Magnetic Cloud Net Cumulative Helicity During Solar Cycle 23

Details Magnetic Cloud Net Cumulative Helicity During Solar Cycle 23 Magnetic Cloud Net Cumulative Helicity During Solar Cycle 23

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...204.3803l&link_type=abstract

American Astronomical Society Meeting 204, #38.03; Bulletin of the American Astronomical Society, Vol. 36, p.712

Astronomy and Astrophysics

Astronomy

Scientific paper

Nine years of magnetic clouds (MCs) from the WIND and ACE spacecraft (1995-2003) are analyzed using the static, linear, force-free cylinder model. The net cumulative helicity is defined as the difference between the running totals of right- and left-handed MC helicities calculated from the model. This net helicity is a time-dependent quantity that appears to be approximately sinusoidal with a solar cycle like period. There is a right-handed bias in the helicity carried by MCs during solar minimum, and much stronger left-handed bias in the helicity transported during the rising phase and solar maximum, even though there are not drastic differences in the overall number of right- and left-handed clouds. The Bastille Day 2000 MC event is the largest contributor to this left-handed transition.
Monte Carlo simulations of random magnetic cloud sequences from the observed helicity distribution show that the magnitude of the observed left-handed net helicity bias during solar maximum is only expected 2-4 % of the time if right- and left-handed events are equally likely. Possible sources of CME helicity are discussed.
This work is supported by NASA, ONR, and NSF. BJL is supported by a NASA GSRP fellowship NGT5-50453.

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