Time Variations in the Fluxes of Suprathermal Ions and Their Relative Abundances at 1 AU during 1998–2017

M. A. Zel’dovich, Yu I. Logachev, K. Kecskeméty

Research output: Contribution to journalArticle

Abstract

Time variations in the fluxes of the suprathermal (0.04–2 MeV/nucleon) ions 3He, 4He, C, O, and Fe are studied together with their relative abundances in the 23rd and 24th solar cycles (SCs) using data from the ULEIS instrument on board the ACE spacecraft. Positive correlations are found between the intensities of these ions detected at 1 AU and parameters of solar activity, indicating that these suprathermal ions originate predominantly in active processes on the Sun. The intensities of all ions at the activity maximum were lower in SC 24 than in SC 23, in both perturbed and quiescent periods of these cycles. In contrast, the time behaviors of the ratios 3He/4He, C/O, and Fe/O were different, and dependent on the primary ionization potential of the ions. The distribution of Fe/O shows higher medium and median values in SC 23, while the distributions of C/O and 3He/4He for SC 23 and SC 24 did not display appreciable differences. The results obtained suggest that the fluxes of Fe ions from the Sun during flares and in the corona were lower in SC 24 than in SC 23 to a greater extent than were the fluxes of 3He, 4He, C, and O ions.

Original languageEnglish
Pages (from-to)508-513
Number of pages6
JournalAstronomy Reports
Volume63
Issue number6
DOIs
Publication statusPublished - Jun 1 2019

Fingerprint

solar cycles
solar cycle
relative abundance
ion
ions
sun
solar activity
ionization potentials
coronas
flares
corona
spacecraft
ionization
cycles

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Time Variations in the Fluxes of Suprathermal Ions and Their Relative Abundances at 1 AU during 1998–2017. / Zel’dovich, M. A.; Logachev, Yu I.; Kecskeméty, K.

In: Astronomy Reports, Vol. 63, No. 6, 01.06.2019, p. 508-513.

Research output: Contribution to journalArticle

@article{f77914a61b244f4d8f5aecf1ff8b5ad6,
title = "Time Variations in the Fluxes of Suprathermal Ions and Their Relative Abundances at 1 AU during 1998–2017",
abstract = "Time variations in the fluxes of the suprathermal (0.04–2 MeV/nucleon) ions 3He, 4He, C, O, and Fe are studied together with their relative abundances in the 23rd and 24th solar cycles (SCs) using data from the ULEIS instrument on board the ACE spacecraft. Positive correlations are found between the intensities of these ions detected at 1 AU and parameters of solar activity, indicating that these suprathermal ions originate predominantly in active processes on the Sun. The intensities of all ions at the activity maximum were lower in SC 24 than in SC 23, in both perturbed and quiescent periods of these cycles. In contrast, the time behaviors of the ratios 3He/4He, C/O, and Fe/O were different, and dependent on the primary ionization potential of the ions. The distribution of Fe/O shows higher medium and median values in SC 23, while the distributions of C/O and 3He/4He for SC 23 and SC 24 did not display appreciable differences. The results obtained suggest that the fluxes of Fe ions from the Sun during flares and in the corona were lower in SC 24 than in SC 23 to a greater extent than were the fluxes of 3He, 4He, C, and O ions.",
author = "Zel’dovich, {M. A.} and Logachev, {Yu I.} and K. Kecskem{\'e}ty",
year = "2019",
month = "6",
day = "1",
doi = "10.1134/S1063772919060076",
language = "English",
volume = "63",
pages = "508--513",
journal = "Astronomy Reports",
issn = "1063-7729",
publisher = "Maik Nauka-Interperiodica Publishing",
number = "6",

}

TY - JOUR

T1 - Time Variations in the Fluxes of Suprathermal Ions and Their Relative Abundances at 1 AU during 1998–2017

AU - Zel’dovich, M. A.

AU - Logachev, Yu I.

AU - Kecskeméty, K.

PY - 2019/6/1

Y1 - 2019/6/1

N2 - Time variations in the fluxes of the suprathermal (0.04–2 MeV/nucleon) ions 3He, 4He, C, O, and Fe are studied together with their relative abundances in the 23rd and 24th solar cycles (SCs) using data from the ULEIS instrument on board the ACE spacecraft. Positive correlations are found between the intensities of these ions detected at 1 AU and parameters of solar activity, indicating that these suprathermal ions originate predominantly in active processes on the Sun. The intensities of all ions at the activity maximum were lower in SC 24 than in SC 23, in both perturbed and quiescent periods of these cycles. In contrast, the time behaviors of the ratios 3He/4He, C/O, and Fe/O were different, and dependent on the primary ionization potential of the ions. The distribution of Fe/O shows higher medium and median values in SC 23, while the distributions of C/O and 3He/4He for SC 23 and SC 24 did not display appreciable differences. The results obtained suggest that the fluxes of Fe ions from the Sun during flares and in the corona were lower in SC 24 than in SC 23 to a greater extent than were the fluxes of 3He, 4He, C, and O ions.

AB - Time variations in the fluxes of the suprathermal (0.04–2 MeV/nucleon) ions 3He, 4He, C, O, and Fe are studied together with their relative abundances in the 23rd and 24th solar cycles (SCs) using data from the ULEIS instrument on board the ACE spacecraft. Positive correlations are found between the intensities of these ions detected at 1 AU and parameters of solar activity, indicating that these suprathermal ions originate predominantly in active processes on the Sun. The intensities of all ions at the activity maximum were lower in SC 24 than in SC 23, in both perturbed and quiescent periods of these cycles. In contrast, the time behaviors of the ratios 3He/4He, C/O, and Fe/O were different, and dependent on the primary ionization potential of the ions. The distribution of Fe/O shows higher medium and median values in SC 23, while the distributions of C/O and 3He/4He for SC 23 and SC 24 did not display appreciable differences. The results obtained suggest that the fluxes of Fe ions from the Sun during flares and in the corona were lower in SC 24 than in SC 23 to a greater extent than were the fluxes of 3He, 4He, C, and O ions.

UR - http://www.scopus.com/inward/record.url?scp=85068158815&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85068158815&partnerID=8YFLogxK

U2 - 10.1134/S1063772919060076

DO - 10.1134/S1063772919060076

M3 - Article

AN - SCOPUS:85068158815

VL - 63

SP - 508

EP - 513

JO - Astronomy Reports

JF - Astronomy Reports

SN - 1063-7729

IS - 6

ER -