The table below shows the most common keywords used by the author. The letters in brackets after some keywords denote if the keyword corresponds to Solar Physics (S) or Heliospheric Physics (H).
| Keyword
| Occurrences
|
|---|
| Sunspots [S]
| 48
|
| Astrophysics - Solar And Stellar Astrophysics [S]
| 48
|
| Solar Activity
| 40
|
| Solar Cycle
| 37
|
| Sunspot Number
| 25
|
| Observations
| 18
|
| Statistics
| 16
|
| Sun: Activity
| 15
|
| The Sun [S]
| 9
|
| Maunder Minimum
| 8
|
| Physics - History And Philosophy Of Physics
| 7
|
| Historical Records
| 6
|
| Sun: General
| 6
|
| Physics - Space Physics [H]
| 5
|
| Physics - Atmospheric And Oceanic Physics
| 5
|
| Group Sunspot
| 4
|
| Sunspot Area
| 4
|
| Aurora Borealis
| 4
|
| History And Philosophy Of Astronomy
| 3
|
| Solar Phys
| 3
|
| Solar Observations
| 3
|
| Group Sunspot Number
| 3
|
| Sun: Filaments [S]
| 3
|
| Sunspot Cycle
| 3
|
| Geomagnetic Storm
| 3
|
| Astrophysics - Earth And Planetary Astrophysics
| 3
|
| Astronomy Databases
| 3
|
| Astronomical Data Bases: Miscellaneous
| 3
|
| Machine Learning
| 3
|
| Sunspot
| 3
|
| Time Series Analysis
| 3
|
| Catalogs
| 3
|
| Aurora
| 2
|
| Sunspot Catalogue
| 2
|
| Fourier Transform
| 2
|
| 18th Century
| 2
|
| Sun: Flares [S]
| 2
|
| Cortie Classification
| 2
|
| Hydrology: Precipitation (3354)
| 2
|
| Solar Radius
| 2
|
| Rotation
| 2
|
| 19th Century
| 2
|
| Late 18th Century
| 2
|
| Solar Rotation
| 2
|
| Morphological Classification Of Sunspots
| 2
|
| Sunspot Groups
| 2
|
| Time Series
| 2
|
| Solar-terrestrial Relations
| 2
|
| Sun: Sunspots
| 2
|
| Iberian Peninsula
| 2
|
| Atmospheric Processes: Climate Change And Variability (1616
| 2
|
| Solar Rotation Rate
| 2
|
| 4513)
| 2
|
| Rgo Classification
| 1
|
| Quantitative Biology - Populations And Evolution
| 1
|
| Precipitable Water
| 1
|
| Portugal
| 1
|
| Physics - Popular Physics
| 1
|
| Physics - Geophysics
| 1
|
| Penumbrae
| 1
|
| Past Climate Conditions
| 1
|
| Parma
| 1
|
| Padua
| 1
|
| North Atlantic Oscillation
| 1
|
| Natural Hazard
| 1
|
| Nao
| 1
|
| Mexico City
| 1
|
| Methods: Data Analysis
| 1
|
| Meteors
| 1
|
| Meteorological
| 1
|
| Meteorites
| 1
|
| Medieval Climate Anomaly
| 1
|
| Main Interest
| 1
|
| Madrid Astronomical Observatory
| 1
|
| Lunar Eclipses
| 1
|
| Literature
| 1
|
| Linear Relation
| 1
|
| Large Scale Cosmic-ray Correlations
| 1
|
| Large Change
| 1
|
| Landslides
| 1
|
| Interplanetary Magnetic Field
| 1
|
| International Sunspot Numbers
| 1
|
| Infrared Thermometer
| 1
|
| Hydrology: Hydroclimatology
| 1
|
| History Of Astronomy
| 1
|
| Historical Sunspot Drawings
| 1
|
| Historical Space Weather Event
| 1
|
| Historical Observations
| 1
|
| Heritage
| 1
|
| Hemispheric Sunspot Number
| 1
|
| Heliophysical Series
| 1
|
| Heliographic Coordinates
| 1
|
| Group Numbers
| 1
|
| Good Level
| 1
|
| Global Solar Radiation
| 1
|
| Global Navigation Satellite Systems
| 1
|
| Global Change: Climate Variability (1635
| 1
|
| Glacier
| 1
|
| Geomagnetic-storm
| 1
|
| Geomagnetic Latitude
| 1
|
| Geomagnetic Fields
| 1
|
| Frequency Rainfall Indices
| 1
|
| Fourier
| 1
|
| Floods
| 1
|
| Fast Fourier Transform
| 1
|
| Extreme Precipitation
| 1
|
| Extreme Events
| 1
|
| Extensive Air Showers
| 1
|
| Educational Aids
| 1
|
| Eclipse
| 1
|
| Early Instrumental Records
| 1
|
| Early Dimming
| 1
|
| Early Brightening
| 1
|
| Dynamo
| 1
|
| Differential Rotation
| 1
|
| Demonstration Experiments And Apparatus
| 1
|
| Data Series
| 1
|
| Daily Precipitation
| 1
|
| Cycle-averaged Tilt Angle
| 1
|
| Cycle Length
| 1
|
| Cultural Astronomy
| 1
|
| Credo Collaboration
| 1
|
| Covid-19 Disease
| 1
|
| Cosmic-ray Ensembles
| 1
|
| Cosmic Rays
| 1
|
| Communication Networks
| 1
|
| Cloud Cover
| 1
|
| Climatic System Variability
| 1
|
| Bolides
| 1
|
| Aula
| 1
|
| Atmospheric Processes: Data Assimilation
| 1
|
| Atmospheric Processes: Climatology (1616
| 1
|
| Atmospheric Effects
| 1
|
| Atmospheric Composition And Structure: Radiation: Transmission And Scattering
| 1
|
| Atmospheric Composition And Structure: Middle Atmosphere: Constituent Transport And Chemistry (3334)
| 1
|
| Atmospheric Composition And Structure: Evolution Of The Atmosphere (1610
| 1
|
| Atmospheric Circulation
| 1
|
| Astrophysics - Instrumentation And Methods For Astrophysics
| 1
|
| Astrophysics - High Energy Astrophysical Phenomena [S]
| 1
|
| Astrophysics
| 1
|
| Astronomical Databases: Miscellaneous
| 1
|
| Area Measurement
| 1
|
| Angelo Secchi
| 1
|
| Analyse Description
| 1
|
| Almada
| 1
|
| Air Humidity
| 1
|
| Activity Index
| 1
|
| Active Region
| 1
|
| Acoustic Noise Measurement
| 1
|
| Acoustic Noise
| 1
|
| 96.60.qd
| 1
|
| 96.60.qc
| 1
|
| 96.60.-j
| 1
|
| 96.50.wx
| 1
|
| 8408)
| 1
|
| 8125)
| 1
|
| 45.40.cc
| 1
|
| 1918 Spanish Flu
| 1
|
| 01.50.-i
| 1
|
| Zurich Classification
| 1
|
| Work Analyse
| 1
|
| White-light Flares
| 1
|
| Water Vapor
| 1
|
| Waldmeier's Discontinuity
| 1
|
| W.c. Bond
| 1
|
| Visual Observation
| 1
|
| Velocity
| 1
|
| Validation
| 1
|
| Umbra
| 1
|
| Ultraviolet Irradiance
| 1
|
| Trends
| 1
|
| Total Ozone
| 1
|
| Total Irradiance
| 1
|
| Time And Frequency
| 1
|
| Tilt Angles
| 1
|
| The Shape Parameter Obtained From The Fit Of The Generalized Pareto Distribution To The Extreme Va
| 1
|
| The Results Show That Previous Registered Extreme Storms Could Be Considered As The
| 1
|
| The Estimation Of This Limit For The Extreme Values Lead To 850 Nt As The Highest Expected
| 1
|
| The 1903 Storm
| 1
|
| Synodic Solar Rotation
| 1
|
| Sunspot-number Series
| 1
|
| Sunspot Observations
| 1
|
| Sunspot Observation
| 1
|
| Sunspot Areas
| 1
|
| Sunshine Duration
| 1
|
| Sun: Spots
| 1
|
| Sun: Coronal Mass Ejections
| 1
|
| Sun: Corona [S]
| 1
|
| Sun Spots Solar Cycles
| 1
|
| Structure
| 1
|
| Statistical Analysis
| 1
|
| Spanish Observations
| 1
|
| Spain
| 1
|
| Space Weather Event
| 1
|
| Space Climate
| 1
|
| Solar-terrestrial Interactions
| 1
|
| Solar Surface
| 1
|
| Solar Storm
| 1
|
| Solar Physics [S]
| 1
|
| Solar Observation
| 1
|
| Solar Hemisphere
| 1
|
| Solar Cycles
| 1
|
| Solar Cycle Variations
| 1
|
| Solar Cycle Length
| 1
|
| Solar Cycle 9
| 1
|
| Solar Cycle 8
| 1
|
| Solar Activity Prediction
| 1
|
| Solar Activity In The Past
| 1
|
| Rotation Rate
| 1
|
| Road Traffic
| 1
|
| Rigid Body And Gyroscope Motion
| 1
|
| 17th Century
| 1
|
| 06.30.ft
| 1
|
| 01.50.my
| 1
|
| Zürich Classification
| 1
|