scholarly journals Solar Wind Helium Abundance Heralds Solar Cycle Onset

Solar Physics ◽  
2021 ◽  
Vol 296 (4) ◽  
Author(s):  
Benjamin L. Alterman ◽  
Justin C. Kasper ◽  
Robert J. Leamon ◽  
Scott W. McIntosh
Keyword(s):  
Solar Wind ◽  
Solar Cycle ◽  
Helium Abundance

scholarly journals Solar Wind Helium Abundance Heralds Solar Cycle Onset

2021 ◽  
Author(s):  
Benjamin L Alterman ◽  
Justin C Kasper ◽  
Robert J Leamon ◽  
Scott W McIntosh
Keyword(s):  
Solar Wind ◽  
Solar Cycle ◽  
Sunspot Number ◽  
Cycle Length ◽  
Phase Lag ◽  
Helium Abundance ◽  
Solar Cycles ◽  
Wind Speeds ◽  
Solar Wind Acceleration ◽  
Solar Cycle Length

Abstract We study the solar wind helium-to-hydrogen abundance's ( A He ) relationship to solar cycle onset. Using OMNI/Lo data, we show that A He increases prior to sunspot number (SSN) minima. We also identify a rapid depletion and recovery in A He that occurs directly prior to cycle onset. This A He Shutoff happens at approximately the same time across solar wind speeds ( v sw ) and the time between successive A He shutoffs is typically on the order of the corresponding solar cycle length. In contrast to A He 's v sw -dependent phase lag with respect to SSN (Alterman and Kasper, 2019), A He Shutoff's concurrence across v sw likely implies it is independent of solar wind acceleration and driven by a mechanism near or below the photosphere. Using Brightpoint (BP) measurements to provide context, we infer that this shutoff is likely related to the overlap of adjacent solar cycles and the equatorial flux cancelation of the older, extended solar cycle during solar minima.

EVOLUTION OF THE RELATIONSHIPS BETWEEN HELIUM ABUNDANCE, MINOR ION CHARGE STATE, AND SOLAR WIND SPEED OVER THE SOLAR CYCLE

2012 ◽  
Vol 745 (2) ◽  
pp. 162 ◽  
Author(s):  
J. C. Kasper ◽  
M. L. Stevens ◽  
K. E. Korreck ◽  
B. A. Maruca ◽  
K. K. Kiefer ◽  
...  
Keyword(s):  
Solar Wind ◽  
Solar Cycle ◽  
Wind Speed ◽  
Charge State ◽  
Solar Wind Speed ◽  
Helium Abundance

scholarly journals Solar Wind Helium Abundance as a Function of Speed and Heliographic Latitude: Variation through a Solar Cycle

2007 ◽  
Vol 660 (1) ◽  
pp. 901-910 ◽  
Author(s):  
Justin C. Kasper ◽  
Michael L. Stevens ◽  
Alan J. Lazarus ◽  
John T. Steinberg ◽  
Keith. W. Ogilvie
Keyword(s):  
Solar Wind ◽  
Solar Cycle ◽  
Helium Abundance ◽  
Heliographic Latitude ◽  
Latitude Variation

The solar wind helium abundance: Variation with wind speed and the solar cycle

2001 ◽  
Vol 28 (14) ◽  
pp. 2767-2770 ◽  
Author(s):  
Matthias R. Aellig ◽  
Alan J. Lazarus ◽  
John T. Steinberg
Keyword(s):  
Solar Wind ◽  
Solar Cycle ◽  
Wind Speed ◽  
Helium Abundance ◽  
Abundance Variation

Ulysses solar wind plasma observations during the declining phase of solar cycle 22

1995 ◽  
Vol 16 (9) ◽  
pp. 85-94 ◽  
Author(s):  
J.L. Phillips ◽  
S.J. Bame ◽  
W.C. Feldman ◽  
J.T. Gosling ◽  
C.M. Hammond ◽  
...  
Keyword(s):  
Solar Wind ◽  
Solar Cycle ◽  
Solar Wind Plasma

scholarly journals Mars Under Primordial Solar Wind Conditions: Mars Express Observations of the Strongest CME Detected at Mars Under Solar Cycle #24 and its Impact on Atmospheric Ion Escape

2017 ◽  
Vol 44 (21) ◽  
Author(s):  
Robin Ramstad ◽  
Stas Barabash ◽  
Yoshifumi Futaana ◽  
Masatoshi Yamauchi ◽  
Hans Nilsson ◽  
...  
Keyword(s):  
Solar Wind ◽  
Solar Cycle ◽  
Mars Express ◽  
Ion Escape ◽  
Solar Cycle 24 ◽  
Cycle 24

scholarly journals Probability density functions for the variable solar wind near the solar cycle minimum

2015 ◽  
Vol 120 (8) ◽  
pp. 6152-6166 ◽  
Author(s):  
Z. Vörös ◽  
M. Leitner ◽  
Y. Narita ◽  
G. Consolini ◽  
P. Kovács ◽  
...  
Keyword(s):  
Solar Wind ◽  
Solar Cycle ◽  
Probability Density ◽  
Probability Density Functions ◽  
Density Functions ◽  
Cycle Minimum
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