Search Publications
A stochastic sea: The source of plasma sheet boundary layer ion structures observed by Cluster
Zelenyi, L. M.; El-Alaoui, M.; Walker, R. J. +4 more
On 14 February 2001 the Cluster Ion Spectrometry (CIS) experiment onboard three of the Cluster spacecraft observed velocity-dispersed ion structures (VDIS) as the spacecraft passed from the tail lobes into the plasma sheet boundary layer. These are the first multiple spacecraft observations of the VDIS phenomenon. The Cluster 1 spacecraft (SC1) ob…
CORONAS-F/SPIRIT EUV observations of October-November 2003 solar eruptive events in combination with SOHO/EIT data
Grechnev, V. V.; Chertok, I. M.; Kuzin, S. V. +6 more
The extraordinary solar activity of October-November 2003 manifested itself in many powerful eruptive events, including large coronal mass ejections (CMEs) and extremely powerful flares. A number of major events were accompanied by practically all known phenomena of the solar activity, both local and large-scale, and caused severe space weather di…
Coronal mass ejection kinematics deduced from white light (Solar Mass Ejection Imager) and radio (Wind/WAVES) observations
Webb, D. F.; Kaiser, M. L.; Jackson, B. V. +3 more
White-light and radio observations are combined to deduce the coronal and interplanetary kinematics of a fast coronal mass ejection (CME) that was ejected from the Sun at about 1700 UT on 2 November 2003. The CME, which was associated with an X8.3 solar flare from W56°, was observed by the Mauna Loa and Solar and Heliospheric Observatory (SOHO) La…
Toward magnetic field dissipation during the 23 July 2002 solar flare measured with Solar and Heliospheric Observatory/Michelson Doppler Imager (SOHO/MDI) and Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI)
Zharkova, Valentina V.; Zharkov, Sergey I.; Ipson, Stanley S. +1 more
We analyze the SOHO/MDI high-cadence magnetic field variations that occurred in a bipolar area around the apparent neutral line (ANL) prior to and during the 2B/X4.8 flare on 23 July 2002 and their association with the hard X-ray (HXR) and Hα emission observed with RHESSI and BBSO. Magnetic field changes started 6 min prior to the hard …
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…