Polar Coronal Hole - NASA

Polar Coronal Hole - NASA

Polar Coronal Hole Variations Over Solar Cycle 23 Nishu Karna Mentor: Dr. William Dean Pesnell Code: 671 SESI Program-2010 Goddard Space Flight Center Date: August 4, 2010

Coronal Hole : Large dark regions in the Suns corona that are cooler and have lower density plasma than average. First observed in X-ray in 1974. Well seen via UV and X-ray

telescopes flown above the Earth's atmosphere. Open magnetic field lines. Source of high speed solar wind. May predict the magnitude of upcoming solar maximum. Polar coverage during low solar

activity - Polar Coronal Hole Solar and Heliospheric Observation (SOHO) International collaboration between ESA and NASA Launched in December 2, 1995 by Atlas Centaur Rocket

Orbits around the Sun-Earth First Lagrangian Point (L1) Twelve instruments on board Used Extreme UV Imaging Telescope (EIT) My Work Used Elena Benevolenskayas online SOHO/EIT synoptic map

archive. My Work Find area of Polar Coronal holes from Carrington Rotation (CR) 1911 to CR 2055 (June 28, 1996 to March 31, 2007). (a)

(b) (a) Northern polar coronal hole area and (b) Southern polar coronal hole area with respect to Calendar date from June,28 1996 to March 31, 2007 (CR 1911-CR 2055) for the 195 ,171 and 304 wavelengths.

Solar B Angle: The latitude position of the center of the solar disk which varies according to change in the tilt of the solar axis relative to the Earth. Earths orbit Line of Equinoxes

Suns Axis Variation of the polar coronal hole (Northern, red solid line; Southern, blue solid line) in the 195 wavelength. Result:

The estimated fractional areas for the Northern hole the area was 5.0% in 1996 and 4.5% in 2007. For the Southern hole was 4.5% in 1996 and 4.0% in 2007. Drawback: The latitude only ranges between 83. Missing latitude contributes ~0.75% of the Sun's area at each pole.

Distorted image when a 3D sphere is projected into 2D image. Future Work: Work with Magnetograms to better determine coronal hole area.

Recently Viewed Presentations

  • 3.14/3.40J/22.71J Recap Diffusion Process & Surface Evolution Ting-Yun

    3.14/3.40J/22.71J Recap Diffusion Process & Surface Evolution Ting-Yun

    Vacancy mechanism/Interstitial mechanism Ting-Yun Huang, 2012/11/15. Page . Diffusion is a thermally activated process, follow the basic forms. Di usually has a prefactor which depends on the crystal structure and the diffusion path of the materials. Vacancy mechanism:Usually of low...
  • Internet Backplane Protocol API and Applications

    Internet Backplane Protocol API and Applications

    Logistical Optimization of Distributed Applications Principle Investigators Micah Beck James S. Plank Jack Dongarra Rich Wolksi (UCSB) Research Staff Alex Bassi Terry Moore Graziano Obertelli (UCSB) Funding DoE SciDAC High Performance Network NSF Next Generation Software Graduate Students Scott ...
  • Chapter 5

    Chapter 5

    Arial Wingdings Larson, Calculus an Applied Approach 1_Larson, Calculus an Applied Approach Chapter 5 Definition of Antiderivative Integral Notation of Antiderivatives Basic Integration Rules Figure 5.1 General Power Rule for Integration Integrals of Exponential Functions Integrals of Logarithmic Functions Figure...
  • Care provision fit for a future climate funded by: Joseph ...

    Care provision fit for a future climate funded by: Joseph ...

    Centralised heating and hot water systems can lead to unwanted heat gains due to pipework. Lack of investment in features that would enable better heat management, particularly with regard to ventilation and solar shading. Care provision. fit for a future...
  • PLANNING FOR CONVERGED INFRASTRUCTURE Performance, Capacity and Management

    PLANNING FOR CONVERGED INFRASTRUCTURE Performance, Capacity and Management

    Definition - Converged Infrastructure. Grouping of multiple components: server (compute), storage, networking and management software in a single, optimized computing package
  • Integrating MI and CBT

    Integrating MI and CBT

    Combination approaches MI as a prelude to CBT (Arkowitz et al 2008) Switching to MI during CBT to explore specific issues around ambivalence Integrative approaches Seamless joining together of CBT and MI "assimilative integration"an 'Integrative Framework' Training issues Is it...
  • Ordered Sets in the Calculus of Data Structures

    Ordered Sets in the Calculus of Data Structures

    Parse Tree. Given a grammar G = (A, N, S, R), t is a parse treeof G ifft is a node-labelled tree with ordered children that satisfies:. root is labeled by S . leaves are labelled by elements of A....
  • ETHICS  That Sounds so Formal.  Don Streit, LCSW

    ETHICS That Sounds so Formal. Don Streit, LCSW

    The school reported that eight year old Melanie had missed twelve days of school during the first semester. ... You both live in the same small town. Whenever she spots you in Wal-Mart she stops her shopping and almost runs...