scholarly journals Venus and solar storms: Solar Energetic Particles, Stream Interaction Regions and Coronal Mass Ejections

2021 ◽  
Vol 53 (4) ◽  
Author(s):  
Shannon Curry ◽  
Janet Luhmann ◽  
Candance Gray ◽  
Glyn Collinson
Keyword(s):  
Coronal Mass Ejections ◽  
Energetic Particles ◽  
Solar Energetic Particles ◽  
Interaction Regions ◽  
Solar Storms

Energetic Particle Environment near the Sun from Parker Solar Probe

2020 ◽  
Author(s):  
Nathan Schwadron ◽  
Keyword(s):  
Energetic Particle ◽  
Energetic Particles ◽  
Solar Energetic Particles ◽  
Radiation Environment ◽  
The Sun ◽  
Particle Radiation ◽  
Integrated Science ◽  
Direct Observations ◽  
Interaction Regions ◽  
Inner Heliosphere

<p>NASA’s Parker Solar Probe (PSP) mission recently plunged through the inner heliosphere to perihelia at ~24 million km (~35 solar radii), much closer to the Sun than any prior human made object. Onboard PSP, the Integrated Science Investigation of the Sun (ISʘIS) instrument suite made groundbreaking measurements of solar energetic particles (SEPs). Here we discuss the near-Sun energetic particle radiation environment over PSP’s first two orbits, which reveal where and how energetic particles are energized and transported. We find a great variety of energetic particle events accelerated both locally and remotely. These include co-rotating interaction regions (CIRs), “impulsive” SEP events driven by acceleration near the Sun, and events related to Coronal Mass Ejections (CMEs). These ISʘIS observations made so close to the Sun provide critical information for investigating the near-Sun transport and energization of solar energetic particles that was difficult to resolve from prior observations. We discuss the physics of particle acceleration and transport in the context of various theories and models that have been developed over the past decades. This study marks a major milestone with humanity’s reconnaissance of the near-Sun environment and provides the first direct observations of the energetic particle radiation environment in the region just above the corona.</p>

scholarly journals How Efficient are Coronal Mass Ejections at Accelerating Solar Energetic Particles?

2008 ◽  
Author(s):  
R. A. Mewaldt ◽  
C. M. S. Cohen ◽  
J. Giacalone ◽  
G. M. Mason ◽  
E. E. Chollet ◽  
...  
Keyword(s):  
Coronal Mass Ejections ◽  
Energetic Particles ◽  
Solar Energetic Particles

scholarly journals Very narrow coronal mass ejections producing solar energetic particles

2018 ◽  
Vol 619 ◽  
pp. A34 ◽  
Author(s):  
K. Bronarska ◽  
M. S. Wheatland ◽  
N. Gopalswamy ◽  
G. Michalek
Keyword(s):  
Coronal Mass Ejections ◽  
Weather Forecasting ◽  
Coronal Holes ◽  
Energetic Particles ◽  
Solar Energetic Particles ◽  
Low Energy ◽  
Angular Width ◽  
Arrival Times ◽  
Kolmogorov Smirnov ◽  
Solar Particles

Aims. Our main aim is to study the relationship between low-energy solar particles (energies below 1 MeV) and very narrow coronal mass ejections (“jets” with angular width ≤ 20°). Methods. For this purpose, we considered 125 very narrow coronal mass ejections (CMEs) from 1999 to 2003 that are potentially associated with low-energy solar particles (LESPs). These events were chosen on the basis of their source location. We studied only very narrow CMEs at the western limb, which are expected to have good magnetic connectivity with Earth. Results. We found 24 very narrow CMEs associated with energetic particles such as ions (protons and 3He), electrons, or both. We show that arrival times at Earth of energetic particles are consistent with onset times of the respective CMEs, and that in the same time intervals, there are no other potential sources of energetic particles. We also demonstrate statistical differences for the angular width distributions using the Kolmogorov–Smirnov test for angular widths for these 24 events. We consider a coherent sample of jets (mostly originating from boundaries of coronal holes) to identify properties of events that produce solar energetic particles (velocities, widths, and position angles). Our study presents a new approach and result: very narrow CMEs can generate low-energy particles in the vicinity of Earth without other activity on the Sun. The results could be very useful for space weather forecasting.

Solar Energetic Particles and Radio‐silent Fast Coronal Mass Ejections

2006 ◽  
Vol 642 (2) ◽  
pp. 1222-1235 ◽  
Author(s):  
C. Marque ◽  
A. Posner ◽  
K.‐L. Klein
Keyword(s):  
Coronal Mass Ejections ◽  
Energetic Particles ◽  
Solar Energetic Particles

scholarly journals Interacting Coronal Mass Ejections and Solar Energetic Particles

2002 ◽  
Vol 572 (1) ◽  
pp. L103-L107 ◽  
Author(s):  
N. Gopalswamy ◽  
S. Yashiro ◽  
G. Michałek ◽  
M. L. Kaiser ◽  
R. A. Howard ◽  
...  
Keyword(s):  
Coronal Mass Ejections ◽  
Energetic Particles ◽  
Solar Energetic Particles

scholarly journals Non-interacting coronal mass ejections and solar energetic particles near the quadrature configuration of Solar TErrestrial RElations Observatory

2020 ◽  
Vol 638 ◽  
pp. A42
Author(s):  
Anitha Ravishankar ◽  
Grzegorz Michałek
Keyword(s):  
Shock Waves ◽  
Coronal Mass Ejections ◽  
Energetic Particles ◽  
Solar Energetic Particles ◽  
Poor Correlation ◽  
Maximum Speed ◽  
Energy Bands ◽  
Energy Channel ◽  
Peak Flux ◽  
Cycle 24

We present our results on the correlation of non-interacting coronal mass ejections (CMEs) and solar energetic particles (SEPs). A statistical analysis was conducted on 25 SEP events and the associated CME and flare during the ascending phase of solar cycle 24, i.e., 2009–2013, which marks the quadrature configuration of Solar TErrestrial RElations Observatory (STEREO). The complete kinematics of CMEs is well studied near this configuration of STEREO. In addition, we have made comparison studies of STEREO and SOlar and Heliospheric Observatory results. It is well known that the CME speeds and SEP intensities are closely correlated. We further examine this correlation by employing instantaneous speeds (maximum speed and the CME speed and Mach number at SEP peak flux) to check whether they are a better indicator of SEP fluxes than the average speed. Our preliminary results show a better correlation by this approach. In addition, the correlations show that the fluxes of protons in energy channel >10 MeV are accelerated by shock waves generated by fast CMEs, whereas the particles of >50 MeV and >100 MeV energy bands are mostly accelerated by the same shock waves but partly by the associated flares. In contrast, the X-ray flux of solar flares and SEP peak flux show a poor correlation.

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