A5021978997- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Geomagnetism and Paleomagnetism Studies
- Earthquake Detection and Analysis
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Gas Dynamics and Kinetic Theory
- Nuclear reactor physics and engineering
- Heat Transfer and Optimization
- Navier-Stokes equation solutions
- Nuclear Engineering Thermal-Hydraulics
- Geophysics and Sensor Technology
- Differential Equations and Numerical Methods
- Solidification and crystal growth phenomena
- Geophysics and Gravity Measurements
- Geological Modeling and Analysis
- Spacecraft and Cryogenic Technologies
- Material Dynamics and Properties
- Seismology and Earthquake Studies
- Spacecraft Design and Technology
- Space exploration and regulation
- Thermoelastic and Magnetoelastic Phenomena
- Atmospheric Ozone and Climate
- Metallurgical Processes and Thermodynamics
- Differential Equations and Boundary Problems
Universidad de Alcalá
2009-2018
On 15 May 2005, a huge interplanetary coronal mass ejection (ICME) was observed near Earth. It triggered one of the most intense geomagnetic storms solar cycle 23 (Dst peak = -263 nT). This structure has been associated with two-ribbon flare, filament eruption, and originating in active region 10759 (NOAA number). We analyze here sequence events, from wind measurements (at 1 AU) back to Sun, understand origin evolution this geoeffective ICME. From detailed observational study situ magnetic...
Extreme geomagnetic storms are considered as one of the major natural hazards for technology-dependent society. Geomagnetic field disturbances can disrupt operation critical infrastructures relying on space-based assets, and also result in terrestrial effects, such Quebec electrical disruption 1989. Forecasting potential is a matter high priority, but considering large flares only criterion early-warning systems has demonstrated to release amount false alarms misses. Moreover, quantification...
In September 1859 the Colaba observatory measured most extreme geomagnetic disturbance ever recorded at low latitudes related to solar activity: Carrington storm. This paper describes a case with profile extraordinarily similar of event Colaba: on 29 October 2003 Tihany magnetic in Hungary. The analysis H-field different locations during "Carrington-like" leads re-interpretation event. major conclusions are following: (a) global Dst or SYM-H, as indices based averaging, missed largest and...
The probability for a halo coronal mass ejection (CME) to be geoeffective is assumed higher the closer CME launch site located solar central meridian. However, events far from meridian may produce severe geomagnetic storms, like case in April 2000. In this work, we study possible geoeffectiveness of full CMEs with source region situated at limb. For task, select all limb (LFH) that occurred during cycle 23, and search signatures between 1 5 days after first appearance each LASCO C2 field...
Abstract. We analyze two magnetic clouds (MCs) observed in different points of the heliosphere. The main aim present study is to provide a link between aspects this phenomenon, starting with information on origins MCs at Sun and following by analysis in-situ observations 1 AU Ulysses. candidate source regions were identified SOHO/EIT SOHO/MDI observations. They correlated H-α images that obtained from ground-based observatories. Hints internal field configuration associated coronal mass...
What one commonly considers for reproducing the recovery phase of magnetosphere, as seen by Dst index, is exponential function. However, magnetosphere recovers faster in first hours than late phase. The early steepness followed smoothness magnetospheric response a feature that leads to proposal hyperbolic decay function reproduce instead A superposed epoch analysis phases intense storms from 1963 2003 was performed, categorizing their intensity into five subsets. reproduces experimental data...
The Carrington storm in 1859 is considered to be the major geomagnetic disturbance related solar activity. In a recent paper, Cid et al. (2015) discovered case with profile extraordinarily similar of event at Colaba, but mid-latitude observatory, leading reinterpretation event. Based on those results, this paper performs deep search for other "Carrington-like" events and analyses interplanetary observations ground disturbances which emerged from systematic analysis. results study based two...
Forecasting potential geoeffectiveness of solar disturbances (in particular, frontside full halo coronal mass ejections) is important for various practical purposes, e.g., satellite operations, radio communications, global positioning system applications, power grid, and pipeline maintenance. We analyze three ejections (CMEs) that occurred in the year 2000 (close to activity maximum cycle 23), together with associated heliospheric phenomena as well their impact on Earth's magnetosphere. Even...
The recovery phase of the largest storms ever recorded has been studied. These events provide an extraordinary opportunity for two goals: (1) to validate hyperbolic model by Aguado et al. [2010] after disturbances as severe Carrington event, or that related Hydro-Quebec blackout in March 1989, and (2) check whether linear relationship between time intensity storm still complies. Our results reveal high accuracy decay function reproduce magnetosphere extreme storm. Moreover, characteristic...
The space weather discipline involves different physical scenarios, which are characterised by very conditions, ranging from the Sun to terrestrial magnetosphere and ionosphere. Thanks great modelling effort made during last years, a few Sun-to-ionosphere/thermosphere physics-based numerical codes have been developed. However, success of prediction is still far achieving desirable results much more progress needed. Some aspects involved in this concern both technical (developing validating...
Abstract. Southward interplanetary magnetic fields are considered traces of geoeffectiveness since they a main agent reconnection solar wind and magnetosphere. The first part this work revises the ability to forecast intense geomagnetic activity using different procedures available in literature. study shows that current methods do not succeed making confident predictions. This fact led us develop new forecasting procedure, which provides trustworthy results predicting large variations Dst...
Abstract Midlatitude locations are unique regions exposed to both geomagnetic storm and substorm effects, which may be superposed on specific events imposing an extra handicap for the analysis identification of sources triggers. We study space weather effects at midlatitude location Iberian Peninsula St. Patrick's day in 2013 2015. have been able identify separate ground magnetometer data from San Pablo‐Toledo observatory during time revealing important contributions Substorm Current Wedge...
Abstract. Geomagnetic storms, as part of the Sun-Earth relations, are continuously monitored with different indices and scales. These usually have some associated scale thresholds to quantify severity or risk geomagnetic disturbances. However, most usual arbitrarily chosen. In this work we aim range through a new method. based on statistical distribution fitting. We used indices, Dst, SYM-H, Kp, since they relevant for space weather purposes. The first two been discriminated between their...
Abstract. Geomagnetic storms, as part of the Sun-Earth relations, are continuously monitored with different indices and scales. These have some scale thresholds to quantify severity or risk geomagnetic disturbances. However, most usual arbitrarily chosen. In this work we aim range through a new method. based on statistical distribution fitting. The data used from regional real-time high-cadence index, named LDiñ, its derivative, LCiñ. We considered negative significant for disturbances;...
[1] Echer et al. [2008] studied the interplanetary causes of superintense (Dst ≤ −250 nT) geomagnetic storms that occurred during solar cycle 23. From a sample 11 events (listed in Table 1 [2008], hereinafter referred to as Table), they found 1/3 superstorms are caused by MC (magnetic cloud) fields, combination SH (sheath) + fields and fields. these results, joint study Tsurutani [1992] for five greatest period 1971–1986, concluded "only sheath seems be important development superstorms"....
Here we report evidence of a large solar filament eruption on 2013, September 29. This smooth eruption, which passed without any previous flare, formed after two-ribbon flare and coronal mass ejection towards Earth. The generated moderate geomagnetic storm October 2 with very serious localized effects. whole event unnoticed to flare-warning systems. We have conducted multi-wavelength analyses the Solar Dynamics Observatory through Atmospheric Imaging Assembly (AIA) Helioseismic Magnetic...
Explicit self-similar solutions are systematically obtained for a nonlinear diffusion equation with coefficient that depends exponentially on the transported magnitude (D(u)=K1ealpha u), some boundary conditions associated parameter lambda of transformation group. Group elements under which Hamiltonian this physical system remains invariant enable one to find new magnitudes remain each specific value in turn. This allows properties be established. The sign alpha limits possibility obtaining...
The Spanish Space Weather Service SeNMEs, \url{www.senmes.es}, is a portal created by the SRG-SW of Universidad de Alcalá, Spain, to meet societal needs near real-time space weather services. This webpage-portal divided in different sections fulfill users about effects: radio blackouts, solar energetic particle events, geomagnetic storms and presence geomagnetically induced currents. In less than one year activity, this service has released daily report concerning current status...