E-Print Archive

There are 4249 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
* News 04/04/20 * The archive is using a new backend database. This has thrown up a few SQL errors in the last few days. If you have any issues please email adavey@nso.edu with either the number of eprint you are trying to edit or a link to your preprint.

Can Sub-photospheric Magnetic Reconnection Change the Elemental Composition in the Solar Corona? View all abstracts by submitter

Deb Baker   Submitted: 2020-03-09 02:47

Within the coronae of stars, abundances of those elements with low first ionization potential (FIP) often differ from their photospheric values. The coronae of the Sun and solar-type stars mostly show enhancements of low- FIP elements (the FIP effect) while more active stars such as M-dwarfs have coronae generally characterized by the inverse-FIP effect (I-FIP). Here we observe patches of I-FIP effect solar plasma in AR 12673, a highly complex beta/gamma/delta active region. We argue that the umbrae of coalescing sunspots and more specifically strong light bridges within the umbrae, are preferential locations for observing I-FIP effect plasma. Furthermore, the magnetic complexity of the active region and major episodes of fast flux emergence also lead to repetitive and intense flares. The induced evaporation of the chromospheric plasma in flare ribbons crossing umbrae enables the observation of four localized patches of I-FIP effect plasma in the corona of AR 12673. These observations can be interpreted in the context of the ponderomotive force fractionation model which predicts that plasma with I-FIP effect composition is created by the refraction of waves coming from below the chromosphere. We propose that the waves generating the I-FIP effect plasma in solar active regions are generated by sub-photospheric reconnection of coalescing flux systems. Although we only glimpse signatures of I-FIP effect fractionation produced by this interaction in patches on the Sun, on highly active M-stars it may be the dominant process.

Authors: Deborah Baker, Lidia van Driel-Gesztelyi, David H. Brooks, Pascal Demoulin, Gherardo Valori, David M. Long, J. Martin Laming, Andy S. H. To, Alexander W. James
Projects: None

Publication Status: Accepted ApJ
Last Modified: 2020-03-11 13:12
Go to main E-Print page  Magnetic connectivity between the light bridge and penumbra in a sunspot  Response of SDO/HMI observables to heating of the solar atmosphere by precipitating high-energy electrons  Edit Entry  Download Preprint  Submitter's Homepage 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
Ambipolar diffusion in the Bifrost code
Modeling the quiet Sun cell and network emission with ALMA
Clustering of fast Coronal Mass Ejections during the solar cycles 23 and 24 and implications for CME-CME interactions
Magnetic and Velocity Field Topology in Active Regions of Descending Phase of the Solar Cycle 23
Numerical simulation of solar photospheric jet-like phenomena caused by magnetic reconnection
Solar Flare-CME Coupling Throughout Two Acceleration Phases of a Fast CME
A new method for estimating global coronal wave properties from their interaction with solar coronal holes
Machine-learning approach to identification of coronal holes in solar disk images and synoptic maps
Multilevel Observations of the Oscillations in the First Active Region of the New Cycle
Standing MHD Waves in a Magnetic Slab Embedded in an Asymmetric Magnetic Plasma Environment: Surface Waves
A new facility for airborne solar astronomy: NASA's WB-57 at the 2017 total solar eclipse
MinXSS-2 CubeSat mission overview: Improvements from the successful MinXSS-1 mission
Lyman α Variability During Solar Flares Over Solar Cycle 24 Using GOES-15/EUVS-E
Sunquake with a second-bounce, other sunquakes and emission associated with X9.3 flare of 6 September 2017. II. Proposed interpretation
f-mode strengthening from a localized bipolar subsurface magnetic field
Imaging and spectral study on the null point of a fan-spine structure during a solar flare
Forecasting Solar Cycle 25 Using Deep Neural Networks
An Observational Test of Solar Plasma Heating by Magnetic Flux Cancellation
The Drivers of Active Region Outflows into the Slow Solar Wind
HXR emission from an activated flux rope and subsequent evolution of an eruptive long duration solar flare

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