Solar Magnetic Field Reversal

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SPACE ENVIRONMENT CENTER. Solar Magnetic Field Reversal. V J Pizzo SHINE Workshop August 18, 2002. SPACE ENVIRONMENT CENTER. Overview. Historical Perspective Sorting through the Issues Challenges and Opportunities. Historical Perspective (1). - PowerPoint PPT Presentation

Transcript of Solar Magnetic Field Reversal

  • Solar Magnetic Field Reversal

    V J Pizzo

    SHINE Workshop

    August 18, 2002

  • Historical Perspective

    Sorting through the Issues

    Challenges and OpportunitiesOverview

  • Observational Basis (Babcock, ApJ, 133, 572, 1961)

    Sunspot cycleButterfly diagram (latitudinal progression)Leader/follower asymmetry and polaritiesBMRs: death by expansionPoleward migration of prominence chainReversal of global solar magnetic field

    Differential rotation[Supergranular motions, meridional flows]Historical Perspective (1)

  • Leighton model (ApJ, 140, 1547, 1964)

    Erupted flux disperses via supergranular random walkDifferential rotation, but no meridional flowSurface dynamics only, smooth diffusive cancellation of expanding BMR fieldsPre-CME & HCSResults:Basics explained: Polar reversal, leader/follower expansion, poleward prominence migrationShortcomings: Heavily idealized, too slow, smooth +/- transitions, de facto dynamo, no coronaHistorical Perspective (2)

  • Wang, Sheeley, & Lean (GRL, 27, 621, 2000; + previous publ.)

    Include systematic meridional flows(e.g., Komm et al., Sol. Phys., 147, 207, 1993)More realistic inputsMain results:Meridional flows speed latitudinal dispersal of fluxEvolution of open flux, relation to total fluxEmerging BMRs can be source of new open fluxEffects of nonuniform distribution of erupted flux

    Historical Perspective (3)

  • Fisk, Schwadron, & Zurbuchen

    Reconcile observations of rigid rotation in corona with surface differential rotation Follow consequences of magnetic fieldline footpoint motion due to differential rotation (long-lived footpoints) Restricted to high-latitude field Produce non-Parker field topology (N/S particle transport)Fisk Mechanism (heliospheric)

  • Account for interaction of differential rotation with HCS & streamers Consider interchange reconnection (driven by differential rotation) in open and closed regions Model for field reversal constancy of open flux rotation of HCS

    Fisk Mechanism (Corona)

  • Account for interaction of differential rotation with streamers Consider interchange reconnection (driven by differential rotation) in open and closed regions Model for field reversal constancy of open flux rotation of HCS

    Fisk Mechanism (Corona)

  • Open flux as the keySuess et al

  • Arge et al., JGR (in press)

  • Fox,McIntosh,& Wilson

  • Richardson et al., GRL, 21, 1559-1560, 1994

  • WSO Classic Source Surface Field

  • WSO Classic Source Surface Field

  • *

  • MWO Photospheric Field

  • Torsional Oscillation Solar weather via helioseismology

    Role of systematic subsurface motions Gulf stream analogy?Sub-surface Driver?

  • Haber et al.

  • Heliospheric identification driven by dynamo (photospheric field)? relation to torsional oscillation? relation to polar field reversal? relation to Fisk mechanism? heliospheric manifestation?1.3 year Coronal Cycle

  • *

  • Why are they there? (Earthquake analogy) Remove flux? (flux catastrophy: how well can we identify detached field in situ?) Remove helicity? Driver or agent of exchange reconnection? Relation to large scale coronal topological evolution Location (streamer belt, switch-backs, delta config.) Frequency (temporal clustering?) Type (complex, fast vs slow, polar crown, etc.) Coronal source of GMIRs?Role of CMEs

  • Timescale and pattern of coronal topological changes Frequency and distribution of CMEs relative to coronal topological changes Open flux hole vs open region STEREO target: location of CMEs surface activity poor indicator of longitude HCS and heliospheric structure during major episode of change Challenges and Opportunities

  • Arge,K Harvey,Hudson,& Kahler

  • Timescale and pattern of coronal topological changes Frequency and distribution of CMEs relative to coronal topological changes Open flux hole vs open region STEREO target: location of CMEs surface activity poor indicator of longitude HCS and heliospheric structure during major episode of change Challenges and Opportunities

    0:50?Good morning. The GOES-12 Solar X-ray Imager will be launched in July. Ive been very fortunate to join this long running program as it gets ready to return data. As you can see, our first hardware work was in the early 80s.My co-author, Vic Pizzo, has worked extensively on analyzing instrument performance, and will give the next talk which compares this instrument to other similar instruments.Dan Wilkinson put together the public archive and user interface to access the terabyte per year we will produceJohn Davis was responsible for the development of the instrument at NASA Marshall.I would like to acknowledge all the people at NOAA, the Air Force, and NASA have contributed their efforts and funds to this program, and I know theyre all looking forward to the launch.This talk will focus not on the instrument or operations details, but on what we can expect to see from the instrument and how the data will be made available to the community.

    0:50?Good morning. The GOES-12 Solar X-ray Imager will be launched in July. Ive been very fortunate to join this long running program as it gets ready to return data. As you can see, our first hardware work was in the early 80s.My co-author, Vic Pizzo, has worked extensively on analyzing instrument performance, and will give the next talk which compares this instrument to other similar instruments.Dan Wilkinson put together the public archive and user interface to access the terabyte per year we will produceJohn Davis was responsible for the development of the instrument at NASA Marshall.I would like to acknowledge all the people at NOAA, the Air Force, and NASA have contributed their efforts and funds to this program, and I know theyre all looking forward to the launch.This talk will focus not on the instrument or operations details, but on what we can expect to see from the instrument and how the data will be made available to the community.

    0:50?Good morning. The GOES-12 Solar X-ray Imager will be launched in July. Ive been very fortunate to join this long running program as it gets ready to return data. As you can see, our first hardware work was in the early 80s.My co-author, Vic Pizzo, has worked extensively on analyzing instrument performance, and will give the next talk which compares this instrument to other similar instruments.Dan Wilkinson put together the public archive and user interface to access the terabyte per year we will produceJohn Davis was responsible for the development of the instrument at NASA Marshall.I would like to acknowledge all the people at NOAA, the Air Force, and NASA have contributed their efforts and funds to this program, and I know theyre all looking forward to the launch.This talk will focus not on the instrument or operations details, but on what we can expect to see from the instrument and how the data will be made available to the community.

    0:50?Good morning. The GOES-12 Solar X-ray Imager will be launched in July. Ive been very fortunate to join this long running program as it gets ready to return data. As you can see, our first hardware work was in the early 80s.My co-author, Vic Pizzo, has worked extensively on analyzing instrument performance, and will give the next talk which compares this instrument to other similar instruments.Dan Wilkinson put together the public archive and user interface to access the terabyte per year we will produceJohn Davis was responsible for the development of the instrument at NASA Marshall.I would like to acknowledge all the people at NOAA, the Air Force, and NASA have contributed their efforts and funds to this program, and I know theyre all looking forward to the launch.This talk will focus not on the instrument or operations details, but on what we can expect to see from the instrument and how the data will be made available to the community.

    0:50?Good morning. The GOES-12 Solar X-ray Imager will be launched in July. Ive been very fortunate to join this long running program as it gets ready to return data. As you can see, our first hardware work was in the early 80s.My co-author, Vic Pizzo, has worked extensively on analyzing instrument performance, and will give the next talk which compares this instrument to other similar instruments.Dan Wilkinson put together the public archive and user interface to access the terabyte per year we will produceJohn Davis was responsible for the development of the instrument at NASA Marshall.I would like to acknowledge all the people at NOAA, the Air Force, and NASA have contributed their efforts and funds to this program, and I know theyre all looking forward to the launch.This talk will focus not on the instrument or operations details, but on what we can expect to see from the instrument and how the data will be made available to the community.

    0:50?Good morning. The GOES-12 Solar X-ray Imager will be launched in July. Ive been very fortunate to join this long running program as it gets ready to return data. As you can see, our first hardware work was in the early 80s.My co-author, Vic Pizzo, has worked extensively on analyzing instrument performance, and will give the next talk which compares this instrument to other similar instruments.Dan Wilkinson put together the public archive and user interface to access the terabyte per year we will produceJohn Davis was responsible for the development of the instrument at NASA Marshall.I would like to acknowledge all the people at NOAA, the Air Force, and NASA have contributed their efforts and funds to this program, and I know theyre all looking forward to the launch.This talk will focus not on th