Long-term evolution of magnetic fields on the Sun Alexei A. Pevtsov US National Solar Observatory.

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Presentation transcript:

Long-term evolution of magnetic fields on the Sun Alexei A. Pevtsov US National Solar Observatory

What is Space Climate Anyway? SW–SC Similarities Same drivers (solar eruptive events, open magnetic fields/CHs, solar wind) Similar spatial scales (quiet Sun, large-scale magnetic fields). Both changes in each system and interaction of systems play role SW – SC differences Different time scales (what scales? Do space “seasons”/ regular cyclic variations are “climate”? ) Random component plays more important role in SC vs. SW (less predictable); external drivers do play role.

What is Space Climate Anyway? Space Climate (SC) is the description of the long-term pattern of Space Weather (SW) in a particular place in heliosphere. How long is “long-term”? SC change refers to periods over multiple solar cycles. SC variability is represented by periodic or intermittent changes related SW (cycle).

Where on the Sun the SW/SC originates from? ARs CHs QS Cheung et al. 2014

Is it all about Active Regions? Total magnetic flux in QS is about 10x of flux in ARs (Harvey 1992, Sanchez Almeida 2003, 2009). QS flux does not change with solar cycle (Harvey 1992, Pevtsov & Acton 2001). (Some) CHs are related to ARs magnetic fields Karachik et al (2010)

Does Magnetic Field of Sunspots is weakening? Penn and Livingston (2011) PDF retains shape, mean shifting 46 G yr -1

Sunspot Field Strength and 10.7 cm Radio Flux Livingston, Penn, Svalgaard (2012) PDF retains shape, mean shifts 46 Gyr -1 Ratio of spots field strength to 10.7 cm flux anomaly consistent with decreasing sunspot field strength 1947 – 1997 (blue), 1998 – 2014 (red)

Cycle Variation in Sunspot Field Strengths Rezaei, Beck, & W. Schmidt (2012) Penn & Livingston (2006): 1.9% /yr increase Mathew et al (2007) – (MDI, 160 spots ) slight decrease in umbral intensity Schad & Penn (2010) – (>10000 umbra, KPVT/ SPMG) no significant variation with cycle both intensity and field. Watson et al. (2011; 2014)

MWO SOLIS 23 Oct 2014 Historical Records of Sunspot Field Strengths US Mount Wilson Observatory (MWO), (dig. In progress) SU Sun Service, , CrAO, 2012-present (digitized)

pit flood New grading Beware of Systematics in Historical Data. Tlatov et al (2014)

CrAO (blue) and Pulkovo (red) All measurements Daily largest sunspot Pevtsov et al (2011) Change in Instrumentation, Observer’s Bias etc

Long-term trends may appear due to inclusion of smaller/weaker field features Strong fields show only variations with solar cycle, and no secular trend Penn & Livingston (2006): decline in field strengths –52 G/year Watson et al (2011) –70 G/year G/yr (C19), (C20), (C21), (C22), G/yr (C23) MWO FSU Data

Nagovitsyn et al (2012) Mean of two contributions Penn & Livingston (2011) Large sunspots contribution

Nagovitsyn et al (2014, in preparation) Magnetic field: CrAO, Sunspot area: Kislovodsk/Pulkovo Observatory

Area – magnetic field relation Munoz- Jaramillo et al (2014) Ringnes & Jensen (1960) SDO/HMI SOHO/MDI

Group areas Sunspot areas

Munoz- Jaramillo et al (2014)

(Weibull) – “fragmentation” (log-normal) – “growth and aggregation” Munoz- Jaramillo et al (2014)

Transition between relative contribution of Weibull and log-normal is about the same as in Tlatov & Pevtsov (2014, small-large sunspots) and may indicate that sunspots in two categories arise from two different generation mechanisms: one directly connected to the global component of the dynamo (and the generation of bipolar active regions), and the other with the small-scale component of the dynamo (and the fragmentation of magnetic structures due to their interaction with turbulent convection).

All sunspots RGO and SOON

Pevtsov et al (2014) Solar cycle variations with amplitude about 1000 G Magnetic field proxy shows variations with solar cycle Much weaker secular trend (300 G increase-decrease) with a broad maximum in 1950 th – Gleissberg Cycle? Daily largest sunspots RGO and SOON

Open Magnetic Flux Vieira & Solanki (2010) Lockwood et al. (2009) – reconstructed from geomagnetic aa-index

Sunspot area-field strength: 2D PDFs Nagovitsyn et al (2014, in preparation)

11-50 MSH MSH >1000 MSH MWO field strength 700 G

How about Real Space Climate Time Scales? Concentration of cosmogenic isotopes ( 14 C and 10 Be) in terrestrial archives can be used to derive proxy for solar activity over last 11,000+ years (e.g., Usoskin et al 2007). Relies on models of long-term changes in radioisotope production; known changes of geomagnetic field. Derived proxy only represents open flux in heliosphere. Grand minima (Gm) appear to be a stochastic process. There is a tendency for Grand minima to “cluster” in groups or produce long Gm-free periods.

Concluding Remarks Modern sunspot field strength do not exhibit a strong decline in sunspot field strengths. Sunspot field strength vary with solar cycle (solar min/max – weaker/stronger sunspots). Long-term (100-years) trends are present, but the amplitude is much smaller than cycle variations. Both cycle and long-term variations may be related to changes in sunspot size distribution. Analysis of cosmogenic isotopes indicates the presence of long term variations in open magnetic field on the Sun. Appearance of Gm is a stochastic process.