Building a new space weather facility at the National Observatory of Athens

Kontogiannis, Ioannis; Belehaki, A.; Tsiropoula, G.; Tsagouri, I.; Anastasiadis, A.; Papaioannou, Athanasios

doi:10.1016/j.asr.2015.10.028

Cited by 3 publications

(2 citation statements)

References 43 publications

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“…The enhanced X-ray and EUV emission affect immediately the electron density in a range of ionospheric altitudes, disrupting radio communications, while the subsequent expansion of the atmosphere increases the drag on low-altitude satellites. The direct electromagnetic emission and the energetic particles, which are accelerated in situ and/or by CME fronts are hazardous to space-borne instrumentation and crew and can severely damage infrastructure (spaceborne and ground-based), disrupting communications, navigation systems, and power grids [see e.g., Tsurutani et al, 2009, Kontogiannis et al, 2016, Balasis et al, 2019, Daglis et al, 2019.…”

Section: Introductionmentioning

confidence: 99%

The characteristics of flare- and CME-productive solar active regions

Kontogiannis¹

2023

Advances in Space Research

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Section: Introductionmentioning

confidence: 99%

The characteristics of flare- and CME-productive solar active regions

Kontogiannis¹

2023

Advances in Space Research

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“…The solar origin and the acceleration mechanisms leading to SEP events is still under debate. However, there seems to be a general consensus that the occurrence (or not) of a CME controls the derived probability of the SEP occurrence (Dierckxsens et al, 2015;Kontogiannis et al, 2016). Regular CME monitoring by the Large Angle and Spectrometric Coronograph (LASCO; Brueckner et al, 1995) onboard the Solar and Heliospheric Observatory (SoHO) since 1996 has shown that almost all recorded SEP events during the SoHO era are associated with both CMEs and SFs with only a few events lacking the presence of one or the other (Kurt et al, 2004;Cane et al, 2010;Dierckxsens et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Nowcasting of Solar Energetic Particle Events using near real-time Coronal Mass Ejection characteristics in the framework of the FORSPEF tool

Papaioannou

Anastasiadis

Sandberg

et al. 2018

J. Space Weather Space Clim.

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In this work the derived occurrence probability of solar energetic particle (SEP) events (i.e. proton events measured at Earth’s position) and their peak fluxes and total fluences depending on coronal mass ejection (CME) parameters, i.e. linear speed (V) and the angular width (AW) are presented. A new SEP catalogue with associated CME data from 1997 to 2013 is utilized. It is found that the SEP probability strongly depends on the CME speed and the angular width as follows: The highest association (72.70%) is obtained for the full halo CMEs with V ≥ 1500 km s−1 and the lowest association (0.7%) is found for the non halo CMEs with 400 km s−1 ≤ V ≤ 1000 km s−1. The SEP occurrence probabilities are different as much as 26 times according to the CME speed (V), comparing fast versus slow CMEs and 44 times according to the AW, comparing halo to non halo CMEs. Furthermore, linear regressions of the proton peak flux and integral fluence at several integral energy channels (E > 10 MeV, E > 30 MeV, E > 60 MeV, E > 100 MeV) were obtained. Our results, were used to build a module of an operational forecasting tool (i.e. FORecasting Solar Particle Events and Flares – FORSPEF, http://tromos.space.noa.gr/forspef/). This module performs nowcasting (short term forecasting) of SEP events using near real-time CME identifications obtained from CACTus (http://sidc.oma.be/cactus/). The outputs offered by the operational module of the tool to the end user (textural, pictorial, archived data) are presented. Finally, the validation of the system, in terms of archived data is described, in terms of categorical scores (Probability of Detection – POD and a False Alarm Rate – FAR).

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Solar Activity from 2006 to 2014 and Short-term Forecasts of Solar Proton Events Using the ESPERTA Model

Alberti

Laurenza

Cliver

et al. 2017

ApJ

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To evaluate the solar energetic proton (SEP) forecast model of Laurenza et al., here termed ESPERTA, we computed the input parameters (soft X-ray (SXR) fluence and ∼1 MHz radio fluence) for all ≥M2 SXR flares from 2006 to 2014. This database is outside the 1995–2005 interval on which ESPERTA was developed. To assess the difference in the general level of activity between these two intervals, we compared the occurrence frequencies of SXR flares and SEP events for the first six years of cycles 23 (1996 September–2002 September) and 24 (2008 December–2014 December). We found a reduction of SXR flares and SEP events of 40% and 46%, respectively, in the latter period. Moreover, the numbers of ≥M2 flares with high values of SXR and ∼1 MHz fluences (>0.1 J m−2 and >6 × 105 sfu × minute, respectively) are both reduced by ∼30%. A somewhat larger percentage decrease of these two parameters (∼40% versus ∼30%) is obtained for the 2006–2014 interval in comparison with 1995–2005. Despite these differences, ESPERTA performance was comparable for the two intervals. For the 2006–2014 interval, ESPERTA had a probability of detection (POD) of 59% (19/32) and a false alarm rate (FAR) of 30% (8/27), versus a POD = 63% (47/75) and an FAR = 42% (34/81) for the original 1995–2005 data set. In addition, for the 2006–2014 interval the median (average) warning time was estimated to be ∼2 hr (∼7 hr), versus ∼6 hr (∼9 hr), for the 1995–2005 data set.

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Building a new space weather facility at the National Observatory of Athens

Cited by 3 publications

References 43 publications

The characteristics of flare- and CME-productive solar active regions

The characteristics of flare- and CME-productive solar active regions

Nowcasting of Solar Energetic Particle Events using near real-time Coronal Mass Ejection characteristics in the framework of the FORSPEF tool

Solar Activity from 2006 to 2014 and Short-term Forecasts of Solar Proton Events Using the ESPERTA Model

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