Examine solar cycle variations (11/22 yrs.) of DA in SO & SI times.

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Presentation transcript:

Examine solar cycle variations (11/22 yrs.) of DA in SO & SI times. 32nd ICRC (August 15, 2011, Beijing) SH3.3 ID368 Solar cycle dependence of the diurnal anisotropy of 0.6 TeV cosmic ray intensity observed with the Matsushiro underground muon detector K. Munakata1, C. Kato1, S. Yasue1, S. Mori1, M. Takita2, and J. Kota3 1Shinshu Univ., 2ICRR, 3Univ. of Arizona Introduction. Observation with Matsushiro (E-W) over 24 years in 1985-2008 @0.596 TeV. Examine solar cycle variations (11/22 yrs.) of DA in SO & SI times. Discussions. (Munakata et al., ApJ, 712, 1100, 2010)

(Planetary and Space Sci., 13, 1965) W. I. Axford (Planetary and Space Sci., 13, 1965) SI (Extragalactic) SO SI (Galactic)

Diurnal anisotropy & harmonic dial Obs. Obs. - CG Active period Quiet period 00:00 06:00 12:00 18:00 1st harmonic dial phase amplitude Compton-Getting

Solar cycle dependence of (by Matsushiro UG- detector in 1985-2008) 0.6 TeV GCR anisotropy (by Matsushiro UG- detector in 1985-2008) ● SI: sidereal ■ SO: solar △ ASI: anti-sidereal SI (366 c/y) Tibet AS (1999-2008) 0 h 18 h 6 h ASI (364 c/y) CG effect （solar min.） SO (365 c/y)

(400 km/s solar wind travels ~180 AU) activity ~15:00 LT SO (CG subtracted) max＝＋0.74 tCR=+26 months (400 km/s solar wind travels ~180 AU) SI

SO SI max＝＋0.57 tCR=+14 months Solar activity ~03:00 LT (CG subtracted) SI ~03:00 LT

The observed SI daily variation Similar to the SI daily variation of multi-TeV GCR except ~1/3 attenuation of amplitude

SI Steady increase of amplitude? No correlation with the solar activity seen by Matsushiro (3) SI (Abdo et al., 2009)

Small solar cycle variation (if any) only ~1/6 amplitude changing with the solar cycle ~1/3 attenuation by the solar modulation

MHD model heliosphere (Washimi & Tanaka) By z x P N P N 100 200 300 AU Positive Negative

Summary Additional SO anisotropy (+ CG anisotropy). Amplitude shows a positive correlation with the solar activity (max＝＋0.74) Significant time lag (tCR =+26 months) The average SI amplitude @0.6 TeV is ~1/3 of the amplitude in multi-TeV region. Steady increase of SI amplitude by Milagro is NOT caused by the decreasing solar activity. Only ~1/4 of the SI attenuation varies in a weak correlation with the solar activity cycle.