|
Notice:
|
Found 12 entries in the Bibliography.
Showing entries from 1 through 12
| 2023 |
|
Magnetic Reconnection as the Driver of the Solar Wind We present EUV solar observations showing evidence for omnipresent jetting activity driven by small-scale magnetic reconnection at the base of the solar corona. We argue that the physical mechanism that heats and drives the solar wind at its source is ubiquitous magnetic reconnection in the form of small-scale jetting activity (a.k.a. jetlets). This jetting activity, like the solar wind and the heating of the coronal plasma, is ubiquitous regardless of the solar cycle phase. Each event arises from small-scale reconnection of ... Raouafi, Nour; Stenborg, G.; Seaton, D.~B.; Wang, H.; Wang, J.; DeForest, C.~E.; Bale, S.~D.; Drake, J.~F.; Uritsky, V.~M.; Karpen, J.~T.; DeVore, C.~R.; Sterling, A.~C.; Horbury, T.~S.; Harra, L.~K.; Bourouaine, S.; Kasper, J.~C.; Kumar, P.; Phan, T.~D.; Velli, M.; Published by: \apj Published on: mar YEAR: 2023 DOI: 10.3847/1538-4357/acaf6c Parker Data Used; Solar corona; Solar wind; magnetic fields; Solar magnetic reconnection; 1483; 1534; 994; 1504; Astrophysics - Solar and Stellar Astrophysics; Physics - Space Physics |
|
Small-scale EUV features as the drivers of coronal upflows in the quiet Sun Context. Coronal upflows in the quiet Sun are seen in a wide range of features, including jets and filament eruptions. The in situ measurements from Parker Solar Probe within \ensuremath\approx0.2 au have demonstrated that the solar wind is highly structured, showing abrupt and near-ubiquitous magnetic field reversals (i.e., switchbacks) on different timescales. The source of these structures has been associated with supergranular structures on the solar disc. This raises the question of whether there are additional small co ... Schwanitz, Conrad; Harra, Louise; Mandrini, Cristina; Sterling, Alphonse; Raouafi, Nour; Cormack, Cecilia; Berghmans, David; Auchère, Fr\; Barczynski, Krzysztof; Cuadrado, Regina; Buchlin, Eric; Kraaikamp, Emil; Long, David; Parenti, Susanna; Peter, Hardi; Rodriguez, Luciano; Schühle, Udo; Smith, Phil; Teriaca, Luca; Verbeeck, Cis; Zhukov, Andrei; Published by: \aap Published on: jun YEAR: 2023 DOI: 10.1051/0004-6361/202346036 Parker Data Used; Sun: corona; Solar wind; Sun: UV radiation |
| 2022 |
|
We examine in greater detail five events previously identified as being sources of strong transient coronal outflows in a solar polar region in Hinode/Extreme Ultraviolet (EUV) Imaging Spectrometer (EIS) Doppler data. Although relatively compact or faint and inconspicuous in Hinode/X-ray Telescope (XRT) soft-X-ray (SXR) images and in Solar Dynamics Observatory (SDO)/Atmospheric Imaging Assembly (AIA) EUV images, we find that all of these events are consistent with being faint coronal X-ray jets. The evidence for this is that ... Sterling, Alphonse; Schwanitz, Conrad; Harra, Louise; Raouafi, Nour; Panesar, Navdeep; Moore, Ronald; Published by: \apj Published on: nov YEAR: 2022 DOI: 10.3847/1538-4357/ac9960 Parker Data Used; Solar filament eruptions; Solar corona; Solar x-ray emission; Solar extreme ultraviolet emission; 1981; 1483; 1536; 1493; Astrophysics - Solar and Stellar Astrophysics; Physics - Space Physics |
|
Franci, Luca; Papini, Emanuele; Del Sarto, Daniele; Hellinger, Petr; Burgess, David; Matteini, Lorenzo; Landi, Simone; Montagud-Camps, Victor; Published by: Universe Published on: aug YEAR: 2022 DOI: 10.3390/universe8090453 |
| 2021 |
|
Probing Upflowing Regions in the Quiet Sun and Coronal Holes Recent observations from Parker Solar Probe have revealed that the solar wind has a highly variable structure. How this complex behaviour is formed in the solar corona is not yet known, since it requires omnipresent fluctuations, which constantly emit material to feed the wind. In this article we analyse 14 upflow regions in the solar corona to find potential sources for plasma flow. The upflow regions are derived from spectroscopic data from the EUV Imaging Spectrometer (EIS) on board Hinode determining their Doppler veloci ... Schwanitz, Conrad; Harra, Louise; Raouafi, Nour; Sterling, Alphonse; Vacas, Alejandro; Iniesta, Jose; arez, David; Hara, Hirohisa; Published by: \solphys Published on: dec YEAR: 2021 DOI: 10.1007/s11207-021-01915-0 Parker Data Used; Corona; structures; Coronal holes; Jets; Astrophysics - Solar and Stellar Astrophysics |
| 2020 |
|
Coronal-jet-producing Minifilament Eruptions as a Possible Source of Parker Solar Probe Switchbacks The Parker Solar Probe (PSP) has observed copious rapid magnetic field direction changes in the near-Sun solar wind. These features have been called "switchbacks," and their origin is a mystery. But their widespread nature suggests that they may be generated by a frequently occurring process in the Sun\textquoterights atmosphere. We examine the possibility that the switchbacks originate from coronal jets. Recent work suggests that many coronal jets result when photospheric magnetic flux cancels, and forms a small-scale "m ... Sterling, Alphonse; Moore, Ronald; Published by: The Astrophysical Journal Published on: 06/2020 YEAR: 2020 DOI: 10.3847/2041-8213/ab96be 1503; 1504; 1534; 1981; Astrophysics - Solar and Stellar Astrophysics; Parker Data Used; parker solar probe; Physics - Space Physics; Solar Probe Plus |
|
The Solar Probe Cup on the Parker Solar Probe Solar Probe Cup (SPC) is a Faraday cup instrument on board NASA\textquoterights Parker Solar Probe (PSP) spacecraft designed to make rapid measurements of thermal coronal and solar wind plasma. The spacecraft is in a heliocentric orbit that takes it closer to the Sun than any previous spacecraft, allowing measurements to be made where the coronal and solar wind plasma is being heated and accelerated. The SPC instrument was designed to be pointed directly at the Sun at all times, allowing the solar wind (which is flowing p ... Case, A.; Kasper, Justin; Stevens, Michael; Korreck, Kelly; Paulson, Kristoff; Daigneau, Peter; Caldwell, Dave; Freeman, Mark; Henry, Thayne; Klingensmith, Brianna; Bookbinder, J.; Robinson, Miles; Berg, Peter; Tiu, Chris; Wright, K.; Reinhart, Matthew; Curtis, David; Ludlam, Michael; Larson, Davin; Whittlesey, Phyllis; Livi, Roberto; Klein, Kristopher; c, Mihailo; Published by: The Astrophysical Journal Supplement Series Published on: 02/2020 YEAR: 2020 DOI: 10.3847/1538-4365/ab5a7b Astrophysics - Instrumentation and Methods for Astrophysics; Astrophysics - Solar and Stellar Astrophysics; Parker Data Used; parker solar probe; Physics - Plasma Physics; Physics - Space Physics; Solar Probe Plus |
| 2018 |
|
Solar wind turbulence within high-speed streams is reviewed from the point of view of embedded single nonlinear Alfv\ en wave cycles, discontinuities, magnetic decreases (MDs), and shocks. For comparison and guidance, cometary plasma turbulence is also briefly reviewed. It is demonstrated that cometary nonlinear magnetosonic waves phase-steepen, with a right-hand circular polarized foreshortened front and an elongated, compressive trailing edge. The former part is a form of "wave breaking" and the latter that of "period d ... Tsurutani, Bruce; Lakhina, Gurbax; Sen, Abhijit; Hellinger, Petr; Glassmeier, Karl-Heinz; Mannucci, Anthony; Published by: Journal of Geophysical Research: Space Physics Published on: 01/2018 YEAR: 2018 DOI: 10.1002/jgra.v123.410.1002/2017JA024203 Alfv\ en waves; discontinuities; interplanetary turbulence; magnetic decreases; parker solar probe; period doubling; Solar Probe Plus; wave phase-steepening |
| 2017 |
|
The Parametric Instability of Alfv\ en Waves: Effects of Temperature Anisotropy Tenerani, Anna; Velli, Marco; Hellinger, Petr; Published by: \apj Published on: 12/2017 YEAR: 2017 DOI: 10.3847/1538-4357/aa9bef Parker Data Used; instabilities; plasmas; Sun: heliosphere; waves; Physics - Space Physics |
|
Advancements in hardware design for the frontier radio used for the solar probe plus mission The Frontier Radio for the Solar Probe Plus mission offers a host of hardware design and manufacturing improvements. These improvements build on the technology readiness level (TRL)-9 radio platform that was flown on the Van Allen Probes mission in a duplexed S-band configuration and several development tasks funded by NASA Headquarters. Prior RF slice designs consisted of two separate circuit boards: one for lower frequencies and one for high-frequencies; advances in technology enabled the use of a high-frequency multilayer ... Angert, Matthew; Bubnash, Brian; Hearty, Ryan; Neill, Michael; Ling, Sharon; Matlin, Daniel; Cheng, Sheng; Published by: IEEE Aerospace Conference Proceedings Published on: Digital signal processing; Field programmable gate arrays (FPGA); Integrated circuit design; Interplanetary flight; Magnesium alloys; Manufacture; NASA; Probes; Random access storage; Parker Engineering |
| 2014 |
|
Magnetic Reconnection and Intermittent Turbulence in the Solar Wind Osman, K.~T.; Matthaeus, W.~H.; Gosling, J.~T.; Greco, A.; Servidio, S.; Hnat, B.; Chapman, S.~C.; Phan, T.~D.; Published by: \prl Published on: 05/2014 YEAR: 2014 DOI: 10.1103/PhysRevLett.112.215002 Parker Data Used; 94.05.Lk; 52.35.Vd; 96.50.Bh; 96.50.Ci; turbulence; magnetic reconnection; interplanetary magnetic fields; Solar wind plasma; sources of solar wind; Physics - Space Physics; Physics - Data Analysis; Statistics and Probability; Physics - Plasma Physics |
| 2013 |
|
We present a new data analysis method enabling the observation of magnetic field fluctuations associated with temperature anisotropy instabilities using the Ulysses spacecraft. The movement of the spacecraft away from the Sun causes the observed plasma conditions, turbulent fluctuation amplitude, magnetic field strength and important physical scales to change. We normalize wavelet power spectra of the magnetic field using local values for the proton gyroscale and large scale magnetic field fluctuation amplitude to remove ... Wicks, Robert; Matteini, Lorenzo; Horbury, Timothy; Hellinger, Petr; Roberts, Aaron; Published by: Published on: 07/2013 YEAR: 2013 DOI: 10.1063/1.4811048 96.50.Ci; 96.60.Hv; 96.60.Tf; 96.60.Vg; astrophysical plasma; data analysis; parker solar probe; plasma instability; solar magnetism; Solar Probe Plus; solar spectra; Solar wind; Solar wind plasma; sources of solar wind; wavelet transforms |
1
