A Catalog of Interplanetary Coronal Mass Ejections Observed by Juno between 1 and 5.4 au

2021 ◽  
Vol 923 (2) ◽  
pp. 136
Author(s):  
Emma E. Davies ◽  
Robert J. Forsyth ◽  
Réka M. Winslow ◽  
Christian Möstl ◽  
Noé Lugaz
Keyword(s):  
Magnetic Field ◽  
Coronal Mass Ejections ◽  
Flux Rope ◽  
Field Measurements ◽  
Interplanetary Coronal Mass Ejections ◽  
Double Logarithmic Plot ◽  
Data Set ◽  
Magnetic Flux Ropes ◽  
Combined Data ◽  
Good Agreement

Abstract We use magnetic field measurements by the Juno spacecraft to catalog and investigate interplanetary coronal mass ejections (ICMEs) beyond 1 au. During its cruise phase, Juno spent about 5 yr in the solar wind between 2011 September and 2016 June, providing measurements of the interplanetary magnetic field (IMF) between 1 and 5.4 au. Juno therefore presents the most recent opportunity for a statistical analysis of ICME properties beyond 1 au since the Ulysses mission (1990–2009). Our catalog includes 80 such ICME events, 32 of which contain associated flux-rope-like structures. We find that the dependency of the mean magnetic field strength of the magnetic flux ropes decreases with heliocentric distance as r −1.24±0.43 between 1 and 5.4 au, in good agreement with previous relationships calculated using ICME catalogs at Ulysses. We combine the Juno catalog with the HELCATS catalog to create a data set of ICMEs covering 0.3–5.4 au. Using a linear regression model to fit the combined data set on a double-logarithmic plot, we find that there is a clear difference between global expansion rates for ICMEs observed at shorter heliocentric distances and those observed farther out beyond 1 au. The cataloged ICMEs at Juno present a good basis for future multispacecraft studies of ICME evolution between the inner heliosphere, 1 au, and beyond.

scholarly journals On the relationship between interplanetary coronal mass ejections and magnetic clouds

2013 ◽  
Vol 31 (7) ◽  
pp. 1251-1265 ◽  
Author(s):  
E. K. J. Kilpua ◽  
A. Isavnin ◽  
A. Vourlidas ◽  
H. E. J. Koskinen ◽  
L. Rodriguez
Keyword(s):  
Solar Wind ◽  
Coronal Mass Ejections ◽  
Flux Rope ◽  
Leading Edge ◽  
Magnetic Clouds ◽  
Interplanetary Coronal Mass Ejections ◽  
Magnetic Flux Ropes ◽  
Geometrical Effect ◽  
Relationship Of ◽  
The Relationship

Abstract. The relationship of magnetic clouds (MCs) to interplanetary coronal mass ejections (ICMEs) is still an open issue in space research. The view that all ICMEs would originate as magnetic flux ropes has received increasing attention, although near the orbit of the Earth only about one-third of ICMEs show clear MC signatures and often the MC occupies only a portion of the more extended region showing ICME signatures. In this work we analyze 79 events between 1996 and 2009 reported in existing ICME/MC catalogs (Wind magnetic cloud list and the Richardson and Cane ICME list) using near-Earth observations by ACE (Advanced Composition Explorer) and Wind. We perform a systematic comparison of cases where ICME and MC signatures coincided and where ICME signatures extended significantly beyond the MC boundaries. We find clear differences in the characteristics of these two event types. In particular, the events where ICME signatures continued more than 6 h past the MC rear boundary had 2.7 times larger speed difference between the ICME's leading edge and the preceding solar wind, 1.4 times higher magnetic fields, 2.1 times larger widths and they experienced three times more often strong expansion than the events for which the rear boundaries coincided. The events with significant mismatch in MC and ICME boundary times were also embedded in a faster solar wind and the majority of them were observed close to the solar maximum. Our analysis shows that the sheath, the MC and the regions of ICME-related plasma in front and behind the MC have different magnetic field, plasma and charge state characteristics, thus suggesting that these regions separate already close to the Sun. Our study shows that the geometrical effect (the encounter through the CME leg and/or far from the flux rope center) does not contribute much to the observed mismatch in the MC and ICME boundary times.

scholarly journals Multipoint Interplanetary Coronal Mass Ejections Observed with Solar Orbiter, BepiColombo, Parker Solar Probe, Wind, and STEREO-A

2022 ◽  
Vol 924 (1) ◽  
pp. L6
Author(s):  
Christian Möstl ◽  
Andreas J. Weiss ◽  
Martin A. Reiss ◽  
Tanja Amerstorfer ◽  
Rachel L. Bailey ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Solar Cycle ◽  
Space Weather ◽  
Coronal Mass Ejections ◽  
Data Exploration ◽  
Interplanetary Coronal Mass Ejections ◽  
The Magnetic Field ◽  
Combined Data ◽  
Interplanetary Propagation

Abstract We report the result of the first search for multipoint in situ and imaging observations of interplanetary coronal mass ejections (ICMEs) starting with the first Solar Orbiter (SolO) data in 2020 April–2021 April. A data exploration analysis is performed including visualizations of the magnetic-field and plasma observations made by the five spacecraft SolO, BepiColombo, Parker Solar Probe (PSP), Wind, and STEREO-A, in connection with coronagraph and heliospheric imaging observations from STEREO-A/SECCHI and SOHO/LASCO. We identify ICME events that could be unambiguously followed with the STEREO-A heliospheric imagers during their interplanetary propagation to their impact at the aforementioned spacecraft and look for events where the same ICME is seen in situ by widely separated spacecraft. We highlight two events: (1) a small streamer blowout CME on 2020 June 23 observed with a triple lineup by PSP, BepiColombo and Wind, guided by imaging with STEREO-A, and (2) the first fast CME of solar cycle 25 (≈1600 km s−1) on 2020 November 29 observed in situ by PSP and STEREO-A. These results are useful for modeling the magnetic structure of ICMEs and the interplanetary evolution and global shape of their flux ropes and shocks, and for studying the propagation of solar energetic particles. The combined data from these missions are already turning out to be a treasure trove for space-weather research and are expected to become even more valuable with an increasing number of ICME events expected during the rise and maximum of solar cycle 25.

scholarly journals Do All Interplanetary Coronal Mass Ejections Have a Magnetic Flux Rope Structure Near 1 au?

2020 ◽  
Vol 901 (2) ◽  
pp. L21
Author(s):  
H. Q. Song ◽  
J. Zhang ◽  
X. Cheng ◽  
G. Li ◽  
Q. Hu ◽  
...  
Keyword(s):  
Magnetic Flux ◽  
Coronal Mass Ejections ◽  
Flux Rope ◽  
Interplanetary Coronal Mass Ejections ◽  
Magnetic Flux Rope

scholarly journals Surface Magnetic Field Measurements in Hot Chemically Peculiar Stars

1988 ◽  
Vol 132 ◽  
pp. 313-316
Author(s):  
Pierre. Didelon
Keyword(s):  
Magnetic Field ◽  
Field Measurements ◽  
Surface Magnetic Field ◽  
Surface Field ◽  
Chemically Peculiar ◽  
Peculiar Stars ◽  
Magnetic Field Measurements ◽  
First Results ◽  
Chemically Peculiar Stars ◽  
Good Agreement

The first results of magnetic field measurements are presented here for HD 187474, a slowly rotating Ap star. From resolved Zeeman pattern the strength of the field and its mean inclination were obtained. From differential magnetic broadening a second value of the field strength has been deduced, which is compatible with the previous one. The “Robinson” method has been tested and a good agreement is found between observed and calculated Zeeman broadening of FeII lines. This method can therefore certainly be used to measure the surface field in slow rotating chemically peculiar stars.

scholarly journals Microwave indicator of potential geoeffectiveness and magnetic flux-rope structure of a solar active region

2021 ◽  
Vol 7 (1) ◽  
pp. 3-12
Author(s):  
Anastasiia Kudriavtseva ◽  
Ivan Myshyakov ◽  
Arkadiy Uralov ◽  
Victor Grechnev
Keyword(s):  
Magnetic Field ◽  
Active Region ◽  
Magnetic Flux ◽  
Neutral Line ◽  
Flux Rope ◽  
Coronal Magnetic Field ◽  
Horizontal Magnetic Field ◽  
Magnetic Flux Rope ◽  
Magnetic Flux Ropes ◽  
Class Flare

We analyze the presence of a microwave neutral-line-associated source (NLS) in a super-active region NOAA 12673, which produced a number of geo-effective events in September 2017. To estimate the NLS position, we use data from the Siberian Radioheliograph in a range 4–8 GHz and from the Nobeyama Radioheliograph at 17 GHz. Calculation of the coronal magnetic field in a non-linear force-free approximation has revealed an extended structure consisting of interconnected magnetic flux ropes, located practically along the entire length of the main polarity separation line of the photospheric magnetic field. NLS is projected into the region of the strongest horizontal magnetic field, where the main energy of this structure is concentrated. During each X-class flare, the active region lost magnetic helicity and became a CME source.

Sign in / Sign up

Export Citation Format

Share Document