Characteristics of Mode Parameters in Characteristics of Mode Parameters in the Source Regions of CMEs: A First the Source Regions of CMEs: A First

LookLook

Sushanta C. Sushanta C. Tripathy Tripathy

National Solar National Solar Observatory Observatory

OutlineOutline

• Identification of CME source locations Identification of CME source locations

•Case study of 2 individual CMEsCase study of 2 individual CMEs

• Summary and plan for future Summary and plan for future

ProcedureProcedure• CMEs are selected from the catalogue of Zhou et al. (2006) who CMEs are selected from the catalogue of Zhou et al. (2006) who

have studied a total of 288 halo CMEs during 1997-2003 and have have studied a total of 288 halo CMEs during 1997-2003 and have identified their source locations by associating the events with identified their source locations by associating the events with surface activity.surface activity.

• CMEs are associated with extended bipolar regions, trans-CMEs are associated with extended bipolar regions, trans-equatorial magnetic loops, trans-equatorial filaments and equatorial magnetic loops, trans-equatorial filaments and long filaments.long filaments.

• We use the standard ring-diagram procedure and analyze an area We use the standard ring-diagram procedure and analyze an area of 15x15 degrees in heliographic longitude and latitude covering of 15x15 degrees in heliographic longitude and latitude covering 128x128 pixels giving a resolution of 0.03232 Mm128x128 pixels giving a resolution of 0.03232 Mm–1–1 or 22.497 R or 22.497 RΘΘ

–1–1..

• Each region is tracked for 1664 minutes Each region is tracked for 1664 minutes

• We have analyzed 44 events using the GONG+ data during 2001-We have analyzed 44 events using the GONG+ data during 2001-2003 within 302003 within 30ºº of the central meridian to avoid fore-shortening of the central meridian to avoid fore-shortening effect. effect.

• The mode parameters of CME regions are compared The mode parameters of CME regions are compared with those of quiet region at the same latitude and in with those of quiet region at the same latitude and in the same Carrington rotation to avoid errors arising the same Carrington rotation to avoid errors arising from the systematic effects and foreshortening.from the systematic effects and foreshortening.

• Compare mode Frequency, amplitude, width and total Compare mode Frequency, amplitude, width and total powerpower

CME associated with AR NOAA 10225CME associated with AR NOAA 10225 • CME associated with AR CME associated with AR

located at N22W12 (CR 1997, located at N22W12 (CR 1997, CR Long: 113CR Long: 113ºº) on 021219) on 021219

• First seen in C2 data at First seen in C2 data at 22:06:00 22:06:00

• Magnetic activity Index (MAI): Magnetic activity Index (MAI): 97.6 Gauss97.6 Gauss

• No Flare observed No Flare observed

• Quiet region at same position Quiet region at same position on 021212 (CR Long 204) and on 021212 (CR Long 204) and MAI 2.7 GaussMAI 2.7 Gauss

CME source location: N22W12

Active Region NOAA 9628Active Region NOAA 9628

• Location: S22.5 E15 (CR Long: 292.5) Location: S22.5 E15 (CR Long: 292.5) on 23 March 2001 on 23 March 2001

•MAI 146.3 GaussMAI 146.3 Gauss

•Compared with a quiet region at same Compared with a quiet region at same latitude and at 0latitude and at 0ºº longitude on 16 longitude on 16 March 2001 with a March 2001 with a MAI of 0.08 Gauss MAI of 0.08 Gauss (CR Long: 45(CR Long: 45º)º)

Comparison of 2 quiet regionsComparison of 2 quiet regions

Relative frequency differences

Active Region

fP1P2p3

CME region

Av. error in each point

3.5 mHz ~ 10-4 μHz4.5 mHz ~ 10-3 μHz

Ratio of the peak power

fP1P2p3

CME region

Active Region

Av. error in each point

3.5 mHz ~ 0.05 4.5 mHz ~ 0.12

From Rajaguru, Basu, & Antia (2001)

Relative difference in half-width

CME region

Active Region

fP1P2p3

Av. error in each point

3.5 mHz ~ 0.074.5 mHz ~ 0.13

Relative difference in total power

CME region

Active Region

CME associated with a FilamentCME associated with a Filament

• CME associated with CME associated with filament located at filament located at S25W18 (CR 1986, CR S25W18 (CR 1986, CR Long:231Long:231ºº) )

• First seen in C2 data First seen in C2 data on 020214 at 02:30 on 020214 at 02:30

• MAI: 11.3 GaussMAI: 11.3 Gauss

• Quiet region at CR Quiet region at CR Long 169Long 169ºº (020217), (020217), MAI 3.7MAI 3.7

Relative frequency differences

Active Region

CME regionfP1P2p3

Ratio of the amplitudes A / A (Quiet)

Active Region

CME region

fP1P2p3

Relative differences in half-width

Active Region

CME region

fP1P2p3

Ratio of the mode areaA*Γ / A*Γ (Quiet)

Active Region

CME region

fP1P2p3

Temporal Temporal evolutionevolution of line-width of line-width in AR and CME regions in AR and CME regions

CME1: N22 w12

CME2: S25w18

f-modes: 2550 to 2750 μ Hz

p-modes 3000-3500 μ Hz

SummarySummary

• The widths of the peaks is a function of the The widths of the peaks is a function of the frequency and the radial order ‘frequency and the radial order ‘nn’. For most CMEs, ’. For most CMEs, the widths are smaller implying longer life times. the widths are smaller implying longer life times.

• The The ff- and - and pp-mode frequencies of high degree -mode frequencies of high degree modes are significantly larger compared to quiet modes are significantly larger compared to quiet regions if the CME is in active region. regions if the CME is in active region.

• The power in both The power in both ff- and - and pp-modes is lower in CME -modes is lower in CME regions regions

• The increase in mode frequency is monotonic in The increase in mode frequency is monotonic in frequency while all other properties show more frequency while all other properties show more complex frequency dependence. complex frequency dependence.

Areas for Further StudyAreas for Further Study

• Look at ring diagrams produced over shorter Look at ring diagrams produced over shorter time spans and/or smaller patches to isolate time spans and/or smaller patches to isolate more transient features.more transient features.

• Look at magnetograms to see how MAI Look at magnetograms to see how MAI changes day-to-day to see if this explains changes day-to-day to see if this explains daily variationsdaily variations

• Look at flow maps and other fluid descriptors.Look at flow maps and other fluid descriptors.

• MORE STATISTICSMORE STATISTICS