Reliability of prediction of the magnetosheath Bz component from interplanetary magnetic field observations

0338070 - ÚFA 2010 RIV US eng J - Journal Article
Šafránková, J. - Hayosh, Mykhaylo - Gutynska, O. - Němeček, Z. - Přech, L.
Reliability of prediction of the magnetosheath Bz component from interplanetary magnetic field observations.
Journal of Geophysical Research. Roč. 114, - (2009), A12213/1-A12213/7. ISSN 0148-0227
R&D Projects: GA ČR GA205/09/0170
Grant - others:GA ČR(CZ) GA205/09/0112
Institutional research plan: CEZ:AV0Z30420517
Keywords : IMF * magnetosheath
Subject RIV: BL - Plasma and Gas Discharge Physics
Impact factor: 3.082, year: 2009

In the present statistical study, we discuss a probability of simultaneous observations of the same sign of the magnetic field BZ component in the solar wind and magnetosheath. The analysis is based on 5 min data from four spacecraft (Interball-1, IMP 8, Cluster, and THEMIS) operating in different phases of the solar cycle in themagnetosheath. Their measurements are compared with Wind interplanetary magnetic field (IMF) observations, and other available upstream monitors (ACE, THEMIS B, and OMNI database) are tested for some sets. We can conclude that the probability of observations of the same BZ sign in the solar wind and in the magnetosheath is surprisingly very low from a general point of view. The probability changes through the solar cycle, being larger at the solar minimum. Regardless of the solar cycle phase, this probability is close to 0.5 (random coincidence) for IMF |BZ|<1 nT, and it is a rising function of the BZ value.
Permanent Link: http://hdl.handle.net/11104/0181933