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Future High-Resolution and High-Cadence Observations for Unraveling Small-Scale Explosive Solar Features
Alphonse C. Sterling, Ronald L. Moore, Navdeep K. Panesar +3
Solar coronal jets are frequently occurring collimated ejections of solar plasma, originating from magnetically mixed polarity locations on the Sun of size scale comparable to that…
The First Flight of the Marshall Grazing Incidence X-ray Spectrometer (MaGIXS)
Sabrina L. Savage, Amy R. Winebarger, Ken Kobayashi +34
The Marshall Grazing Incidence X-ray Spectrometer (MaGIXS) sounding rocket experiment launched on July 30, 2021 from the White Sands Missile Range in New Mexico. MaGIXS is a unique…
Chromospheric and Coronal heating in active region plage by dissipation of currents from braiding
Souvik Bose, Bart De Pontieu, Viggo Hansteen +3
It remains unclear which physical processes are responsible for the dramatic increase with height of the temperature in stellar atmospheres, known as the chromospheric (10,00…
Defining the Middle Corona
Matthew J. West, Daniel B. Seaton, David B. Wexler +31
The middle corona, the region roughly spanning heliocentric altitudes from to , encompasses almost all of the influential physical transitions and processes that…
Parallel plasma loops and the energization of the solar corona
Hardi Peter, Lakshmi Pradeep Chitta, Feng Chen +15
The outer atmosphere of the Sun is composed of plasma heated to temperatures well in excess of the visible surface. We investigate short cool and warm (<1 MK) loops seen in the cor…
A publicly available multi-observatory data set of an enhanced network patch from the Photosphere to Corona
Adam R. Kobelski, Lucas A. Tarr, Sarah A. Jaeggli +3
New instruments sensitive to chromospheric radiation at X-ray, UV, Visible, IR, and sub-mm wavelengths have become available that significantly enhance our ability to understand th…
Further Evidence for the Minifilament-Eruption Scenario for Solar Polar Coronal Jets
Tomi K. Baikie, Alphonse C. Sterling, Ronald L. Moore +4
We examine a sampling of 23 polar-coronal-hole jets. We first identified the jets in soft X-ray (SXR) images from the X-ray telescope (XRT) on the Hinode spacecraft, over 2014-2016…
A Solar Magnetic-fan Flaring Arch Heated by Non-thermal Particles and Hot Plasma from an X-ray Jet Eruption
Kyoung-Sun Lee, Hirohisa Hara, Kyoko Watanabe +10
We have investigated an M1.3 limb flare, which develops as a magnetic loop/arch that fans out from an X-ray jet. Using Hinode/EIS, we found that the temperature increases with heig…
The drivers of active region outflows into the slow solar wind
David H. Brooks, Amy R. Winebarger, Sabrina Savage +13
Plasma outflows from the edges of active regions have been suggested as a possible source of the slow solar wind. Spectroscopic measurements show that these outflows have an enhanc…
Is the High-Resolution Coronal Imager Resolving Coronal Strands? Results from AR 12712
Thomas Williams, Robert W. Walsh, Amy R. Winebarger +14
Following the success of the first mission, the High-Resolution Coronal Imager (Hi-C) was launched for a third time (Hi-C 2.1) on 29th May 2018 from the White Sands Missile Range,…
Hi-C 2.1 Observations of Small-Scale Miniature-Filament-Eruption-Like Cool Ejections in Active Region Plage
Alphonse C. Sterling, Ronald L. Moore, Navdeep K. Panesar +5
We examine 172 Ang ultra-high-resolution images of a solar plage region from the Hi-C 2.1 ("Hi-C") rocket flight of 2018 May 29. Over its five-minute flight, Hi-C resolves a pletho…
Hi-C 2.1 Observations of Jetlet-like Events at Edges of Solar Magnetic Network Lane
Navdeep K. Panesar, Alphonse C. Sterling, Ronald L. Moore +15
We present high-resolution, high-cadence observations of six, fine-scale, on-disk jet-like events observed by the High-resolution Coronal Imager 2.1 (Hi-C 2.1) during its sounding-…
Fine-scale explosive energy release at sites of prospective magnetic flux cancellation in the core of the solar active region observed by Hi-C 2.1, IRIS and SDO
Sanjiv K. Tiwari, Navdeep K. Panesar, Ronald L. Moore +14
The second Hi-C flight (Hi-C2.1) provided unprecedentedly-high spatial and temporal resolution (250km, 4.4s) coronal EUV images of Fe IX/X emission at 172 Å, of AR 12712 on 2…
The High-Resolution Coronal Imager, Flight 2.1
Laurel A. Rachmeler, Amy R. Winebarger, Sabrina L. Savage +49
The third flight of the High-Resolution Coronal Imager (Hi-C 2.1) occurred on May 29, 2018, the Sounding Rocket was launched from White Sands Missile Range in New Mexico. The instr…
Solar Active Region Heating Diagnostics from High Temperature Emission using the Marshall Grazing Incidence X-ray Spectrometer (MaGIXS)
P. S. Athiray, Amy R. Winebarger, Will T. Barnes +7
The relative amount of high temperature plasma has been found to be a useful diagnostic to determine the frequency of coronal heating on sub-resolution structures. When the loops a…
Signatures of the non-Maxwellian -distributions in optically thin line spectra. II. Synthetic Fe XVII--XVIII X-ray coronal spectra and predictions for the Marshall Grazing-Incidence X-ray Spectrometer (MaGIXS)
Jaroslav Dudik, Elena Dzifcakova, Giulio Del Zanna +4
We investigated the possibility of diagnosing the degree of departure from the Maxwellian distribution using the Fe XVII - Fe XVIII spectra originating in plasmas in collisional io…
Unfolding overlapped slitless imaging spectrometer data for extended sources
Amy Winebarger, Mark Weber, Christian Bethge +9
Slitless spectrometers can provide simultaneous imaging and spectral data over an extended field of view, thereby allowing rapid data acquisition for extended sources. In some inst…
An exploration of heating mechanisms in a supra-arcade plasma sheet formed after a coronal mass ejection
Katharine K. Reeves, Michael S. Freed, David E. McKenzie +1
We perform a detailed analysis of the thermal structure of the region above the post-eruption arcade for a flare that occurred on 2011 October 22. During this event, a sheet of hot…
Miniature loops in the solar corona
Krzysztof Barczynski, Hardi Peter, Sabrina L. Savage
Magnetic loops filled with hot plasma are the main building blocks of the solar corona. Usually they have lengths of the order of the barometric scale height in the corona that is…
Hi-C Observations of Sunspot Penumbral Bright Dots
Shane E. Alpert, Sanjiv K. Tiwari, Ronald L. Moore +2
We report observations of bright dots (BDs) in a sunspot penumbra using High Resolution Coronal Imager (Hi-C) data in 193 Å and examine their sizes, lifetimes, speeds, and intensit…
Signatures of the non-Maxwellian -distributions in optically thin line spectra \subtitle{I. Theory and synthetic Fe IX--XIII spectra}
J. Dudík, G. Del Zanna, H. E. Mason +1
We investigate the possibility of diagnosing the degree of departure from the Maxwellian distribution using single-ion spectra originating in astrophysical plasmas in collisional i…
A Multi-Wavelength Statistical Study of Supra-Arcade Downflows
Sabrina Savage, David McKenzie
Sunward-flowing voids above post-coronal mass ejection flare arcades, also known as supra-arcade downflows (SADs), have characteristics consistent with post-reconnection magnetic f…
Re-interpretation of Supra-Arcade Downflows in Solar Flares
Sabrina L. Savage, David E. McKenzie, Katharine K. Reeves
Following the eruption of a filament from a flaring active region, sunward-flowing voids are often seen above developing post-eruption arcades. First discovered using the soft X-ra…
Low-Altitude Reconnection Inflow-Outflow Observations during a 2010 November 3 Solar Eruption
S. L. Savage, G. Holman, K. K. Reeves +3
For a solar flare occurring on 2010 November 3, we present observations using several SDO/AIA extreme-ultraviolet (EUV) passbands of an erupting flux rope followed by inflows sweep…