1 ~130 Years of Solar Wind Data: The Floor and More E.W. Cliver Space Vehicles Directorate Air Force Research Laboratory AGU 27-30 May 2008.

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Presentation transcript:

1 ~130 Years of Solar Wind Data: The Floor and More E.W. Cliver Space Vehicles Directorate Air Force Research Laboratory AGU May 2008

2 Outline - Long-term solar wind reconstruction: Emerging consensus - Floor in the IMF: Then & Now - Secular variation of solar wind speed - Entering a Gleissberg Minimum?

3 Long-term Solar Wind Magnetic Field Reconstruction: Emerging Consensus

4 The IDV index has the useful property of being highly correlated with B and independent of V (Svalgaard & Cliver, JGR, 110(12), 2005)

Long-term Solar Wind Magnetic Field Reconstruction: Emerging Consensus (Exception: McCracken, 2007)

6 - Annual averages of B show evidence for a floor ~ 4.5 nT - The sharp drop from in the McCracken time series does not appear in geomagnetic data - The low value in 1901 from RL&F is in error (APR, priv. comm.) Floor

7 Floor in the Solar Wind Magnetic Field: Direct Observations (27-Day Averages) MM MM M

8 Floor in the Solar Wind Magnetic Field: Recent Direct Observations ~4.4 nT

9 Floor in the Solar Wind Magnetic Field: Cosmogenic Nuclei / long-term (Muscheler et al., 2005) (Caballero-Lopez et al., 2004)

10 M 115 μT B (nT) SSW + HSS + CME º SSW + HSS * SSW M ~250 μT M 245 μT M 200 μT Interpretation of Floor: Baseline Open Magnetic Flux Year (Fisk et al., 1999; Owens & Crooker, 2006)

11 For SSN = 0 Then: B Total (ecliptic) = 4.6 nT; B RADIAL (all latitudes) = 3.0 nT Now: B Total (ecliptic) ~ 4 nT; B RADIAL (all latitudes) ~ 2 nT Svalgaard & Cliver, ApJ Lett. 661, L203, 2007 B(nT) = 0.27R ½ + 4.6

12 ~15% increase in solar wind speed during the last ~120 years (Rouillard et al., 2007; Svalgaard & Cliver, 2007) Floor

13 Plea for Help to Magnetospheric Physicists Open Question: Effect of ~10% decrease of Earth’s dipole since ~1850 on geomagnetic activity? - Siscoe et al. (2002)  Decrease in activity (ISM model & Hill M/I coupling models) - Glassmeier et al. (2004)  Weak/no effect (scaling relationships between magnetospheric parameters & M)

14 A Coming Gleissberg Minimum? Cycle 24 may be smallest in ~100 years Test of Long-term Reconstructions, Precursor Prediction Technique, Dynamo Models, … (Svalgaard, Cliver, & Kamide, 2005) ?

15 Conclusions - Consensus long-term B & V / Validation of IDV - Floor in IMF in ecliptic Btot ~4 nT & Br ~ 2 nT (SSN = 0) - ~15% increase in solar wind V since 1872?