Zobrazeno 1 - 10
of 94
pro vyhledávání: '"Hannah, Iain G."'
Microflares are energetically smaller versions of solar flares, demonstrating the same processes of plasma heating and particle acceleration. However, it remains unclear down to what energy scales this impulsive energy release continues, which has im
Externí odkaz:
http://arxiv.org/abs/2402.05426
Autor:
Duncan, Jessie, Masek, Reed B., Shih, Albert Y., Glesener, Lindsay, Barnes, Will, Reeves, Katharine K., Zhang, Yixian, Hannah, Iain G., Grefenstette, Brian W.
Solar active regions contain a broad range of temperatures, with the thermal plasma distribution often observed to peak in the few millions of kelvin. Differential emission measure (DEM) analysis can allow instruments with diverse temperature respons
Externí odkaz:
http://arxiv.org/abs/2312.05109
Autor:
da Silva, Douglas Félix, Hui, Li, Simões, Paulo J. A., Valio, Adriana, R., Joaquim C. E., Hudson, Hugh S., Simoes, Paulo J. A., Fletcher, Lyndsay, Hayes, Laura A., Hannah, Iain G.
Understanding the physical processes that trigger solar flares is paramount to help with forecasting space weather and mitigating the effects on our technological infrastructure. A previously unknown phenomenon was recently identified in solar flares
Externí odkaz:
http://arxiv.org/abs/2308.11017
Extreme-ultraviolet (EUV) observations provide considerable insight into evolving physical conditions in the active solar atmosphere. For a prescribed density and temperature structure, it is straightforward to construct the corresponding differentia
Externí odkaz:
http://arxiv.org/abs/2301.04688
Autor:
Long, David M., Chitta, Lakshmi Pradeep, Baker, Deborah, Hannah, Iain G., Ngampoopun, Nawin, Berghmans, David, Zhukov, Andrei N., Teriaca, Luca
Coronal jets are short-lived eruptive features commonly observed in polar coronal holes and are thought to play a key role in the transfer of mass and energy into the solar corona. We describe unique contemporaneous observations of a coronal blowout
Externí odkaz:
http://arxiv.org/abs/2301.02034
Autor:
Paterson, Sarah, Hannah, Iain G., Grefenstette, Brian W., Hudson, Hugh, Krucker, Säm, Glesener, Lindsay, White, Stephen M., Smith, David M.
We present the first survey of quiet Sun features observed in hard X-rays (HXRs), using the the Nuclear Spectroscopic Telescope ARray (NuSTAR), a HXR focusing optics telescope. The recent solar minimum combined with NuSTAR's high sensitivity has pres
Externí odkaz:
http://arxiv.org/abs/2210.01544
Autor:
Cooper, Kristopher, Hannah, Iain G., Grefenstette, Brian W., Glesener, Lindsay, Krucker, Säm, Hudson, Hugh S., White, Stephen M., Smith, David M., Duncan, Jessie
We investigate the spatial, temporal, and spectral properties of 10 microflares from AR12721 on 2018 September 9 and 10 observed in X-rays using the Nuclear Spectroscopic Telescope ARray (NuSTAR) and the Solar Dynamic Observatory's Atmospheric Imagin
Externí odkaz:
http://arxiv.org/abs/2109.00263
Autor:
Duncan, Jessie, Glesener, Lindsay, Grefenstette, Brian W., Vievering, Juliana, Hannah, Iain G., Smith, David M., Krucker, Säm, White, Stephen M., Hudson, Hugh
Solar flares are explosive releases of magnetic energy. Hard X-ray (HXR) flare emission originates from both hot (millions of Kelvin) plasma and nonthermal accelerated particles, giving insight into flare energy release. The Nuclear Spectroscopic Tel
Externí odkaz:
http://arxiv.org/abs/2011.06651
The study of the localized plasma conditions before the impulsive phase of a solar flare can help us understand the physical processes that occur leading up to the main flare energy release. Here, we present evidence of a hot X-ray onset interval of
Externí odkaz:
http://arxiv.org/abs/2007.05310
Autor:
Cooper, Kristopher, Hannah, Iain G., Grefenstette, Brian W., Glesener, Lindsay, Krucker, Säm, Hudson, Hugh S., White, Stephen M., Smith, David M.
Publikováno v:
The Astrophysical Journal Letters, 893:L40 (7pp), 2020 April 20
We present X-ray imaging spectroscopy of one of the weakest active region (AR) microflares ever studied. The microflare occurred at $\sim$11:04 UT on 2018 September 9 and we studied it using the Nuclear Spectroscopic Telescope ARray (NuSTAR) and the
Externí odkaz:
http://arxiv.org/abs/2004.11176