E-Print Archive

There are 4354 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
Observation of Loop Connectivity Change in a Solar Flare Triggered by Loop-Loop Interaction View all abstracts by submitter

Linhui Sui   Submitted: 2005-09-30 08:37

Magnetic reconnection between two adjacent magnetic loops or arcades has been a longstanding model for solar flares. However, the observations supporting this quadrupolar flare model are mainly post-reconnection observations. We present a set of flare observations in EUV, X-rays and H which shows that a pre-flare loop changed its connectivity soon after the start of an M1 flare on June 2, 2002. A large arcade of loops seen in EUV expanded slowly at ~6 km s-1 about 3 min before the start of the flare. Another smaller EUV loop expanded rapidly at ~100 km s-1 at the start of the flare. After ~20 s, the smaller loop then reconnected with magnetic loops within the arcade, resulting in two new post-reconnection loops. The newly-formed, smaller EUV loop, with a long cusp at the looptop, was also observed in X-rays. The newly-formed, larger loop, visible in EUV and H, with a twisted structure and a jagged looptop, expanded outwards at ~490 km s-1. The 6-12 keV image during the first of two hard X-ray peaks showed the two footpoints of the newly-formed, smaller loop and a separate coronal source which was located much higher than the looptop seen later in the same energy band. We speculate that the coronal X-ray source was at or near the initial reconnecting point of the two interacting loops. All these observations indicate: (1) the loop-loop interaction was the trigger of the flare; (2) new loop systems do result from the magnetic reconnection of interacting loops; and (3) the cusp-shaped loops often seen in soft X-rays and EUV can be the product of the interaction of two loops.

Authors: Sui, L., Holman, G. D., Dennis, B. R.
Projects: RHESSI,Soho-MDI,TRACE

Publication Status: submitted to ApJ
Last Modified: 2005-09-30 08:37
Go to main E-Print page  Multi-Wavelength Study of the 3B/X1.2 Flare Observed on 2003 October 26  Multiwavelength Analysis of a Solar Flare on 2002 April 15  Edit Entry  Download Preprint  Delete Entry 

Key
Go to main E-Print pageGo to main E-Print page.
Previous AbstractPrevious Abstract.
Next AbstractNext Abstract.
Download PreprintDownload Preprint.
Submitter's HomepageSubmitters Homepage.
Edit EntryEdit Entry.
View All Abstracts By SubmitterView all abstracts by submitter.
Delete AbstractDelete abstract.

Latest Entries
Energy budget of plasma motions, heating, and electron acceleration in a three-loop solar flare
Space weather: the solar perspective - an update to Schwenn (2006)
Mixed properties of slow magnetoacoustic and entropy waves in a plasma with heating/cooling misbalance
The morphology of average solar flare time profiles from observations of the Sun's lower atmosphere
Indications of stellar coronal mass ejections through coronal dimmings
Could switchbacks originate in the lower solar atmosphere? II. Propagation of switchbacks in the solar corona
Solar large-scale magnetic field and cycle patterns in solar dynamo
Three-dimensional magnetic reconnection in astrophysical plasmas
Energy partition in a confined flare with an extreme-ultraviolet late phase
Alfvén wave heating in partially ionized thin threads of solar prominences
He I 10830 Dimming During Solar Flares, I: The Crucial Role of Non-Thermal Collisional Ionisations
Separating aa-index into Solar and Hale Cycle Related Components Using Principal Component Analysis
Inward Propagating Plasma Parcels in the Solar Corona: Models with Aerodynamic Drag, Ablation, and Snowplow Accretion
Energetics and 3-D Structure of Elementary Events in Solar Coronal Heating
Stellar Superflares Observed Simultaneously with Kepler and XMM-Newton
Medium-term predictions of F10.7 and F30 cm solar radio flux with the adaptive Kalman filter
Resonances in a Coronal Loop Driven by Torsional Alfvén Waves Propagating from the Photosphere
Effects of external flow on resonant absorption of coronal loop kink oscillations driven by an external fast wave: Selective excitation problem
Emerging Dimming as Coronal Heating Episodes
Proxy-Based Prediction of Solar Extreme Ultraviolet Emission using Deep Learning

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



© 2000-2020 Solar Physics Group - Montana State University