Anemone Structure and Geo-Effective Flares/CMEs

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Presentation transcript:

Anemone Structure and Geo-Effective Flares/CMEs A. Asai1, T.T. Ishii2, K. Shibata2, N. Gopalswamy3, R. Kataoka4, M. Oka2 1: Nobeyama Solar Radio Observatory, NAOJ 2: Kyoto University 3: NASA/GSFC 4: STE-Lab., Nagoya University CSWM Workshop @Yokohama 2006 November 13 - 17

2005-August-24 Storm 2 M-class flares Flares CMEs Focusing on the features of the sun (photosphere and corona) strong geo-magnetic storm Dst ~ -216 nT

Birth & Evolution of NOAA 10798 movie of SOHO/MDI magnetogram emergence!

Feature of NOAA 10798 Emerged pair violates the Hale’s polarity law! the order of N/S polarity regions with respect to the east-west direction is determined in a given hemisphere S N S N highly twisted magnetic structure lies beneath the photosphere!? generate X17 flare in the next rotation NOAA 10798 N S S N

Soft X-Ray Lightcurve (GOES) emergence 22-Aug 3 M-class flare occurred We focus on the first 2 flares on 2005-Aug-22

Filament Formation southward magnetic field From Ha images, we can identify a filament whose axial field directs south

Anemone of NOAA 10798 NOAA 10798 is a large and complex AR anemone structure CH SOHO/EIT 195A image NOAA 10798 is a large and complex AR 3 M-class flares, CMEs occurred

Anemone Structure sea anemone Shibata et al. (1994) anemone is mainly an active region that appears inside a coronal hole nest of (gigantic) jets (not so active)

2 M-Class Flares flare2 flare1 M5.6 M2.6 Near southwest limb flare1: (S11 W54) flare2: (S12 W60) Both are long duration events (LDEs) Clear arcade structure can be seen Movie of SOHO/EIT (195A)

2 Halo-CMEs Associated with the flares, Halo-type CMEs occurred 08/22 01h (flare1: M2.6) CME1: 1200 km/s 08/22 17h (flare2: M5.6) CME2: 2400 km/s very fast CME! Time interval is ~16hours, but the 2nd CME may catch up the 1st one SOHO/LASCO C3

LASCO/C2 – EIT LASCO/C3 diff CME 1 CME 2

Interplanetary Disturbances 50 n [cm-3] 700 V [km/s] ACE data shock: 8/24 05:30UT very complex structure strong southward magnetic field: –50 nT merging of 2 CMEs 50 |B| [nT] Bx [nT] By [nT] Bz [nT] –50 Dst

Event Summary 2 LDE flares occurred on 2005 August 22 NOAA 10798 was close to the west limb (~W60) Halo-type CMEs occur regardless of the near-limb position 1st CME : 1200 km/s, 2nd CME : 2400 km/s CME speeds were extremely fast Strong southward magnetic field region Ha filament whose axial field directs southward was formed

Anemone Structure and Flares/CMEs For a small AR, CH works to collimate the ejections In the case of NOAA 10798, a small CH and quite a big AR… + Low density above the AR + Guided by open field line Easy for ejections to expand Halo CMEs High speed CMEs Geo-effective CMEs AR: active region CH: coronal hole

Summary NOAA 10798 big magnetic storm (2005 August 24) has a potentially complex structure (violating the Hale’s polarity law) emerged in a small coronal hole  anemone structure formed filaments, whose the axial field is southward generated 3 M-class flares (2005 August 22–23), followed by Halo-type CMEs CMEs are very fast, and are widely spread strong southward magnetic field (2 CMEs) big magnetic storm (2005 August 24)