) reconstructions of the electron density (Ne) in the solar corona between 1.14 and 2.7 solar radii (R⊙) formed from polarized brightness (pB) measurements made by the Mauna Loa Solar Observatory Mark-IV (Mk4) K-coronameter at the time of the extreme solar events of Octob…
On the origin and configuration of the 20 March 2003 interplanetary shock and magnetic cloud at 1 AU
Richardson, I. G.; Lepping, R. P.; Martin, S. F. +1 more
On 20 March 2003, a forward shock was observed in the near-Earth solar wind, followed 8 hours later by an interplanetary magnetic cloud (IMC), in a configuration having several uncommon features: Both were parts of a 38-hour interval containing transient solar outflows that occurred in an extended high-speed stream from a Y-shaped extension of the…