A5091148249- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Geomagnetism and Paleomagnetism Studies
- Geophysics and Gravity Measurements
- Gamma-ray bursts and supernovae
- Solar Radiation and Photovoltaics
- Earthquake Detection and Analysis
- Oil, Gas, and Environmental Issues
- Astrophysics and Cosmic Phenomena
- Spacecraft and Cryogenic Technologies
- Magnetic confinement fusion research
- Pulsars and Gravitational Waves Research
- Medical Imaging Techniques and Applications
- Geological and Geophysical Studies
- Atmospheric Ozone and Climate
- Advanced X-ray Imaging Techniques
- Adaptive optics and wavefront sensing
- High-pressure geophysics and materials
- Global Energy and Sustainability Research
- Oil and Gas Production Techniques
- Atomic and Subatomic Physics Research
- Astrophysical Phenomena and Observations
- Spacecraft Design and Technology
Lockheed Martin (United States)
2014-2023
Lockheed Martin (Australia)
2009-2023
Lockheed Martin (United Kingdom)
2000-2023
Johns Hopkins University Applied Physics Laboratory
2023
Learning Multi Systems (United States)
2022
Imperial Valley College
2022
University of Hawaii System
2022
North-West University
2022
Princeton University
2022
K Lab (United States)
2007
We present the results of an investigation sequence events from Sun to Earth that ultimately led 88 major geomagnetic storms (defined by minimum Dst ≤ −100 nT) occurred during 1996–2005. The are achieved through cooperative efforts originated at Living with a Star (LWS) Coordinated Data‐Analysis Workshop (CDAW) held George Mason University in March 2005. On basis careful examination complete array solar and situ wind observations, we have identified characterized, for each storm, overall...
view Abstract Citations (170) References (14) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Gigantic Coronal Jet Ejected from a Compact Active Region in Hole Shibata, K. ; Nitta, N. Strong, T. Matsumoto, R. Yokoyama, Hirayama, Hudson, H. Ogawara, Y. gigantic coronal jet greater than 3 x 105 km long (nearly half the solar radius) has been found with soft X-ray telescope (SXT) on board satellite, Yohkoh. The was ejected 1992 January 11 an 'anemone-type'...
We present the first unambiguous detection of quasi-periodic wave trains within broad pulse a global EUV (so-called "EIT wave") occurring on limb. These trains, running ahead lateral CME front 2-4 times slower, coherently travel to distances $>R_{sun}/2$ along solar surface, with initial velocities up 1400 km/s decelerating ~650 km/s. The rapid expansion initiated at an elevated height 110 Mm produces strong downward and compression, which may play important role in driving primary shaping...
We study the interaction of two successive coronal mass ejections (CMEs) during 2010 August 1 events using STEREO/SECCHI COR and HI data. obtain direction motion for both CMEs by applying several independent reconstruction methods find that head in similar directions. This provides evidence a full takes place between can be observed HI1 field-of-view. The de-projected kinematics faster CME from Sun to Earth is derived combining remote observations with situ measurements at AU. speed profile...
This paper presents a study of large sample global disturbances in the solar corona with characteristic propagating fronts as intensity enhancement, similar to phenomena that have often been referred EIT waves or EUV waves. Now Extreme Ultraviolet (EUV) images obtained by {\it Atmospheric Imaging Assembly} (AIA) on board Solar Dynamics Observatory} (SDO) provide significantly improved view these large-scale coronal (LCPFs). Between April 2010 and January 2013, total 171 LCPFs identified...
A prevailing model for the origin of 3He-rich solar energetic particle (SEP) events attributes acceleration to processes associated with reconnection between closed magnetic field lines in an active region and neighboring open lines. The from small volume then provides a path along which accelerated particles escape into relatively narrow range angles heliosphere. width (standard deviation <20°) distribution X-ray flare longitudes found be SEP detected at single spacecraft 1 AU supports this...
Abstract Current state-of-the-art spectrographs cannot resolve the fundamental spatial (subarcseconds) and temporal (less than a few tens of seconds) scales coronal dynamics solar flares eruptive phenomena. The highest-resolution data to date are based on imaging, which is blind many processes that drive energetics dynamics. As shown by Interface Region Imaging Spectrograph for low atmosphere, we need high-resolution spectroscopic measurements with simultaneous imaging understand dominant...
A solar flare was observed on 1997 April 7 with the Soft X-ray Telescope (SXT) Yohkoh. The associated a "halo" coronal mass ejection (CME). flaring region showed areas of reduced soft (SXR) brightness—"dimmings"—that developed prior to CME in white light and persisted for several hours following CME. most prominent dimming regions were located near ends preflare SXR S-shaped (sigmoid) feature that disappeared during event, leaving behind postflare arcade cusp structure. Based upon these...
We have analyzed the coronal dimmings for seven fast (> 600 km/s) mass ejections (CMEs) occurring between 23 April and 9 May which were associated with flares from NOAA active region (AR) 8210. Each of these CMEs had at least one group interplanetary radio bursts them. These dimming regions identified by their strong depletion in EUV emission within a half hour estimated time CME lift‐off. They included areas as dark quiescent holes well other weaker brightness depletions. While location...
This paper investigates the solar origin of impulsive energetic particle (SEP) events, often referred to as 3He-rich flares, by attempting locate source regions 117 events observed at ~2-3 MeV amu-1. Given large uncertainties when ions these energies were injected, we use type III radio bursts that occur within a 5 hr time window preceding ion onset, and search in EUV X-ray full-disk images for brightenings around times bursts. In this way find sources 69 events. High cadence reveal jet...
We present one of the first triangulations and 3D reconstructions coronal loops, using EUVI telescopes two STEREO A B spacecraft. The triangulation loops was performed in an active region, observed with on 2007 May 9 a spacecraft separation angle αsep = 7.3°, at wavelength 171 Å. identify 30 loop structures (7 complete 23 partial segments) compute their coordinates (x,y,z) (the full are available as electronic file). quantify height range, stereoscopic measurement errors, plane inclination...
We present the first SDO AIA observations of a global coronal EUV disturbance (so-called "EIT wave") revealed in unprecedented detail. The observed on 2010 April 8 exhibits two components: one diffuse pulse superimposed which are multiple sharp fronts that have slow and fast components. originates front erupting loops some undergo accelerations, both effects implying is driven by CME. pulse, propagating at uniform velocity 204-238 km/s with very little angular dependence within its extent...
We present multi-point in situ observations of a complex sequence coronal mass ejections (CMEs) which may serve as benchmark event for numerical and empirical space weather prediction models. On 2010 August 1, instruments on various missions, Solar Dynamics Observatory/Solar Heliospheric Observatory/Solar-TErrestrial-RElations-Observatory (SDO/SOHO/STEREO), monitored several CMEs originating within tens degrees from the solar disk center. compare their imprints four widely separated...
On 2010 August 1, the northern solar hemisphere underwent significant activity that involved a complex set of active regions near central meridian with, nearby, two large prominences and other more distant regions. This culminated in eruption four major coronal mass ejections (CMEs), effects which were detected at Earth system bodies. Recognizing unprecedented wealth data from wide range spacecraft available—providing potential for us to explore methods CME identification tracking, assess...
Solar coronal sigmoidal active regions have been shown to be precursors some mass ejections. Sigmoids, or S-shaped structures, may indicators of twisted helical magnetic having an increased likelihood eruption. We present here analysis a region's three-dimensional structure and how it evolves in relation its eruptive dynamics. use data taken during recent study region passing across the solar disk (an element third Whole Sun Month campaign). While structures are generally observed soft X-ray...
Using the stereoscopically derived three-dimensional (3D) geometry of 30 loops observed with STEREO EUVI (described in Paper I) we determine here electron density profiles ne(s) and temperature Te(s) from a triple-filter analysis stereoscopic images taken wavelengths λ = 171, 195, 284 Å. The statistical results our seven complete are: loop widths wobs 2.6 ± 0.1 Mm, corresponding to effective w 1.1 0.3 Mm if corrected for instrumental point-spread function; flux ratios floop/ftotal 0.11 0.04;...
By measuring the geometrical properties of coronal mass ejection (CME) flux rope and leading shock observed on 2010 June 13 by Solar Dynamics Observatory (SDO) mission's Atmospheric Imaging Assembly we determine Alfvén speed magnetic field strength in inner corona at a heliocentric distance ∼1.4 Rs. The basic measurements are standoff (ΔR) ahead CME rope, radius curvature (Rc), speed. We first derive Alfvénic Mach number (M) using relationship, ΔR/Rc = 0.81[(γ−1) M2 + 2]/[(γ+1)(M2 − 1)],...