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helioviewer.org

https://helioviewer.org· First analyzed 29 May 2026· Updated 29 May 2026
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helioviewer.org
Desktop screenshot of helioviewer.org
Mobile screenshot of helioviewer.org
Mobile

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Hosting Provider

National Aeronautics and Space Administration

IP Address

129.164.142.34

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Ashburn, United States

ASN

AS270

Organization

National Aeronautics and Space Administration

Server

Apache

Nameservers

ns-1451.awsdns-53.org.ns-2011.awsdns-59.co.uk.ns-970.awsdns-57.net.ns-143.awsdns-17.com.

Performance

94

Core Web Vitals

Weight

First Contentful Paint
1.2 s10%
Speed Index
1.5 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
3.2 MB
68 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
National Aeronautics and Space Administration

Technology Stack

8 Technologies Detected

Libraries

2
jQueryv3.6.0
jQuery UI

Analytics

2
Google Analytics
Google Analytics 4

Other

1
Highcharts

CSS Frameworks

1
Tailwind CSS

Icon Libraries

1
Font Awesome

Web Servers

1
Apache

SEO Analysis

D57/100
14
9
0
Meta Tags10/15
Content11/12
Headings4/8
Technical11/21
E-E-A-T0/7
Images4/7
Links4/5
URL5/5
Social2/5
Freshness0/4
Mobile3/4
Indexability3/3
H
helioviewer.orghelioviewer.org

Helioviewer.org - Solar and heliospheric image visualization tool

Helioviewer.org - Solar and heliospheric image visualization tool

Title Length65 chars

Recommended: 50-60 chars (~377px / 580px)

Description Length65 chars

Recommended: 120-160 chars

Issues (0)

    9 issues found

    Upgrade to view details

    Local SEO

    Local Search Readiness

    8/100
    Poor
    3 12 2

    This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

    Sponsored

    AI & LLM Readiness

    F38/100
    Bot Access
    20/25
    Machine Read.
    10/25
    Schema Data
    0/25
    Citation
    8/25

    AI Bot Access

    14/14 accessible
    AI Search
    OAI-SearchBot
    PerplexityBot
    Claude-SearchBot
    Gemini-Deep-Research
    DuckAssistBot
    Training
    GPTBot
    ClaudeBot
    Google-Extended
    Meta-ExternalAgent
    Bytespiderinfo
    Amazonbot
    Applebot-Extended
    CCBotinfo
    Fetch
    ChatGPT-User

    Machine Readability

    llms.txt
    llms-full.txt
    Semantic HTML
    Heading Hierarchy
    Text ratio:4%
    Words:1,015
    Token eff.:Optimal

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary15w
    Descriptive Headings
    Canonical URL
    Open Graph3/3
    Twitter Card0/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (11)
    AI readiness recommendation preview...
    Upgrade to view recommendations

    Sponsored

    Accessibility

    WCAG 2.1 Compliance

    Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.
    C
    63/100
    9
    Passed
    6
    Critical
    2
    Warnings
    Images & Alt Text
    15/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    12/20
    Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
    Forms & Inputs
    7/15
    Verifies form fields have labels, error messages are clear, and inputs are properly associated.
    Color & Contrast
    14/15
    Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.
    Keyboard & Focus
    9/15
    Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
    ARIA & Roles
    6/15
    Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
    3 recommendations
    • •Accessibility recommendation preview...
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    Carbon Footprint

    SWDM v4 · Eco-Score

    Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.
    2/100
    F
    405 mg
    CO₂e / view
    3.2 MB
    Page Weight
    30%
    Cleaner Than
    New Visitor
    463 mg
    vs
    Returning (cached)
    231 mg
    Annual (10K/mo)
    48.6 kg
    Emission Segments
    Data Center
    90 mg
    Network
    97 mg
    Device
    217 mg
    Resource Breakdown
    JavaScript
    2.8 MB
    Images
    117.6 KB
    CSS
    269.9 KB
    HTML
    66.7 KB
    Green Hosting Not Verified
    National Aeronautics and Space Administration
    8 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    D

    Security Score

    46%Poor
    Interactive

    HTTPS

    No WAF

    57d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Let's Encrypt

    Key Algorithm

    RSA (4096 bit)

    Signature

    SHA-256 with RSA

    TLS Version

    TLSv1.2

    HTTP Protocol

    HTTP/1.1

    Valid From

    27.04.2026

    Valid Until

    26.07.2026

    Subject Alternative Names (7)

    api.helioviewer.orggs671-suske.ndc.nasa.govhelioviewer.orgjpip.helioviewer.orgk12.helioviewer.orgstudent.helioviewer.orgwww.helioviewer.org

    SHA-256 Fingerprint

    EC:C9:7B:7F:F9:50:0E:76:EB:FA:35:05:26:06:D5:EB:09:15:82:44...

    Top Recommendations

    Security recommendation preview

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    Upgrade to view header details

    HTTP Headers

    Developer Console

    access-control-allow-origin
    *
    connection
    Keep-Alive
    content-type
    text/html; charset=UTF-8
    date
    Fri, 29 May 2026 19:53:13 GMT
    keep-alive
    timeout=5, max=100
    server
    Apache
    Good Warning Issue

    Email Infrastructure

    Google Workspace

    Score

    20

    SPF
    DKIM
    DMARC

    MX Records (5)

    aspmx.l.google.com
    aspmx2.googlemail.com
    alt1.aspmx.l.google.com
    aspmx3.googlemail.com

    +1 more

    Domain Information

    helioviewer.org

    Domain Age
    18y 4m

    Created

    11.01.2008

    Expires

    11.01.2029

    Last Updated

    06.05.2026

    Registrar

    Amazon Registrar, Inc.

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookie Consent Banner
    Privacy Policy
    Terms of Service

    GDPR Indicators

    Privacy policy page linked

    Mobile Compatibility

    Viewport & Responsive Test

    Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.
    C
    64/100
    Mobile Friendly1 breakpoint
    Viewport Meta
    The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.
    Responsive Design
    Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.
    Touch Icons
    Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.
    Readable Font Size
    Base font size should be at least 16px on mobile to ensure text is readable without zooming.
    Relative Units
    Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.
    No H-Scroll Risk
    No elements wider than the viewport that would cause horizontal scrolling on mobile devices.
    Tap Targets OK
    Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.
    No Fixed Widths
    No elements with fixed pixel widths that could overflow on smaller screens and break the layout.
    Viewport
    width=device-width, initial-scale=1
    2 recommendations
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    Helvetica Neue + Arial

    WCAG Fail
    54/100
    Readability
    /30
    14/30

    11px · LH 1.23

    Hierarchy
    /20
    14/20

    2.36x ratio · ✓ H1→H6

    WCAG
    /25
    13/25

    1:1 min contrast

    Performance
    /25
    13/25

    System fonts

    Heading Font

    Helvetica Neue

    Sans26px

    Body Font

    Arial

    Sans11px

    Contrast Ratio

    1:1

    13 issues

    Reading Comfort

    Dual Sans-Serif

    center aligned
    26px
    h1
    11px
    p

    ❌ Critical: 11px body text is too small. Minimum 14px, recommend 16px+.

    ⚠️ Tight line spacing (1.23). Increase to 1.4–1.6 for better readability.

    ❌ Low contrast: 13 elements fail WCAG AA (min 1.0:1). Increase text/background contrast.

    ✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

    ✅ Strong hierarchy: Headlines are 2.4x larger than body text.

    ✅ System fonts: Zero font loading delay — best possible LCP impact.

    Color Palette

    9 unique colors
    14.41:1 AAA Dark
    #000000
    Background· 95.6%
    #d1d7d7
    Other· 0.3%

    Business & Marketing Stack

    1 Tools Detected

    Growing

    Behavior Analytics

    1
    Google AnalyticsFree

    User behavior and product analytics

    1

    Categories

    1

    Total Tools

    0

    Enterprise

    0

    Mid-Market

    Assessment: Growing marketing technology adoption

    Sponsored

    Scripts & Styles

    30 Resources

    20
    Scripts
    10
    Styles
    0
    Async
    0
    Defer

    Top Script Sources

    local(17)dap.digitalgov.gov(2)googletagmanager.com(1)

    Website Identity

    helioviewer.org

    HelioViewerDevelopment@nasa.onmicrosoft.com;
    18 years old
    Location detected: 🇺🇸 United Statesvia ip
    Amazon Registrar, Inc.📧 Google Workspaceen

    Social Profiles

    GitHub

    Sponsored

    Last analyzed: 29 May 2026 at 19:53

    Historical Analysis & Change Tracking