Photospheric Abundances of Polar Jets on the Sun Observed by Hinode

Abstract

Many jets are detected at X-ray wavelengths in the Sun's polar regions, and the ejected plasma along the jets has been suggested to contribute mass to the fast solar wind. From in-situ measurements in the magnetosphere, it has been found that the fast solar wind has photospheric abundances while the slow solar wind has coronal abundances. Therefore, we investigated the abundances of polar jets to determine whether they are the same as that of the fast solar wind. For this study, we selected 22 jets in the polar region observed by Hinode/EIS (EUV Imaging Spectrometer) and XRT (X-Ray Telescope) simultaneously on 2007 November 1-3. We calculated the First Ionization Potential (FIP) bias factor from the ratio of the intensity between high (S) and low (Si, Fe) FIP elements using the EIS spectra. The values of the FIP bias factors for the polar jets are around 0.7-1.9, and 75$\%$ of the values are in the range of 0.7-1.5, which indicates that they have photospheric abundances similar to the fast solar wind. The results are consistent with the reconnection jet model where photospheric plasma emerges and is rapidly ejected into the fast wind.

16 pages, 6 figures, 2 tables, accepted for publication in ApJ

References in corpus (4)

• Flows and Non-thermal Velocities in Solar Active Regions Observed with the Extreme-ultraviolet Imaging Spectrometer on Hinode: A Tracer of Active Region Sources of Heliospheric Magnetic Fields?
• FIP Bias Evolution in a Decaying Active Region
• Physical properties of solar polar jets: A statistical study with Hinode XRT data
• Dark jets in solar coronal holes

Cited by in corpus (6)

• The First Ionization Potential Effect from the Ponderomotive Force: On the Polarization and Coronal Origin of the Alfven Waves
• The Contribution of Coronal Jets To The Solar Wind
• A diagnostic of coronal elemental behavior during the inverse FIP effect in solar flares
• Formation and Thermodynamic Evolution of plasmoids in active region jets
• Coronal Abundance Fractionation Linked to Chromospheric Transverse MHD Waves in a Solar Active Region Observed with FISS/GST and EIS/Hinode
• An elemental abundance diagnostic for coordinated Solar Orbiter/SPICE and Hinode/EIS observations