Determination of the Ar/Ca solar wind elemental abundance ratio using SOHO/CELIAS/MTOF

2001 ◽  
Author(s):  
J. M. Weygand
Keyword(s):  
Solar Wind ◽  
Abundance Ratio ◽  
Elemental Abundance

Determination of the 36 Ar/ 38 Ar isotopic abundance ratio of the solar wind using SOHO/CELIAS/MTOF

2001 ◽  
Vol 65 (24) ◽  
pp. 4589-4596 ◽  
Author(s):  
James M. Weygand ◽  
Fred M. Ipavich ◽  
Peter Wurz ◽  
John A. Paquette ◽  
Peter Bochsler
Keyword(s):  
Solar Wind ◽  
Abundance Ratio ◽  
Isotopic Abundance

scholarly journals The Fe/O elemental abundance ratio in the solar wind as observed with SOHO CELIAS CTOF

1999 ◽  
Vol 104 (A11) ◽  
pp. 24769-24780 ◽  
Author(s):  
M. R. Aellig ◽  
S. Hefti ◽  
H. Grünwaldt ◽  
P. Bochsler ◽  
P. Wurz ◽  
...  
Keyword(s):  
Solar Wind ◽  
Abundance Ratio ◽  
Elemental Abundance

scholarly journals Signature and escape of highly fractionated plasma in an active region

2021 ◽  
Vol 508 (2) ◽  
pp. 1831-1841
Author(s):  
David H Brooks ◽  
Stephanie L Yardley
Keyword(s):  
Magnetic Field ◽  
Solar Wind ◽  
Active Region ◽  
Active Regions ◽  
Abundance Ratio ◽  
Elemental Abundance ◽  
Composition Analysis ◽  
Closed Field ◽  
Coronal Loops ◽  
Magnetic Field Model

ABSTRACT Accurate forecasting of space weather requires knowledge of the source regions where solar energetic particles (SEP) and eruptive events originate. Recent work has linked several major SEP events in 2014, January, to specific features in the host active region (AR 11944). In particular, plasma composition measurements in and around the footpoints of hot, coronal loops in the core of the active region were able to explain the values later measured in situ by the Wind spacecraft. Due to important differences in elemental composition between SEPs and the solar wind, the magnitude of the Si/S elemental abundance ratio emerged as a key diagnostic of SEP seed population and solar wind source locations. We seek to understand if the results are typical of other active regions, even if they are not solar wind sources or SEP productive. In this paper, we use a novel composition analysis technique, together with an evolutionary magnetic field model, in a new approach to investigate a typical solar active region (AR 11150), and identify the locations of highly fractionated (high Si/S abundance ratio) plasma. Material confined near the footpoints of coronal loops, as in AR 11944, that in this case have expanded to the AR periphery, show the signature, and can be released from magnetic field opened by reconnection at the AR boundary. Since the fundamental characteristics of closed field loops being opened at the AR boundary is typical of active regions, this process is likely to be general.

The Fe/O elemental abundance ratio in the solar wind

1999 ◽  
Author(s):  
M. R. Aellig ◽  
H. Holweger ◽  
P. Bochsler ◽  
P. Wurz ◽  
H. Grünwaldt ◽  
...  
Keyword(s):  
Solar Wind ◽  
Abundance Ratio ◽  
Elemental Abundance

Determination of the eddy turn-over time in the solar wind

2007 ◽  
Author(s):  
K. Bamert ◽  
R. Kallenbach ◽  
M. Hilchenbach ◽  
C. W. Smith
Keyword(s):  
Solar Wind ◽  
Turn Over ◽  
Over Time

scholarly journals Determination of Scandium in mafic and ultramafic rocks of ophiolites from Luk Ulo Complex, Karangsambung, Central Java, Indonesia

2020 ◽  
Vol 200 ◽  
pp. 06003
Author(s):  
Nugroho Imam Setiawan ◽  
Kardo Polarman Rajoki Silitonga ◽  
Fahmi Adiyatma Makkaratte ◽  
Chusni Ansori
Keyword(s):  
Mineral Composition ◽  
General Trend ◽  
Elemental Abundance ◽  
Ultramafic Rocks ◽  
Mining Activities ◽  
Central Java ◽  
Parent Rocks ◽  
Modern Industry

Scandium (Sc) is important element for its utilization in modern industry. Initial Sc content in the parent rocks primary importance controlling the Sc concentrations in its weathered derivatives. This contribution examines the Sc concentrations in parent rocks of mafic and ultramafic rocks related to the ophiolite series in Luk Ulo Complex, Karangsambung, Central Java, Indonesia. The ophiolite series in this area are basalt, microgabbronorite, gabbronorite, websterite, and serpentinite from 5 locations of Medana, Lokidang, Parakansubah, Selogiri, and Pucangan areas. The general trend from the distribution of Sc in the ophiolite sequence of Medana and Parakansubah-Lokidang Rivers suggests the Sc contents increase from shallow to deeper levels of the sequence. The lowest concentrations of Sc in the ophiolite sequence of Medana and Parakansubah-Lokidang Rivers are in basalt, which are 24–29 ppm. In the middle sequence, the Sc concentrations are 27–34 ppm and 24–43 ppm, respectively in microgabbronorite and gabbronorite. The highest Sc concentrations are in websterite, which are 51–54 ppm, as the deepest sequence of the ophiolite in this area. Meanwhile, Sc contents in serpentinite from Selogiri and Pucangan areas are 5–11 ppm, which are considered the lowest Sc contents. It suggests that the pre-serpentinization mineral composition rather than the process of serpentinization determine the elemental abundance of Sc in serpentinite. The results are used to be an analog for Sc identification in the ophiolite belts in central Indonesia. This also considering that Luk Ulo Complex been established as National Geopark of Karangsambung-Karangbolong, so that mining activities are prohibited in this area.

Genesis On-board Determination of the Solar Wind Flow Regime

2003 ◽  
pp. 153-171 ◽  
Author(s):  
M. Neugebauer ◽  
J. T. Steinberg ◽  
R. L. Tokar ◽  
B. L. Barraclough ◽  
E. E. Dors ◽  
...  
Keyword(s):  
Solar Wind ◽  
Flow Regime ◽  
Wind Flow ◽  
Solar Wind Flow

A New Determination of the C^{12}/C^{13} Isotopic Abundance Ratio in the Solar Photosphere

1967 ◽  
Vol 147 ◽  
pp. 697 ◽  
Author(s):  
Luise Herzberg ◽  
L. Delbouille ◽  
G. Roland
Keyword(s):  
Abundance Ratio ◽  
Solar Photosphere ◽  
Isotopic Abundance
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