Lectures on Solar Physics

Antia, H. M.; Bhatnagar, A.; Ulmschneider, P.

doi:10.1007/3-540-36963-5

Cited by 6 publications

(1 citation statement)

References 318 publications

(441 reference statements)

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“…Solar radiation emitted from the different regions of the solar atmosphere tends to vary differently as a result of the different processes driving the dynamics within them. For example, bright plasma tends to be concentrated regionally in active region mag-netic loops in the corona, whereas in the chromosphere, bright plasma is distributed more uniformly across a magnetic network (Antia et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

The GOES-R EUVS model for EUV irradiance variability

Thiemann

Eparvier

Woodraska

et al. 2019

J. Space Weather Space Clim.

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The Geostationary Operational Environmental Satellite R (GOES-R) series of four satellites are the next generation NOAA GOES satellites. Once on orbit and commissioned, they are renamed GOES 16-19, making critical terrestrial and space weather measurements through 2035. GOES 16 and 17 are currently on orbit, having been launched in 2016 and 2018, respectively. The GOES-R satellites include the EUV and X-ray Irradiance Sensors (EXIS) instrument suite, which measures calibrated solar irradiance in 8 lines or bands between 25 and 285 nm with the Extreme Ultraviolet Sensors (EUVS) instrument. EXIS also includes the X-Ray Sensor (XRS) instrument, which measures solar soft X-ray irradiance at the legacy GOES bands. The EUVS measurements are used as inputs to the EUVS Model, a solar spectral irradiance model for space weather operations that predicts irradiance in twenty-two 5 nm wide intervals from 5 nm to 115 nm, and one 10 nm wide interval from 117 to 127 nm at 30 second cadence. Once fully operational, NOAA will distribute the EUVS Model irradiance with 1 minute latency as a primary space weather data product, ushering in a new era of rapid dissemination and measurement continuity of EUV irradiance spectra. This paper describes the EUVS Model algorithms, data sources, calibration methods and associated uncertainties. Typical model (relative) uncertainties are less than ∼5% for variability at time-scales longer than 6 hours, and are ∼25% for solar flare induced variability. The absolute uncertainties, originating from the instruments used to calibrate the EUVS Model, are ∼10%. Examples of model results are presented at both sub-daily and multi-year timescales to demonstrate the model's capabilities and limitations. Example solar flare irradiances are also modeled.

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Section: Introductionmentioning

confidence: 99%

The GOES-R EUVS model for EUV irradiance variability

Thiemann

Eparvier

Woodraska

et al. 2019

J. Space Weather Space Clim.

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Generalized Bohm sheath criterion in dusty plasma of space environment

Sadatian

ghiyaei

2021

Advances in Space Research

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Statistical properties of superflares on solar-type stars based on the Kepler 1-min cadence data

et al. 2015

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We searched for superflares on solar-type stars using the Kepler short-cadence (1min sampling) data in order to detect superflares with short duration. We found 187 superflares on 23 solar-type stars whose bolometric energy ranges from the order of 10 32 erg to 10 36 erg. Using these new data combined with the results from the data with 30-min sampling, we found the occurrence frequency (dN/dE) of superflares as a function of flare energy (E) shows the power-law distribution (dN/dE ∝ E −α ) with α = 1.5 for 10 33 < E < 10 36 erg. The upper limit of energy released by superflares is basically comparable to a fraction of the magnetic energy stored near starspots which is estimated from the amplitude of brightness variations. We also found that the duration of superflares (τ ) increases with the flare energy (E) as τ ∝ E 0.39±0.03 . This can be explained if we assume the time-scale of flares is determined by the Alfvén time.

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Lectures on Solar Physics

Cited by 6 publications

References 318 publications

The GOES-R EUVS model for EUV irradiance variability

The GOES-R EUVS model for EUV irradiance variability

Generalized Bohm sheath criterion in dusty plasma of space environment

Statistical properties of superflares on solar-type stars based on the Kepler 1-min cadence data

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