The Helioseismic and Magnetic Imager (HMI) Vector Magnetic Field Pipeline: SHARPs – Space-Weather HMI Active Region Patches
A new data product from the Helioseismic and Magnetic Imager (HMI) onboard the Solar Dynamics Observatory (SDO) called Space-weather HMI Active Region Patches (SHARPs) is now available. SDO/HMI is…
The Helioseismic and Magnetic Imager (HMI) Vector Magnetic Field Pipeline: Overview and Performance
- J. Hoeksema, Yang Liu, M. Turmon
- Physics, Geology
- 25 March 2014
The Helioseismic and Magnetic Imager (HMI) began near-continuous full-disk solar measurements on 1 May 2010 from the Solar Dynamics Observatory (SDO). An automated processing pipeline keeps pace with…
H alpha Surges and X-Ray Jets in AR 7260
- R. Canfield, K. Reardon, K. Leka, K. Shibata, T. Yokoyama, M. Shimojo
- Physics
- 1 June 1996
The Evolution of Pores and the Development of Penumbrae
- K. Leka, A. Skumanich
- Physics
- 1 November 1998
We investigate the evolution of the magnetic field in an emerging active region near disk center using data from the Advanced Stokes Polarimeter. Specifically, we follow the formation of a pore from…
Evidence for Current-carrying Emerging Flux
- K. Leka, R. Canfield, A. Mcclymont, L. Driel-Gesztelyi
- Physics
- 1996
To determine the relationship between electric currents and magnetic flux in emerging sunspots, we use observations of the morphology, proper motion, magnetic flux, and currents associated with…
Resolving the 180° Ambiguity in Solar Vector Magnetic Field Data: Evaluating the Effects of Noise, Spatial Resolution, and Method Assumptions
The objective testing of algorithms for performing ambiguity resolution in vector magnetic field data is continued, with an examination of the effects of noise in the data. Through the use of…
An Overview of Existing Algorithms for Resolving the 180° Ambiguity in Vector Magnetic Fields: Quantitative Tests with Synthetic Data
- T. Metcalf, K. Leka, Y. Moon
- Geology
- 23 July 2006
We report here on the present state-of-the-art in algorithms used for resolving the 180° ambiguity in solar vector magnetic field measurements. With present observations and techniques, some…
The imaging vector magnetograph at Haleakala
- D. Mickey, R. Canfield, B. Labonte, K. Leka, M. Waterson, H. Weber
- Physics
- 1 October 1996
We describe an instrument we have built and installed at Mees Solar Observatory on Haleakala, Maui, to measure polarization in narrow-band solar images. Observations in Zeemansensitive photospheric…
Evaluating the Performance of Solar Flare Forecasting Methods
The number of published approaches to solar flare forecasting using photospheric magnetic field observations has proliferated recently, with widely varying claims about how well each works. As…
A CRITICAL ASSESSMENT OF NONLINEAR FORCE-FREE FIELD MODELING OF THE SOLAR CORONA FOR ACTIVE REGION 10953
- M. Derosa, C. Schrijver, T. Tadesse
- Physics
- 6 February 2009
Nonlinear force-free field (NLFFF) models are thought to be viable tools for investigating the structure, dynamics, and evolution of the coronae of solar active regions. In a series of NLFFF modeling…
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