Search Publications
Interplanetary coronal mass ejections from MESSENGER orbital observations at Mercury
Lugaz, Noé; Farrugia, Charles J.; Schwadron, Nathan A. +4 more
We use observations from the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) spacecraft, in orbit around Mercury, to investigate interplanetary coronal mass ejections (ICMEs) near 0.3 AU. MESSENGER is the first spacecraft since Helios 1 and 2 in the 1980s to make in situ measurements of the interplanetary medium at helioc…
Data-driven modeling of the solar wind from 1 Rs to 1 AU
Feng, Xueshang; Xiang, Changqing; Ma, Xiaopeng
We present here a time-dependent three-dimensional magnetohydrodynamic (MHD) solar wind simulation from the solar surface to the Earth's orbit driven by time-varying line-of-sight solar magnetic field data. The simulation is based on the three-dimensional (3-D) solar-interplanetary (SIP) adaptive mesh refinement (AMR) space-time conservation eleme…
UV solar irradiance in observations and the NRLSSI and SATIRE-S models
Solanki, S. K.; Yeo, K. L.; Krivova, N. A. +3 more
Total solar irradiance and UV spectral solar irradiance has been monitored since 1978 through a succession of space missions. This is accompanied by the development of models aimed at replicating solar irradiance by relating the variability to solar magnetic activity. The Naval Research Laboratory Solar Spectral Irradiance (NRLSSI) and Spectral An…
Analysis of a coronal mass ejection and corotating interaction region as they travel from the Sun passing Venus, Earth, Mars, and Saturn
Harra, L. K.; Arridge, C. S.; Matthews, S. A. +2 more
During June 2010 a good alignment in the solar system between Venus, STEREO-B, Mars, and Saturn provided an excellent opportunity to study the propagation of a coronal mass ejection (CME) and closely occurring corotating interaction region (CIR) from the Sun to Saturn. The CME erupted from the Sun at 01:30 UT on 20 June 2010,with v≈ 600 km s-…
Kinematics of interacting CMEs of 25 and 28 September 2012
Srivastava, Nandita; Mishra, Wageesh; Singh, Talwinder
We have studied two coronal mass ejections (CMEs) that occurred on 25 and 28 September 2012 and interacted near the Earth. By fitting the Graduated Cylindrical Shell model on the SECCHI/COR2 images and applying the Stereoscopic Self-Similar Expansion method on the SECCHI/HI images, the initial direction of both the CMEs is estimated to be west of …
Are 3-D coronal mass ejection parameters from single-view observations consistent with multiview ones?
Moon, Y. -J.; Jang, Soojeong; Lee, Harim +2 more
To prepare for when only single-view observations are available, we have made a test whether the 3-D parameters (radial velocity, angular width, and source location) of halo coronal mass ejections (HCMEs) from single-view observations are consistent with those from multiview observations. For this test, we select 44 HCMEs from December 2010 to Jun…
Internal structure of a coronal mass ejection revealed by Akatsuki radio occultation observations
Isobe, H.; Imamura, T.; Häusler, B. +6 more
A coronal mass ejection (CME) was observed at the heliocentric distance of 12.7 Rυ by radio occultation measurements using the Akatsuki spacecraft. The temporal developments of the bulk velocity and the electron column density along the raypath traversing the CME were obtained, and under the assumption that the irregularities are transp…
Characteristics of four SPE groups with different origins and acceleration processes
Cho, K. -S.; Kim, R. -S.; Park, Y. -D. +3 more
Solar proton events (SPEs) can be categorized into four groups based on their associations with flare or CME inferred from onset timings as well as acceleration patterns using multienergy observations. In this study, we have investigated whether there are any typical characteristics of associated events and acceleration sites in each group using 4…