E-Print Archive

There are 3897 abstracts currently viewable.


Search:

Advanced Search
Options
Main Page Add New E-Print Submitter
Information
Feedback
News Help/FAQ About Preferences
Manage Key Phrase
Notification
Observing the solar corona with a tunable Fabry-Perot filter  

David Rust   Submitted: 2008-12-23 12:11

A solid Fabry-Perot etalon with a 0.16 ? passband was used during the 180 s solar eclipse of 2006 for rapid scans of an emission line of the solar corona. The etalon was a Y-cut lithium niobate wafer coated with reflective and conductive (ITO) layers. Voltage applied perpendicular to the etalon face produced a passband shift of 0.0011 ? V-1. During the eclipse, 18 filtergrams were obtained at six 0.22 ? steps across the profile of the forbidden [Fe X] spectral emission line at 6374.4 ?, which results from the 106 K coronal plasma. The 9.3?9.3 arcmin field of view showed the structure of the corona above a newly emerged sunspot region. We discuss tests performed on the etalon before and after the eclipse. We also discuss the coronal observations, which show some features with 10 km s-1 velocities in the line of sight.

Authors: Matthew W. Noble, David M. Rust, Pietro N. Bernasconi, Jay M. Pasachoff, Bryce A. Babcock, and Megan A. Bruck
Projects: None

Publication Status: Published in Applied Optics, Vol. 47, Issue 31, pp. 5744-5749 doi:10.1364/AO.47.005744
Last Modified: 2008-12-23 12:26
Go to main E-Print page  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

COMPARISON OF INTERPLANETARY DISTURBANCES AT THE NEAR SPACECRAFT WITH CORONAL MASS EJECTIONS AT THE SUN  

David Rust   Submitted: 2005-02-07 07:54

We examined interplanetary magnetic field disturbances recorded at the NEAR-Shoemaker spacecraft when it was above either the east or west solar limb as seen from Earth, and then we identified the associated coronal mass ejections (CMEs) detected above the limbs by the SOHO/LASCO coronagraph. We found 10 cases where a non-recurring IP disturbance could be associated with a CME. Eight of the disturbances included a magnetic flux rope signature. Flux rope chirality and axis orientation were determined for each one and compared with chirality and axis orientation at the Sun, as inferred from flux-rope signatures – filaments and sigmoids – that could be associated with the CMEs. In most cases, the chirality and orientation inferred from these pre-eruption flux rope signatures agreed well with the flux rope signatures at NEAR. These results suggest, in agreement with Plunkett et al. (2000), that the flux ropes existed prior to eruption and that the flux ropes on the Sun become flux ropes in interplanetary space. Comparisons of the CME speeds to the time-of-flight (TOF) average speeds showed that flux ropes are less accelerated or decelerated by the solar wind than are the CME leading edges. These results imply that the faint features or loops that make up the CME leading edges are probably distinct from the flux ropes.

Authors: RUST, D.M, ANDERSON, B.J., ANDREWS, M.D., ACUÑA, M. H., RUSSELL, C. T., SCHUCK, P. W., AND MULLIGAN, T
Projects: None

Publication Status: ApJ. (in press)
Last Modified: 2005-02-07 07:54
Go to main E-Print page  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

OBSERVATIONAL EVIDENCE OF THE KINK INSTABILITY IN SOLAR FILAMENT ERUPTIONS AND SIGMOIDS  

David Rust   Submitted: 2005-02-07 07:43

Two lines of observational evidence are used to infer that the MHD helical kink instability is associated with solar eruptions. The sense of twist and writhe are determined in images of 7 erupting filaments obtained at 10830 Å, 1600 Å, 195 Å and 171 Å. In every case the sense of twist is the same as the sense of writhe, as required for a kink. From images in the soft X-ray and EUV spectrum, measurements of the height/width ratio of 623 sigmoids show a mean value of 5.47, which is the ratio expected for kinked flux ropes.

Authors: Rust, D.M., and LaBonte, B.J.
Projects: None

Publication Status: ApJ. Letts. (in press)
Last Modified: 2005-02-07 07:43
Go to main E-Print page  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 


Key
Go to main E-Print pageGo to main E-Print page.
Download PreprintDownload Preprint.
Submitter's HomepageSubmitters Homepage.
Edit EntryEdit Entry.
Delete AbstractDelete abstract.

Abstracts by Author
Observing the solar corona with a tunable Fabry-Perot filter
COMPARISON OF INTERPLANETARY DISTURBANCES AT THE NEAR SPACECRAFT WITH CORONAL MASS EJECTIONS AT THE SUN
OBSERVATIONAL EVIDENCE OF THE KINK INSTABILITY IN SOLAR FILAMENT ERUPTIONS AND SIGMOIDS

Related Pages
MSU Solar Physics.
Max Millennium Science Mail Archive.
Max Millennium Message of the Day Mail Archive.
Max Millennium Flare Catalog

Archive Maintainer
Alisdair Davey



© 2003 Solar Physics Group - Montana State University